---
_id: '64030'
abstract:
- lang: eng
text: A novel, efficient approach for the functionalization of microcrystalline
cellulose (MCC) is presented. The as-obtained material allows the immobilization
of chiral dirhodium catalysts preserving their enantioselectivity in asymmetric
cyclopropanation reactions. As model, microcrystalline cellulose is modified with
a polyethylene glycol derived linker, and Rh-2(S-DOSP)(4) is grafted on the material
to produce a heterogeneous catalyst. SEM images at different stages of the immobilization
show an unchanging uniform morphology, providing constantly good separation characteristics.
The modification of the cellulose material with the polyethylene derived linker
and the immobilization process are monitored using DNP enhanced H-1 -{\textgreater}
C-13 CP MAS NMR, quantitative F-19 MAS NMR, TGA and ICP-OES analysis, confirming
the success of the immobilization as well as the stability of bonds between the
used linker molecule and the cellulose material. Finally, the evaluation of the
produced catalyst is demonstrated in the asymmetric cyclopropanation reaction
between styrene and methyl(E)-2-diazo-4-phenylbut-3-enoate showing excellent enantioselectivity
with an ee of nearly 90% over a wide temperature range as well as good recyclability
characteristics in four consecutive catalysis cycles.
author:
- first_name: L.
full_name: Roesler, L.
last_name: Roesler
- first_name: M. V.
full_name: Hoefler, M. V.
last_name: Hoefler
- first_name: H.
full_name: Breitzke, H.
last_name: Breitzke
- first_name: T.
full_name: Wissel, T.
last_name: Wissel
- first_name: K.
full_name: Herr, K.
last_name: Herr
- first_name: H.
full_name: Heise, H.
last_name: Heise
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: G.
full_name: Buntkowsky, G.
last_name: Buntkowsky
citation:
ama: Roesler L, Hoefler MV, Breitzke H, et al. Dirhodium complex immobilization
on modified cellulose for highly selective heterogeneous cyclopropanation reactions.
Cellulose. 2022;29(11):6283–6299. doi:10.1007/s10570-022-04654-y
apa: Roesler, L., Hoefler, M. V., Breitzke, H., Wissel, T., Herr, K., Heise, H.,
Gutmann, T., & Buntkowsky, G. (2022). Dirhodium complex immobilization on
modified cellulose for highly selective heterogeneous cyclopropanation reactions.
Cellulose, 29(11), 6283–6299. https://doi.org/10.1007/s10570-022-04654-y
bibtex: '@article{Roesler_Hoefler_Breitzke_Wissel_Herr_Heise_Gutmann_Buntkowsky_2022,
title={Dirhodium complex immobilization on modified cellulose for highly selective
heterogeneous cyclopropanation reactions}, volume={29}, DOI={10.1007/s10570-022-04654-y},
number={11}, journal={Cellulose}, author={Roesler, L. and Hoefler, M. V. and Breitzke,
H. and Wissel, T. and Herr, K. and Heise, H. and Gutmann, Torsten and Buntkowsky,
G.}, year={2022}, pages={6283–6299} }'
chicago: 'Roesler, L., M. V. Hoefler, H. Breitzke, T. Wissel, K. Herr, H. Heise,
Torsten Gutmann, and G. Buntkowsky. “Dirhodium Complex Immobilization on Modified
Cellulose for Highly Selective Heterogeneous Cyclopropanation Reactions.” Cellulose
29, no. 11 (2022): 6283–6299. https://doi.org/10.1007/s10570-022-04654-y.'
ieee: 'L. Roesler et al., “Dirhodium complex immobilization on modified cellulose
for highly selective heterogeneous cyclopropanation reactions,” Cellulose,
vol. 29, no. 11, pp. 6283–6299, 2022, doi: 10.1007/s10570-022-04654-y.'
mla: Roesler, L., et al. “Dirhodium Complex Immobilization on Modified Cellulose
for Highly Selective Heterogeneous Cyclopropanation Reactions.” Cellulose,
vol. 29, no. 11, 2022, pp. 6283–6299, doi:10.1007/s10570-022-04654-y.
short: L. Roesler, M.V. Hoefler, H. Breitzke, T. Wissel, K. Herr, H. Heise, T. Gutmann,
G. Buntkowsky, Cellulose 29 (2022) 6283–6299.
date_created: 2026-02-07T16:06:07Z
date_updated: 2026-02-17T16:13:54Z
doi: 10.1007/s10570-022-04654-y
extern: '1'
intvolume: ' 29'
issue: '11'
language:
- iso: eng
page: 6283–6299
publication: Cellulose
publication_identifier:
issn:
- 0969-0239
status: public
title: Dirhodium complex immobilization on modified cellulose for highly selective
heterogeneous cyclopropanation reactions
type: journal_article
user_id: '100715'
volume: 29
year: '2022'
...
---
_id: '63994'
abstract:
- lang: eng
text: Six cluster salts which consist of hexanuclear cluster anions [Nb6Cl12iX6a]2–
(X = Cl or Br) and protonated crown ether molecules (15-crown-5 (15cr5) and 12-crown-4
(12cr4)) or crown ether-stabilized oxonium cations as well as one compound consisting
of neutral cluster units, [Nb6Cl16(H2O)2]·4 dioxane, were synthesized in good
to high yields. The single-crystal X-ray structures of six of these compounds
were determined. The cation/anion ratios and the bond distances confirm in all
cases oxidized cluster cores with 14 cluster-based electrons. The cations of the
cluster salts are either sandwich-type dimers of the formula [(15cr5)H]22+ or
[(15cr5)(H3O)]22+ with the protons or oxonium ions embedded in between the crown
ether rings or monomeric units in the case of [(12cr4)H]+. 1H NMR investigations
show that the cluster salts are strong Brønsted acids. The fact that the cluster
core of [Nb6Cl16(H2O)2]·4 dioxane is oxidized but still carries water ligands
indicates that within the multi-step reaction sequence of the formation of the
cluster-supported acids, the oxidation step happens much faster than the ligand
exchange steps. Temperature-dependent 2H MAS NMR spectra of deuterium-exchanged
[(15cr5)H]2[Nb6Cl18]·2 CHCl3 are indicative of dynamic processes of the hydrogen-bonded
protons within the crown ether molecule. Six cluster salts which consist of hexanuclear
cluster anions [Nb6Cl12iX6a]2– (X = Cl or Br) and protonated crown ether molecules
(15-crown-5 (15cr5) and 12-crown-4 (12cr4)) or crown ether-stabilized oxonium
cations as well as one compound consisting of neutral cluster units, [Nb6Cl16(H2O)2]·4
dioxane, were synthesized in good to high yields. The single-crystal X-ray structures
of six of these compounds were determined. The cation/anion ratios and the bond
distances confirm in all cases oxidized cluster cores with 14 cluster-based electrons.
The cations of the cluster salts are either sandwich-type dimers of the formula
[(15cr5)H]22+ or [(15cr5)(H3O)]22+ with the protons or oxonium ions embedded in
between the crown ether rings or monomeric units in the case of [(12cr4)H]+. 1H
NMR investigations show that the cluster salts are strong Brønsted acids. The
fact that the cluster core of [Nb6Cl16(H2O)2]·4 dioxane is oxidized but still
carries water ligands indicates that within the multi-step reaction sequence of
the formation of the cluster-supported acids, the oxidation step happens much
faster than the ligand exchange steps. Temperature-dependent 2H MAS NMR spectra
of deuterium-exchanged [(15cr5)H]2[Nb6Cl18]·2 CHCl3 are indicative of dynamic
processes of the hydrogen-bonded protons within the crown ether molecule.
author:
- first_name: Jonas
full_name: Koenig, Jonas
last_name: Koenig
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: Gerd
full_name: Buntkowsky, Gerd
last_name: Buntkowsky
- first_name: Martin
full_name: Koeckerling, Martin
last_name: Koeckerling
citation:
ama: 'Koenig J, Gutmann T, Buntkowsky G, Koeckerling M. Strong Cluster-Supported
Brønsted Acids: Hexanuclear Niobium Cluster Compounds with Protonated Crown Ether
Cations: (Crown-H)2[Nb6Cl12iX6a] (X = Cl or Br) and the Intermediate [Nb6Cl16(H2O)2]·4
dioxane. Inorganic Chemistry. 2022;61(40):15983–15990.'
apa: 'Koenig, J., Gutmann, T., Buntkowsky, G., & Koeckerling, M. (2022). Strong
Cluster-Supported Brønsted Acids: Hexanuclear Niobium Cluster Compounds with
Protonated Crown Ether Cations: (Crown-H)2[Nb6Cl12iX6a] (X = Cl or Br) and the
Intermediate [Nb6Cl16(H2O)2]·4 dioxane. Inorganic Chemistry, 61(40),
15983–15990.'
bibtex: '@article{Koenig_Gutmann_Buntkowsky_Koeckerling_2022, title={Strong Cluster-Supported
Brønsted Acids: Hexanuclear Niobium Cluster Compounds with Protonated Crown Ether
Cations: (Crown-H)2[Nb6Cl12iX6a] (X = Cl or Br) and the Intermediate [Nb6Cl16(H2O)2]·4
dioxane}, volume={61}, number={40}, journal={Inorganic Chemistry}, publisher={American
Chemical Society}, author={Koenig, Jonas and Gutmann, Torsten and Buntkowsky,
Gerd and Koeckerling, Martin}, year={2022}, pages={15983–15990} }'
chicago: 'Koenig, Jonas, Torsten Gutmann, Gerd Buntkowsky, and Martin Koeckerling.
“Strong Cluster-Supported Brønsted Acids: Hexanuclear Niobium Cluster Compounds
with Protonated Crown Ether Cations: (Crown-H)2[Nb6Cl12iX6a] (X = Cl or Br) and
the Intermediate [Nb6Cl16(H2O)2]·4 Dioxane.” Inorganic Chemistry 61, no.
40 (2022): 15983–15990.'
ieee: 'J. Koenig, T. Gutmann, G. Buntkowsky, and M. Koeckerling, “Strong Cluster-Supported
Brønsted Acids: Hexanuclear Niobium Cluster Compounds with Protonated Crown Ether
Cations: (Crown-H)2[Nb6Cl12iX6a] (X = Cl or Br) and the Intermediate [Nb6Cl16(H2O)2]·4
dioxane,” Inorganic Chemistry, vol. 61, no. 40, pp. 15983–15990, 2022.'
mla: 'Koenig, Jonas, et al. “Strong Cluster-Supported Brønsted Acids: Hexanuclear
Niobium Cluster Compounds with Protonated Crown Ether Cations: (Crown-H)2[Nb6Cl12iX6a]
(X = Cl or Br) and the Intermediate [Nb6Cl16(H2O)2]·4 Dioxane.” Inorganic
Chemistry, vol. 61, no. 40, American Chemical Society, 2022, pp. 15983–15990.'
short: J. Koenig, T. Gutmann, G. Buntkowsky, M. Koeckerling, Inorganic Chemistry
61 (2022) 15983–15990.
date_created: 2026-02-07T15:48:14Z
date_updated: 2026-02-17T16:16:07Z
extern: '1'
intvolume: ' 61'
issue: '40'
language:
- iso: eng
page: 15983–15990
publication: Inorganic Chemistry
publisher: American Chemical Society
status: public
title: 'Strong Cluster-Supported Brønsted Acids: Hexanuclear Niobium Cluster Compounds
with Protonated Crown Ether Cations: (Crown-H)2[Nb6Cl12iX6a] (X = Cl or Br) and
the Intermediate [Nb6Cl16(H2O)2]·4 dioxane'
type: journal_article
user_id: '100715'
volume: 61
year: '2022'
...
---
_id: '63997'
abstract:
- lang: eng
text: Abstract Herein we report the mechanochemical Friedel-Crafts alkylation of
1,3,5-triphenylbenzene (TPB) with two organochloride cross-linking agents, dichloromethane
(DCM) and chloroform (CHCl3), respectively. During a thorough milling parameter
evaluation, the DCM-linked polymers were found to be flexible and extremely sensitive
toward parameter changes, which even enables the synthesis of a polymer with a
SSABET of 1670 m2/g, on par with the solution-based reference. Contrary, CHCl3-linked
polymers are exhibiting a rigid structure, with a high porosity that is widely
unaffected by parameter changes. As a result, a polymer with a SSABET of 1280
m2/g could be generated in as little as 30 minutes, outperforming the reported
literature analogue in terms of synthesis time and SSABET. To underline the environmental
benefits of our fast and solvent-free synthesis approach, the green metrics are
discussed, revealing an enhancement of the mass intensity, mass productivity and
the E-factor, as well as of synthesis time and the work-up in comparison to the
classical synthesis. Therefore, the mechanochemical polymerization is presented
as a versatile tool, enabling the generation of highly porous polymers within
short reaction times, with a minimal use of chlorinated cross-linker and with
the possibility of a post polymerization modification.
author:
- first_name: Annika
full_name: Krusenbaum, Annika
last_name: Krusenbaum
- first_name: Jonathan
full_name: Geisler, Jonathan
last_name: Geisler
- first_name: Fabien Joel Leon
full_name: Kraus, Fabien Joel Leon
last_name: Kraus
- first_name: Sven
full_name: Grätz, Sven
last_name: Grätz
- first_name: Mark Valentin
full_name: Höfler, Mark Valentin
last_name: Höfler
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: Lars
full_name: Borchardt, Lars
last_name: Borchardt
citation:
ama: Krusenbaum A, Geisler J, Kraus FJL, et al. The mechanochemical Friedel-Crafts
polymerization as a solvent-free cross-linking approach toward microporous polymers.
Journal of Polymer Science. 2022;60(1):62–71. doi:10.1002/pol.20210606
apa: Krusenbaum, A., Geisler, J., Kraus, F. J. L., Grätz, S., Höfler, M. V., Gutmann,
T., & Borchardt, L. (2022). The mechanochemical Friedel-Crafts polymerization
as a solvent-free cross-linking approach toward microporous polymers. Journal
of Polymer Science, 60(1), 62–71. https://doi.org/10.1002/pol.20210606
bibtex: '@article{Krusenbaum_Geisler_Kraus_Grätz_Höfler_Gutmann_Borchardt_2022,
title={The mechanochemical Friedel-Crafts polymerization as a solvent-free cross-linking
approach toward microporous polymers}, volume={60}, DOI={10.1002/pol.20210606},
number={1}, journal={Journal of Polymer Science}, author={Krusenbaum, Annika and
Geisler, Jonathan and Kraus, Fabien Joel Leon and Grätz, Sven and Höfler, Mark
Valentin and Gutmann, Torsten and Borchardt, Lars}, year={2022}, pages={62–71}
}'
chicago: 'Krusenbaum, Annika, Jonathan Geisler, Fabien Joel Leon Kraus, Sven Grätz,
Mark Valentin Höfler, Torsten Gutmann, and Lars Borchardt. “The Mechanochemical
Friedel-Crafts Polymerization as a Solvent-Free Cross-Linking Approach toward
Microporous Polymers.” Journal of Polymer Science 60, no. 1 (2022): 62–71.
https://doi.org/10.1002/pol.20210606.'
ieee: 'A. Krusenbaum et al., “The mechanochemical Friedel-Crafts polymerization
as a solvent-free cross-linking approach toward microporous polymers,” Journal
of Polymer Science, vol. 60, no. 1, pp. 62–71, 2022, doi: 10.1002/pol.20210606.'
mla: Krusenbaum, Annika, et al. “The Mechanochemical Friedel-Crafts Polymerization
as a Solvent-Free Cross-Linking Approach toward Microporous Polymers.” Journal
of Polymer Science, vol. 60, no. 1, 2022, pp. 62–71, doi:10.1002/pol.20210606.
short: A. Krusenbaum, J. Geisler, F.J.L. Kraus, S. Grätz, M.V. Höfler, T. Gutmann,
L. Borchardt, Journal of Polymer Science 60 (2022) 62–71.
date_created: 2026-02-07T15:50:44Z
date_updated: 2026-02-17T16:16:01Z
doi: 10.1002/pol.20210606
extern: '1'
intvolume: ' 60'
issue: '1'
language:
- iso: eng
page: 62–71
publication: Journal of Polymer Science
status: public
title: The mechanochemical Friedel-Crafts polymerization as a solvent-free cross-linking
approach toward microporous polymers
type: journal_article
user_id: '100715'
volume: 60
year: '2022'
...
---
_id: '63983'
abstract:
- lang: eng
text: Polyethylene glycol (PEG) is increasingly used as an alternative green chemical
solvent. New experimental measurements on density, viscosity, and self-diffusion
coefficient are presented for PEG200, PEG400, and several binary mixtures of tri-
and hexaethylene glycol covering a temperature range from 298.15 to 358.15 K.
Because PEGs are polydisperse, the exact compositions of PEG200 from six different
vendors are analytically determined and found to be comparable. Thus, only two
of the most differing PEG200 samples are further examined. The effects of water
as the most common impurity on densities, viscosities, and self-diffusion coefficients
are inspected as well as the results of the “dry” samples obtained by extrapolation
to zero water content. The obtained results are carefully compared to the available
literature data. The temperature dependence of these physical properties is investigated
and found to be linear for density, while viscosity and self-diffusion coefficients
follow the Arrhenius law. Attempts to calculate the properties of the binary mixtures
and PEG200 samples from the mole fraction weighted average of the physical properties
of the mixture components result in reasonable agreement. Agreement between calculated
and measured molar volumes is within measurement uncertainty. Agreement of calculated
and measured viscosities is mostly within a few percent but increases with decreasing
temperature (largest viscosities) reaching values of up to 15%. Similarly, calculated
and measured self-diffusion coefficients mostly agree within 20%, which is near
the measurement uncertainty, but overestimates increase to 30% for the highest
temperatures (largest self-diffusion coefficients).
author:
- first_name: Markus M.
full_name: Hoffmann, Markus M.
last_name: Hoffmann
- first_name: Joseph D.
full_name: Kealy, Joseph D.
last_name: Kealy
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: Gerd
full_name: Buntkowsky, Gerd
last_name: Buntkowsky
citation:
ama: Hoffmann MM, Kealy JD, Gutmann T, Buntkowsky G. Densities, Viscosities, and
Self-Diffusion Coefficients of Several Polyethylene Glycols. Journal of Chemical
and Engineering Data. 2022;67(1):88–103. doi:10.1021/acs.jced.1c00759
apa: Hoffmann, M. M., Kealy, J. D., Gutmann, T., & Buntkowsky, G. (2022). Densities,
Viscosities, and Self-Diffusion Coefficients of Several Polyethylene Glycols.
Journal of Chemical and Engineering Data, 67(1), 88–103. https://doi.org/10.1021/acs.jced.1c00759
bibtex: '@article{Hoffmann_Kealy_Gutmann_Buntkowsky_2022, title={Densities, Viscosities,
and Self-Diffusion Coefficients of Several Polyethylene Glycols}, volume={67},
DOI={10.1021/acs.jced.1c00759},
number={1}, journal={Journal of Chemical and Engineering Data}, publisher={American
Chemical Society}, author={Hoffmann, Markus M. and Kealy, Joseph D. and Gutmann,
Torsten and Buntkowsky, Gerd}, year={2022}, pages={88–103} }'
chicago: 'Hoffmann, Markus M., Joseph D. Kealy, Torsten Gutmann, and Gerd Buntkowsky.
“Densities, Viscosities, and Self-Diffusion Coefficients of Several Polyethylene
Glycols.” Journal of Chemical and Engineering Data 67, no. 1 (2022): 88–103.
https://doi.org/10.1021/acs.jced.1c00759.'
ieee: 'M. M. Hoffmann, J. D. Kealy, T. Gutmann, and G. Buntkowsky, “Densities, Viscosities,
and Self-Diffusion Coefficients of Several Polyethylene Glycols,” Journal of
Chemical and Engineering Data, vol. 67, no. 1, pp. 88–103, 2022, doi: 10.1021/acs.jced.1c00759.'
mla: Hoffmann, Markus M., et al. “Densities, Viscosities, and Self-Diffusion Coefficients
of Several Polyethylene Glycols.” Journal of Chemical and Engineering Data,
vol. 67, no. 1, American Chemical Society, 2022, pp. 88–103, doi:10.1021/acs.jced.1c00759.
short: M.M. Hoffmann, J.D. Kealy, T. Gutmann, G. Buntkowsky, Journal of Chemical
and Engineering Data 67 (2022) 88–103.
date_created: 2026-02-07T15:44:52Z
date_updated: 2026-02-17T16:16:54Z
doi: 10.1021/acs.jced.1c00759
extern: '1'
intvolume: ' 67'
issue: '1'
language:
- iso: eng
page: 88–103
publication: Journal of Chemical and Engineering Data
publisher: American Chemical Society
status: public
title: Densities, Viscosities, and Self-Diffusion Coefficients of Several Polyethylene
Glycols
type: journal_article
user_id: '100715'
volume: 67
year: '2022'
...
---
_id: '63948'
abstract:
- lang: eng
text: In this work, the behavior of four different commercially available polarizing
agents is investigated employing the non-ionic model surfactant 1-octanol as analyte.
A relative method for the comparison of the proportion of the direct and indirect
polarization transfer pathways is established, allowing a direct comparison of
the polarization efficacy for different radicals and different parts of the 1-octanol
molecule despite differences in radical concentration or sample amount. With this
approach, it could be demonstrated that the hydrophilicity is a key factor in
the way polarization is transferred from the polarizing agent to the analyte.
These findings are confirmed by the determination of buildup times Tb, illustrating
that the choice of polarizing agent plays an essential role in ensuring an optimal
polarization transfer and therefore the maximum amount of enhancement possible
for DNP enhanced NMR measurements.
author:
- first_name: Sonja C.
full_name: Döller, Sonja C.
last_name: Döller
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: Markus
full_name: Hoffmann, Markus
last_name: Hoffmann
- first_name: Gerd
full_name: Buntkowsky, Gerd
last_name: Buntkowsky
citation:
ama: Döller SC, Gutmann T, Hoffmann M, Buntkowsky G. A case study on the influence
of hydrophilicity on the signal enhancement by dynamic nuclear polarization. Solid
State Nuclear Magnetic Resonance. 2022;122:101829.
apa: Döller, S. C., Gutmann, T., Hoffmann, M., & Buntkowsky, G. (2022). A case
study on the influence of hydrophilicity on the signal enhancement by dynamic
nuclear polarization. Solid State Nuclear Magnetic Resonance, 122,
101829.
bibtex: '@article{Döller_Gutmann_Hoffmann_Buntkowsky_2022, title={A case study on
the influence of hydrophilicity on the signal enhancement by dynamic nuclear polarization},
volume={122}, journal={Solid State Nuclear Magnetic Resonance}, author={Döller,
Sonja C. and Gutmann, Torsten and Hoffmann, Markus and Buntkowsky, Gerd}, year={2022},
pages={101829} }'
chicago: 'Döller, Sonja C., Torsten Gutmann, Markus Hoffmann, and Gerd Buntkowsky.
“A Case Study on the Influence of Hydrophilicity on the Signal Enhancement by
Dynamic Nuclear Polarization.” Solid State Nuclear Magnetic Resonance 122
(2022): 101829.'
ieee: S. C. Döller, T. Gutmann, M. Hoffmann, and G. Buntkowsky, “A case study on
the influence of hydrophilicity on the signal enhancement by dynamic nuclear polarization,”
Solid State Nuclear Magnetic Resonance, vol. 122, p. 101829, 2022.
mla: Döller, Sonja C., et al. “A Case Study on the Influence of Hydrophilicity on
the Signal Enhancement by Dynamic Nuclear Polarization.” Solid State Nuclear
Magnetic Resonance, vol. 122, 2022, p. 101829.
short: S.C. Döller, T. Gutmann, M. Hoffmann, G. Buntkowsky, Solid State Nuclear
Magnetic Resonance 122 (2022) 101829.
date_created: 2026-02-07T09:13:08Z
date_updated: 2026-02-17T16:18:26Z
extern: '1'
intvolume: ' 122'
keyword:
- DNP NMR
- Dynamics
- Low temperature NMR
- Octanol
- Solid state NMR
- Surfactants
language:
- iso: eng
page: '101829'
publication: Solid State Nuclear Magnetic Resonance
status: public
title: A case study on the influence of hydrophilicity on the signal enhancement by
dynamic nuclear polarization
type: journal_article
user_id: '100715'
volume: 122
year: '2022'
...
---
_id: '63944'
abstract:
- lang: eng
text: Abstract The donor properties of a set of bulky ferrocene based bisphosphanes
(Fe(C5H4PMes2)2 and (C5H4PMes2)Fe(C5H4PtBu2 with Mes= mesityl and tBu=tert-butyl)
were probed by exploring the NMR parameters of the corresponding selenophosphoranes
amended by cyclovoltammetry. The ligand properties were explored in the complexation
of copper phenylacetylide which is relevant as intermediate in the Cu(I) catalyzed
CO2 addition to phenylacetylene. Owing to the poor solubility of the resulting
complexes their characterization was performed with solid state NMR spectroscopy
amended by IR spectroscopy, mass spectrometry and elemental analysis. Remarkably,
these complexes feature luminescent properties, albeit with limited quantum yield.
author:
- first_name: Subhayan
full_name: Dey, Subhayan
last_name: Dey
- first_name: Fabian
full_name: Roesler, Fabian
last_name: Roesler
- first_name: Mark V.
full_name: Höfler, Mark V.
last_name: Höfler
- first_name: Clemens
full_name: Bruhn, Clemens
last_name: Bruhn
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: Rudolf
full_name: Pietschnig, Rudolf
last_name: Pietschnig
citation:
ama: Dey S, Roesler F, Höfler MV, Bruhn C, Gutmann T, Pietschnig R. Synthesis, Structure
and Cu-Phenylacetylide Coordination of an Unsymmetrically Substituted Bulky dppf-Analog.
European Journal of Inorganic Chemistry. 2022;2022(3):e202100939. doi:10.1002/ejic.202100939
apa: Dey, S., Roesler, F., Höfler, M. V., Bruhn, C., Gutmann, T., & Pietschnig,
R. (2022). Synthesis, Structure and Cu-Phenylacetylide Coordination of an Unsymmetrically
Substituted Bulky dppf-Analog. European Journal of Inorganic Chemistry,
2022(3), e202100939. https://doi.org/10.1002/ejic.202100939
bibtex: '@article{Dey_Roesler_Höfler_Bruhn_Gutmann_Pietschnig_2022, title={Synthesis,
Structure and Cu-Phenylacetylide Coordination of an Unsymmetrically Substituted
Bulky dppf-Analog}, volume={2022}, DOI={10.1002/ejic.202100939},
number={3}, journal={European Journal of Inorganic Chemistry}, author={Dey, Subhayan
and Roesler, Fabian and Höfler, Mark V. and Bruhn, Clemens and Gutmann, Torsten
and Pietschnig, Rudolf}, year={2022}, pages={e202100939} }'
chicago: 'Dey, Subhayan, Fabian Roesler, Mark V. Höfler, Clemens Bruhn, Torsten
Gutmann, and Rudolf Pietschnig. “Synthesis, Structure and Cu-Phenylacetylide Coordination
of an Unsymmetrically Substituted Bulky Dppf-Analog.” European Journal of Inorganic
Chemistry 2022, no. 3 (2022): e202100939. https://doi.org/10.1002/ejic.202100939.'
ieee: 'S. Dey, F. Roesler, M. V. Höfler, C. Bruhn, T. Gutmann, and R. Pietschnig,
“Synthesis, Structure and Cu-Phenylacetylide Coordination of an Unsymmetrically
Substituted Bulky dppf-Analog,” European Journal of Inorganic Chemistry,
vol. 2022, no. 3, p. e202100939, 2022, doi: 10.1002/ejic.202100939.'
mla: Dey, Subhayan, et al. “Synthesis, Structure and Cu-Phenylacetylide Coordination
of an Unsymmetrically Substituted Bulky Dppf-Analog.” European Journal of Inorganic
Chemistry, vol. 2022, no. 3, 2022, p. e202100939, doi:10.1002/ejic.202100939.
short: S. Dey, F. Roesler, M.V. Höfler, C. Bruhn, T. Gutmann, R. Pietschnig, European
Journal of Inorganic Chemistry 2022 (2022) e202100939.
date_created: 2026-02-07T09:11:00Z
date_updated: 2026-02-17T16:18:34Z
doi: 10.1002/ejic.202100939
extern: '1'
intvolume: ' 2022'
issue: '3'
language:
- iso: eng
page: e202100939
publication: European Journal of Inorganic Chemistry
status: public
title: Synthesis, Structure and Cu-Phenylacetylide Coordination of an Unsymmetrically
Substituted Bulky dppf-Analog
type: journal_article
user_id: '100715'
volume: 2022
year: '2022'
...
---
_id: '63943'
abstract:
- lang: eng
text: A lithium halide exchange reaction at low-temperature, via the treatment of
2,6-di(isopropyl)phenyllithium on 1,1′-bis-(dichlorophosphino)ferrocene, resulted
in the first isolated example of an aryl-substituted diphospha [2]ferrocenophane
(diphospha [2]FCP) 2. Although compound 2 did not show any recognizable thermal
reaction at higher temperature (up to 350 °C), its tert-butyl-substituted counterpart
1 underwent a clean selective heat-mediated P–C cleavage reaction, followed
by an inter-molecular rearrangement, to produce a P–P fused bis [3]ferrocenophane
3 with all-trans oriented P-chain, which upon further heating gave a polyferrocenylphosphane
tBu-[Fc’P2]n-tBu (4). Since polymer 4 is insoluble in common organic solvents,
it has been characterized with solid-state techniques, including solid-state NMR.
Density functional theory (DFT) has further been employed to identify possible
pathways for P–C bond cleavage on 1 and 2, as well as to evaluate accessible
pathways for further polymerization toward 4.
author:
- first_name: Subhayan
full_name: Dey, Subhayan
last_name: Dey
- first_name: Denis
full_name: Kargin, Denis
last_name: Kargin
- first_name: Mark V.
full_name: Höfler, Mark V.
last_name: Höfler
- first_name: Balazs
full_name: Szathmari, Balazs
last_name: Szathmari
- first_name: Clemens
full_name: Bruhn, Clemens
last_name: Bruhn
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: Zsolt
full_name: Kelemen, Zsolt
last_name: Kelemen
- first_name: Rudolf
full_name: Pietschnig, Rudolf
last_name: Pietschnig
citation:
ama: Dey S, Kargin D, Höfler MV, et al. Oligo- and polymerization of phospha [2]ferrocenophanes
to one dimensional phosphorus chains with ferrocenylene handles. Polymer.
2022;242:124589.
apa: Dey, S., Kargin, D., Höfler, M. V., Szathmari, B., Bruhn, C., Gutmann, T.,
Kelemen, Z., & Pietschnig, R. (2022). Oligo- and polymerization of phospha
[2]ferrocenophanes to one dimensional phosphorus chains with ferrocenylene handles.
Polymer, 242, 124589.
bibtex: '@article{Dey_Kargin_Höfler_Szathmari_Bruhn_Gutmann_Kelemen_Pietschnig_2022,
title={Oligo- and polymerization of phospha [2]ferrocenophanes to one dimensional
phosphorus chains with ferrocenylene handles}, volume={242}, journal={Polymer},
author={Dey, Subhayan and Kargin, Denis and Höfler, Mark V. and Szathmari, Balazs
and Bruhn, Clemens and Gutmann, Torsten and Kelemen, Zsolt and Pietschnig, Rudolf},
year={2022}, pages={124589} }'
chicago: 'Dey, Subhayan, Denis Kargin, Mark V. Höfler, Balazs Szathmari, Clemens
Bruhn, Torsten Gutmann, Zsolt Kelemen, and Rudolf Pietschnig. “Oligo- and Polymerization
of Phospha [2]Ferrocenophanes to One Dimensional Phosphorus Chains with Ferrocenylene
Handles.” Polymer 242 (2022): 124589.'
ieee: S. Dey et al., “Oligo- and polymerization of phospha [2]ferrocenophanes
to one dimensional phosphorus chains with ferrocenylene handles,” Polymer,
vol. 242, p. 124589, 2022.
mla: Dey, Subhayan, et al. “Oligo- and Polymerization of Phospha [2]Ferrocenophanes
to One Dimensional Phosphorus Chains with Ferrocenylene Handles.” Polymer,
vol. 242, 2022, p. 124589.
short: S. Dey, D. Kargin, M.V. Höfler, B. Szathmari, C. Bruhn, T. Gutmann, Z. Kelemen,
R. Pietschnig, Polymer 242 (2022) 124589.
date_created: 2026-02-07T09:10:38Z
date_updated: 2026-02-17T16:18:36Z
extern: '1'
intvolume: ' 242'
keyword:
- solid-state nmr
- Ansa-ferrocene
- DFT calculations
- Oligophosphine
- Polyphosphane
- Ring-opening polymerization
language:
- iso: eng
page: '124589'
publication: Polymer
status: public
title: Oligo- and polymerization of phospha [2]ferrocenophanes to one dimensional
phosphorus chains with ferrocenylene handles
type: journal_article
user_id: '100715'
volume: 242
year: '2022'
...
---
_id: '63934'
author:
- first_name: Gerd
full_name: Buntkowsky, Gerd
last_name: Buntkowsky
- first_name: Sonja
full_name: Döller, Sonja
last_name: Döller
- first_name: Nadia
full_name: Haro-Mares, Nadia
last_name: Haro-Mares
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: Markus
full_name: Hoffmann, Markus
last_name: Hoffmann
citation:
ama: Buntkowsky G, Döller S, Haro-Mares N, Gutmann T, Hoffmann M. Solid-state NMR
studies of non-ionic surfactants confined in mesoporous silica. Zeitschrift
für Physikalische Chemie. 2022;236(6-8):939–960. doi:10.1515/zpch-2021-3132
apa: Buntkowsky, G., Döller, S., Haro-Mares, N., Gutmann, T., & Hoffmann, M.
(2022). Solid-state NMR studies of non-ionic surfactants confined in mesoporous
silica. Zeitschrift Für Physikalische Chemie, 236(6–8), 939–960.
https://doi.org/10.1515/zpch-2021-3132
bibtex: '@article{Buntkowsky_Döller_Haro-Mares_Gutmann_Hoffmann_2022, title={Solid-state
NMR studies of non-ionic surfactants confined in mesoporous silica}, volume={236},
DOI={10.1515/zpch-2021-3132},
number={6–8}, journal={Zeitschrift für Physikalische Chemie}, author={Buntkowsky,
Gerd and Döller, Sonja and Haro-Mares, Nadia and Gutmann, Torsten and Hoffmann,
Markus}, year={2022}, pages={939–960} }'
chicago: 'Buntkowsky, Gerd, Sonja Döller, Nadia Haro-Mares, Torsten Gutmann, and
Markus Hoffmann. “Solid-State NMR Studies of Non-Ionic Surfactants Confined in
Mesoporous Silica.” Zeitschrift Für Physikalische Chemie 236, no. 6–8 (2022):
939–960. https://doi.org/10.1515/zpch-2021-3132.'
ieee: 'G. Buntkowsky, S. Döller, N. Haro-Mares, T. Gutmann, and M. Hoffmann, “Solid-state
NMR studies of non-ionic surfactants confined in mesoporous silica,” Zeitschrift
für Physikalische Chemie, vol. 236, no. 6–8, pp. 939–960, 2022, doi: 10.1515/zpch-2021-3132.'
mla: Buntkowsky, Gerd, et al. “Solid-State NMR Studies of Non-Ionic Surfactants
Confined in Mesoporous Silica.” Zeitschrift Für Physikalische Chemie, vol.
236, no. 6–8, 2022, pp. 939–960, doi:10.1515/zpch-2021-3132.
short: G. Buntkowsky, S. Döller, N. Haro-Mares, T. Gutmann, M. Hoffmann, Zeitschrift
Für Physikalische Chemie 236 (2022) 939–960.
date_created: 2026-02-07T09:04:06Z
date_updated: 2026-02-17T16:18:55Z
doi: 10.1515/zpch-2021-3132
extern: '1'
intvolume: ' 236'
issue: 6-8
language:
- iso: eng
page: 939–960
publication: Zeitschrift für Physikalische Chemie
status: public
title: Solid-state NMR studies of non-ionic surfactants confined in mesoporous silica
type: journal_article
user_id: '100715'
volume: 236
year: '2022'
...
---
_id: '63932'
author:
- first_name: G.
full_name: Buntkowsky, G.
last_name: Buntkowsky
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
citation:
ama: Buntkowsky G, Gutmann T. PASADENA NMR. Nature Catalysis. 2022;5:848–849.
apa: Buntkowsky, G., & Gutmann, T. (2022). PASADENA NMR. Nature Catalysis,
5, 848–849.
bibtex: '@article{Buntkowsky_Gutmann_2022, title={PASADENA NMR}, volume={5}, journal={Nature
Catalysis}, author={Buntkowsky, G. and Gutmann, Torsten}, year={2022}, pages={848–849}
}'
chicago: 'Buntkowsky, G., and Torsten Gutmann. “PASADENA NMR.” Nature Catalysis
5 (2022): 848–849.'
ieee: G. Buntkowsky and T. Gutmann, “PASADENA NMR,” Nature Catalysis, vol.
5, pp. 848–849, 2022.
mla: Buntkowsky, G., and Torsten Gutmann. “PASADENA NMR.” Nature Catalysis,
vol. 5, 2022, pp. 848–849.
short: G. Buntkowsky, T. Gutmann, Nature Catalysis 5 (2022) 848–849.
date_created: 2026-02-07T09:02:44Z
date_updated: 2026-02-17T16:18:59Z
extern: '1'
intvolume: ' 5'
language:
- iso: eng
page: 848–849
publication: Nature Catalysis
status: public
title: PASADENA NMR
type: journal_article
user_id: '100715'
volume: 5
year: '2022'
...
---
_id: '34569'
citation:
ama: On the (Limited) Generalization of MasterFace Attacks and Its Relation to the
Capacity of Face Representations. Published online 2022. doi:10.48550/ARXIV.2203.12387
apa: On the (Limited) Generalization of MasterFace Attacks and Its Relation to
the Capacity of Face Representations. (2022). https://doi.org/10.48550/ARXIV.2203.12387
bibtex: '@article{On the (Limited) Generalization of MasterFace Attacks and Its
Relation to the Capacity of Face Representations_2022, DOI={10.48550/ARXIV.2203.12387},
year={2022} }'
chicago: “On the (Limited) Generalization of MasterFace Attacks and Its Relation
to the Capacity of Face Representations,” 2022. https://doi.org/10.48550/ARXIV.2203.12387.
ieee: '“On the (Limited) Generalization of MasterFace Attacks and Its Relation to
the Capacity of Face Representations,” 2022, doi: 10.48550/ARXIV.2203.12387.'
mla: On the (Limited) Generalization of MasterFace Attacks and Its Relation to
the Capacity of Face Representations. 2022, doi:10.48550/ARXIV.2203.12387.
short: (2022).
date_created: 2022-12-19T13:22:51Z
date_updated: 2026-02-18T09:49:35Z
doi: 10.48550/ARXIV.2203.12387
status: public
title: On the (Limited) Generalization of MasterFace Attacks and Its Relation to the
Capacity of Face Representations
type: journal_article
user_id: '97123'
year: '2022'
...
---
_id: '64216'
abstract:
- lang: eng
text: "Let X_n, n ≥ 0 be a Markov chain with finite state space M . If x, y ∈ M
such that x is transient we have P_y (X_n = x) → 0 for n → ∞, and under mild aperiodicity
conditions this convergence is monotone in that for some N we have ∀n ≥ N : P_y
(X_n = x) ≥ Py (X_(n+1) = x). We use bounds on the rate of convergence of the
Markov chain to its quasi-stationary distribution to obtain explicit bounds on
N . We then apply this result to Bernoulli percolation with parameter p on the
cylinder graph C_k × Z. Utilizing a Markov chain describing infection patterns
layer per layer, we thus show the following uniform result on the monotonicity
of connection probabilities: ∀k ≥ 3 ∀n ≥ 500k^62^k ∀p ∈ (0, 1) ∀m ∈ C_k :\r\nP_p((0,
0) ↔ (m, n)) ≥ P_p((0, 0) ↔ (m, n + 1)). In general these kind of monotonicity
properties of connection probabilities are difficult to establish and there are
only few pertaining results. "
author:
- first_name: Thomas
full_name: Richthammer, Thomas
id: '62054'
last_name: Richthammer
- first_name: Philipp
full_name: König, Philipp
last_name: König
citation:
ama: Richthammer T, König P. Monotonicity of Markov chain transition probabilities
via quasi-stationarity - an application to Bernoulli percolation on C_k × Z. Published
online 2022.
apa: Richthammer, T., & König, P. (2022). Monotonicity of Markov chain transition
probabilities via quasi-stationarity - an application to Bernoulli percolation
on C_k × Z.
bibtex: '@article{Richthammer_König_2022, title={Monotonicity of Markov chain transition
probabilities via quasi-stationarity - an application to Bernoulli percolation
on C_k × Z}, author={Richthammer, Thomas and König, Philipp}, year={2022} }'
chicago: Richthammer, Thomas, and Philipp König. “Monotonicity of Markov Chain Transition
Probabilities via Quasi-Stationarity - an Application to Bernoulli Percolation
on C_k × Z,” 2022.
ieee: T. Richthammer and P. König, “Monotonicity of Markov chain transition probabilities
via quasi-stationarity - an application to Bernoulli percolation on C_k × Z.”
2022.
mla: Richthammer, Thomas, and Philipp König. Monotonicity of Markov Chain Transition
Probabilities via Quasi-Stationarity - an Application to Bernoulli Percolation
on C_k × Z. 2022.
short: T. Richthammer, P. König, (2022).
date_created: 2026-02-18T12:27:28Z
date_updated: 2026-02-18T12:27:38Z
language:
- iso: eng
status: public
title: Monotonicity of Markov chain transition probabilities via quasi-stationarity
- an application to Bernoulli percolation on C_k × Z
type: preprint
user_id: '62054'
year: '2022'
...
---
_id: '64214'
abstract:
- lang: eng
text: 'For Bernoulli percolation on a given graph G = (V,E) we consider the cluster
of some fixed vertex o \in V. We aim at comparing the number of vertices of this
cluster in the set V_+ and in the set V_-, where V_+,V_- \subset V have the same
size. Intuitively, if V_- is further away from o than V_+, it should contain fewer
vertices of the cluster. We prove such a result in terms of stochastic domination,
provided that o \in V_+, and V_+,V_- satisfy some strong symmetry conditions,
and we give applications of this result in case G is a bunkbed graph, a layered
graph, the 2D square lattice or a hypercube graph. Our result only relies on general
probabilistic techniques and a combinatorial result on group actions, and thus
extends to fairly general random partitions, e.g. as induced by Bernoulli site
percolation or the random cluster model. '
author:
- first_name: Thomas
full_name: Richthammer, Thomas
id: '62054'
last_name: Richthammer
citation:
ama: Richthammer T. Comparing the number of infected vertices in two symmetric sets
for Bernoulli percolation (and other random partitions). Published online 2022.
apa: Richthammer, T. (2022). Comparing the number of infected vertices in two
symmetric sets for Bernoulli percolation (and other random partitions).
bibtex: '@article{Richthammer_2022, title={Comparing the number of infected vertices
in two symmetric sets for Bernoulli percolation (and other random partitions)},
author={Richthammer, Thomas}, year={2022} }'
chicago: Richthammer, Thomas. “Comparing the Number of Infected Vertices in Two
Symmetric Sets for Bernoulli Percolation (and Other Random Partitions),” 2022.
ieee: T. Richthammer, “Comparing the number of infected vertices in two symmetric
sets for Bernoulli percolation (and other random partitions).” 2022.
mla: Richthammer, Thomas. Comparing the Number of Infected Vertices in Two Symmetric
Sets for Bernoulli Percolation (and Other Random Partitions). 2022.
short: T. Richthammer, (2022).
date_created: 2026-02-18T12:13:09Z
date_updated: 2026-02-18T12:13:21Z
language:
- iso: eng
status: public
title: Comparing the number of infected vertices in two symmetric sets for Bernoulli
percolation (and other random partitions)
type: preprint
user_id: '62054'
year: '2022'
...
---
_id: '64215'
abstract:
- lang: eng
text: "Let G = (V, E) be a simple finite graph. The corresponding bunkbed graph
G± consists of two copies G+ = (V +, E+), G− = (V −, E−) of G and additional edges
connecting any two vertices v+ ∈ V+, v− ∈ V− that are the copies of a vertex v
∈ V . The bunkbed conjecture states that for independent bond percolation on G±,
for all v, w ∈ V , it is more likely for\r\nv−, w− to be connected than for v−,
w+ to be connected. While recently a counterexample for the bunkbed conjecture
was found, it should still hold for many interesting classes of graphs, and here
we give a proof for complete bipartite graphs, complete graphs minus the edges
of a complete subgraph, and symmetric complete k-partite graphs."
author:
- first_name: Thomas
full_name: Richthammer, Thomas
id: '62054'
last_name: Richthammer
citation:
ama: Richthammer T. Bunkbed conjecture for complete bipartite graphs and related
classes of graphs. Published online 2022.
apa: Richthammer, T. (2022). Bunkbed conjecture for complete bipartite graphs
and related classes of graphs.
bibtex: '@article{Richthammer_2022, title={Bunkbed conjecture for complete bipartite
graphs and related classes of graphs}, author={Richthammer, Thomas}, year={2022}
}'
chicago: Richthammer, Thomas. “Bunkbed Conjecture for Complete Bipartite Graphs
and Related Classes of Graphs,” 2022.
ieee: T. Richthammer, “Bunkbed conjecture for complete bipartite graphs and related
classes of graphs.” 2022.
mla: Richthammer, Thomas. Bunkbed Conjecture for Complete Bipartite Graphs and
Related Classes of Graphs. 2022.
short: T. Richthammer, (2022).
date_created: 2026-02-18T12:17:42Z
date_updated: 2026-02-18T12:23:17Z
language:
- iso: eng
status: public
title: Bunkbed conjecture for complete bipartite graphs and related classes of graphs
type: preprint
user_id: '62054'
year: '2022'
...
---
_id: '34570'
author:
- first_name: Philipp
full_name: Terhörst, Philipp
id: '97123'
last_name: Terhörst
citation:
ama: Terhörst P. On the (Limited) Generalization of MasterFace Attacks and Its Relation
to the Capacity of Face Representations. IEEE IJCB. Published online 2022.
doi:10.48550/ARXIV.2203.12387
apa: Terhörst, P. (2022). On the (Limited) Generalization of MasterFace Attacks
and Its Relation to the Capacity of Face Representations. IEEE IJCB. https://doi.org/10.48550/ARXIV.2203.12387
bibtex: '@article{Terhörst_2022, title={On the (Limited) Generalization of MasterFace
Attacks and Its Relation to the Capacity of Face Representations}, DOI={10.48550/ARXIV.2203.12387},
journal={IEEE IJCB}, author={Terhörst, Philipp}, year={2022} }'
chicago: Terhörst, Philipp. “On the (Limited) Generalization of MasterFace Attacks
and Its Relation to the Capacity of Face Representations.” IEEE IJCB, 2022.
https://doi.org/10.48550/ARXIV.2203.12387.
ieee: 'P. Terhörst, “On the (Limited) Generalization of MasterFace Attacks and Its
Relation to the Capacity of Face Representations,” IEEE IJCB, 2022, doi:
10.48550/ARXIV.2203.12387.'
mla: Terhörst, Philipp. “On the (Limited) Generalization of MasterFace Attacks and
Its Relation to the Capacity of Face Representations.” IEEE IJCB, 2022,
doi:10.48550/ARXIV.2203.12387.
short: P. Terhörst, IEEE IJCB (2022).
date_created: 2022-12-19T13:23:11Z
date_updated: 2026-02-19T07:49:43Z
doi: 10.48550/ARXIV.2203.12387
language:
- iso: eng
publication: IEEE IJCB
status: public
title: On the (Limited) Generalization of MasterFace Attacks and Its Relation to the
Capacity of Face Representations
type: journal_article
user_id: '97123'
year: '2022'
...
---
_id: '64260'
author:
- first_name: Thomas
full_name: Mager, Thomas
last_name: Mager
- first_name: Christoph
full_name: Jürgenhake, Christoph
last_name: Jürgenhake
- first_name: Roman
full_name: Dumitrescu, Roman
id: '16190'
last_name: Dumitrescu
citation:
ama: 'Mager T, Jürgenhake C, Dumitrescu R. Efficient method for determining substrate
parameters of additive manufactured spatial circuit carriers. In: Proceedings
of the German Microwave Conference (GeMiC). ; 2022:224-227.'
apa: Mager, T., Jürgenhake, C., & Dumitrescu, R. (2022). Efficient method for
determining substrate parameters of additive manufactured spatial circuit carriers.
Proceedings of the German Microwave Conference (GeMiC), 224–227.
bibtex: '@inproceedings{Mager_Jürgenhake_Dumitrescu_2022, title={Efficient method
for determining substrate parameters of additive manufactured spatial circuit
carriers}, booktitle={Proceedings of the German Microwave Conference (GeMiC)},
author={Mager, Thomas and Jürgenhake, Christoph and Dumitrescu, Roman}, year={2022},
pages={224–227} }'
chicago: Mager, Thomas, Christoph Jürgenhake, and Roman Dumitrescu. “Efficient Method
for Determining Substrate Parameters of Additive Manufactured Spatial Circuit
Carriers.” In Proceedings of the German Microwave Conference (GeMiC), 224–27,
2022.
ieee: T. Mager, C. Jürgenhake, and R. Dumitrescu, “Efficient method for determining
substrate parameters of additive manufactured spatial circuit carriers,” in Proceedings
of the German Microwave Conference (GeMiC), Ulm, 2022, pp. 224–227.
mla: Mager, Thomas, et al. “Efficient Method for Determining Substrate Parameters
of Additive Manufactured Spatial Circuit Carriers.” Proceedings of the German
Microwave Conference (GeMiC), 2022, pp. 224–27.
short: 'T. Mager, C. Jürgenhake, R. Dumitrescu, in: Proceedings of the German Microwave
Conference (GeMiC), 2022, pp. 224–227.'
conference:
location: Ulm
name: 14th German Microwave Conference (GeMiC)
date_created: 2026-02-19T11:13:35Z
date_updated: 2026-02-19T11:13:45Z
department:
- _id: '563'
language:
- iso: eng
page: 224-227
publication: Proceedings of the German Microwave Conference (GeMiC)
status: public
title: Efficient method for determining substrate parameters of additive manufactured
spatial circuit carriers
type: conference
user_id: '15782'
year: '2022'
...
---
_id: '64272'
abstract:
- lang: eng
text: "AbstractIn the present paper we further
the study of the compression cone of a real spherical homogeneous space $$Z=G/H$$\r\n \r\n
\ Z\r\n =\r\n
\ G\r\n /\r\n
\ H\r\n \r\n .
In particular we provide a geometric construction of the little Weyl group of
Z introduced recently by Knop and Krötz. Our technique
is based on a fine analysis of limits of conjugates of the subalgebra $$\\mathrm{Lie}(H)$$\r\n \r\n
\ Lie\r\n (\r\n
\ H\r\n )\r\n
\ \r\n
along one-parameter subgroups in the Grassmannian of subspaces of $$\\mathrm{Lie}(G)$$\r\n \r\n
\ Lie\r\n (\r\n
\ G\r\n )\r\n
\ \r\n .
The little Weyl group is obtained as a finite reflection group generated by the
reflections in the walls of the compression cone."
author:
- first_name: Job J.
full_name: Kuit, Job J.
last_name: Kuit
- first_name: Eitan
full_name: Sayag, Eitan
last_name: Sayag
citation:
ama: Kuit JJ, Sayag E. On the little Weyl group of a real spherical space. Mathematische
Annalen. 2022;387(1-2):433-498. doi:10.1007/s00208-022-02473-x
apa: Kuit, J. J., & Sayag, E. (2022). On the little Weyl group of a real spherical
space. Mathematische Annalen, 387(1–2), 433–498. https://doi.org/10.1007/s00208-022-02473-x
bibtex: '@article{Kuit_Sayag_2022, title={On the little Weyl group of a real spherical
space}, volume={387}, DOI={10.1007/s00208-022-02473-x},
number={1–2}, journal={Mathematische Annalen}, publisher={Springer Science and
Business Media LLC}, author={Kuit, Job J. and Sayag, Eitan}, year={2022}, pages={433–498}
}'
chicago: 'Kuit, Job J., and Eitan Sayag. “On the Little Weyl Group of a Real Spherical
Space.” Mathematische Annalen 387, no. 1–2 (2022): 433–98. https://doi.org/10.1007/s00208-022-02473-x.'
ieee: 'J. J. Kuit and E. Sayag, “On the little Weyl group of a real spherical space,”
Mathematische Annalen, vol. 387, no. 1–2, pp. 433–498, 2022, doi: 10.1007/s00208-022-02473-x.'
mla: Kuit, Job J., and Eitan Sayag. “On the Little Weyl Group of a Real Spherical
Space.” Mathematische Annalen, vol. 387, no. 1–2, Springer Science and
Business Media LLC, 2022, pp. 433–98, doi:10.1007/s00208-022-02473-x.
short: J.J. Kuit, E. Sayag, Mathematische Annalen 387 (2022) 433–498.
date_created: 2026-02-19T13:24:21Z
date_updated: 2026-02-19T13:25:52Z
doi: 10.1007/s00208-022-02473-x
intvolume: ' 387'
issue: 1-2
language:
- iso: eng
page: 433-498
publication: Mathematische Annalen
publication_identifier:
issn:
- 0025-5831
- 1432-1807
publication_status: published
publisher: Springer Science and Business Media LLC
status: public
title: On the little Weyl group of a real spherical space
type: journal_article
user_id: '52730'
volume: 387
year: '2022'
...
---
_id: '64273'
author:
- first_name: Heiko
full_name: Gimperlein, Heiko
last_name: Gimperlein
- first_name: Bernhard
full_name: Krötz, Bernhard
last_name: Krötz
- first_name: Job
full_name: Kuit, Job
last_name: Kuit
- first_name: Henrik
full_name: Schlichtkrull, Henrik
last_name: Schlichtkrull
citation:
ama: Gimperlein H, Krötz B, Kuit J, Schlichtkrull H. A Paley–Wiener theorem for
Harish–Chandra modules. Cambridge Journal of Mathematics. 2022;10(3):689-742.
doi:10.4310/cjm.2022.v10.n3.a3
apa: Gimperlein, H., Krötz, B., Kuit, J., & Schlichtkrull, H. (2022). A Paley–Wiener
theorem for Harish–Chandra modules. Cambridge Journal of Mathematics, 10(3),
689–742. https://doi.org/10.4310/cjm.2022.v10.n3.a3
bibtex: '@article{Gimperlein_Krötz_Kuit_Schlichtkrull_2022, title={A Paley–Wiener
theorem for Harish–Chandra modules}, volume={10}, DOI={10.4310/cjm.2022.v10.n3.a3},
number={3}, journal={Cambridge Journal of Mathematics}, publisher={International
Press of Boston}, author={Gimperlein, Heiko and Krötz, Bernhard and Kuit, Job
and Schlichtkrull, Henrik}, year={2022}, pages={689–742} }'
chicago: 'Gimperlein, Heiko, Bernhard Krötz, Job Kuit, and Henrik Schlichtkrull.
“A Paley–Wiener Theorem for Harish–Chandra Modules.” Cambridge Journal of Mathematics
10, no. 3 (2022): 689–742. https://doi.org/10.4310/cjm.2022.v10.n3.a3.'
ieee: 'H. Gimperlein, B. Krötz, J. Kuit, and H. Schlichtkrull, “A Paley–Wiener theorem
for Harish–Chandra modules,” Cambridge Journal of Mathematics, vol. 10,
no. 3, pp. 689–742, 2022, doi: 10.4310/cjm.2022.v10.n3.a3.'
mla: Gimperlein, Heiko, et al. “A Paley–Wiener Theorem for Harish–Chandra Modules.”
Cambridge Journal of Mathematics, vol. 10, no. 3, International Press of
Boston, 2022, pp. 689–742, doi:10.4310/cjm.2022.v10.n3.a3.
short: H. Gimperlein, B. Krötz, J. Kuit, H. Schlichtkrull, Cambridge Journal of
Mathematics 10 (2022) 689–742.
date_created: 2026-02-19T13:25:10Z
date_updated: 2026-02-19T13:25:49Z
doi: 10.4310/cjm.2022.v10.n3.a3
intvolume: ' 10'
issue: '3'
language:
- iso: eng
page: 689-742
publication: Cambridge Journal of Mathematics
publication_identifier:
issn:
- 2168-0930
- 2168-0949
publication_status: published
publisher: International Press of Boston
status: public
title: A Paley–Wiener theorem for Harish–Chandra modules
type: journal_article
user_id: '52730'
volume: 10
year: '2022'
...
---
_id: '64268'
author:
- first_name: Job
full_name: Kuit, Job
id: '52730'
last_name: Kuit
citation:
ama: Kuit J. Plancherel Theory on Real Spherical Spaces.; 2022.
apa: Kuit, J. (2022). Plancherel theory on real spherical spaces.
bibtex: '@book{Kuit_2022, title={Plancherel theory on real spherical spaces}, author={Kuit,
Job}, year={2022} }'
chicago: Kuit, Job. Plancherel Theory on Real Spherical Spaces, 2022.
ieee: J. Kuit, Plancherel theory on real spherical spaces. 2022.
mla: Kuit, Job. Plancherel Theory on Real Spherical Spaces. 2022.
short: J. Kuit, Plancherel Theory on Real Spherical Spaces, 2022.
date_created: 2026-02-19T13:18:11Z
date_updated: 2026-02-19T13:24:06Z
ddc:
- '510'
department:
- _id: '10'
file:
- access_level: closed
content_type: application/pdf
creator: jobkuit
date_created: 2026-02-19T13:17:23Z
date_updated: 2026-02-19T13:17:23Z
file_id: '64269'
file_name: HabilitatieThesis.pdf
file_size: 1510358
relation: main_file
success: 1
file_date_updated: 2026-02-19T13:17:23Z
has_accepted_license: '1'
language:
- iso: eng
status: public
title: Plancherel theory on real spherical spaces
type: habilitation
user_id: '52730'
year: '2022'
...
---
_id: '64274'
author:
- first_name: Bernhard
full_name: Krötz, Bernhard
last_name: Krötz
- first_name: Job J.
full_name: Kuit, Job J.
last_name: Kuit
- first_name: Henrik
full_name: Schlichtkrull, Henrik
last_name: Schlichtkrull
citation:
ama: Krötz B, Kuit JJ, Schlichtkrull H. Discrete series representations with non-tempered
embedding. Indagationes Mathematicae. 2022;33(4):869-879. doi:10.1016/j.indag.2022.02.010
apa: Krötz, B., Kuit, J. J., & Schlichtkrull, H. (2022). Discrete series representations
with non-tempered embedding. Indagationes Mathematicae, 33(4), 869–879.
https://doi.org/10.1016/j.indag.2022.02.010
bibtex: '@article{Krötz_Kuit_Schlichtkrull_2022, title={Discrete series representations
with non-tempered embedding}, volume={33}, DOI={10.1016/j.indag.2022.02.010},
number={4}, journal={Indagationes Mathematicae}, publisher={Elsevier BV}, author={Krötz,
Bernhard and Kuit, Job J. and Schlichtkrull, Henrik}, year={2022}, pages={869–879}
}'
chicago: 'Krötz, Bernhard, Job J. Kuit, and Henrik Schlichtkrull. “Discrete Series
Representations with Non-Tempered Embedding.” Indagationes Mathematicae
33, no. 4 (2022): 869–79. https://doi.org/10.1016/j.indag.2022.02.010.'
ieee: 'B. Krötz, J. J. Kuit, and H. Schlichtkrull, “Discrete series representations
with non-tempered embedding,” Indagationes Mathematicae, vol. 33, no. 4,
pp. 869–879, 2022, doi: 10.1016/j.indag.2022.02.010.'
mla: Krötz, Bernhard, et al. “Discrete Series Representations with Non-Tempered
Embedding.” Indagationes Mathematicae, vol. 33, no. 4, Elsevier BV, 2022,
pp. 869–79, doi:10.1016/j.indag.2022.02.010.
short: B. Krötz, J.J. Kuit, H. Schlichtkrull, Indagationes Mathematicae 33 (2022)
869–879.
date_created: 2026-02-19T13:26:33Z
date_updated: 2026-02-19T13:26:43Z
doi: 10.1016/j.indag.2022.02.010
intvolume: ' 33'
issue: '4'
language:
- iso: eng
page: 869-879
publication: Indagationes Mathematicae
publication_identifier:
issn:
- 0019-3577
publication_status: published
publisher: Elsevier BV
status: public
title: Discrete series representations with non-tempered embedding
type: journal_article
user_id: '52730'
volume: 33
year: '2022'
...
---
_id: '59668'
abstract:
- lang: eng
text: AbstractSpin‐controlled lasers are highly
interesting photonic devices and have been shown to provide ultrafast polarization
dynamics in excess of 200 GHz. In contrast to conventional semiconductor lasers
their temporal properties are not limited by the intensity dynamics, but are governed
primarily by the interaction of the spin dynamics with the birefringent mode splitting
that determines the polarization oscillation frequency. Another class of modern
semiconductor lasers are high‐β emitters, which benefit
from enhanced light–matter interaction due to strong mode confinement in low‐mode‐volume
microcavities. In such structures, the emission properties can be tailored by
the resonator geometry to realize for instance bimodal emission behavior in slightly
elliptical micropillar cavities. This attractive feature is utilized to demonstrate
and explore spin‐lasing effects in bimodal high‐β quantum
dot micropillar lasers. The studied microlasers with a β‐factor
of 4% show spin‐laser effects with experimental polarization oscillation frequencies
up to 15 GHz and predicted frequencies up to about 100 GHz, which are controlled
by the ellipticity of the resonator. These results reveal appealing prospects
for very compact, ultrafast, and energy‐efficient spin‐lasers and can pave the
way for future purely electrically injected spin‐lasers enabled by short injection
path lengths.
author:
- first_name: Niels
full_name: Heermeier, Niels
last_name: Heermeier
- first_name: Tobias
full_name: Heuser, Tobias
last_name: Heuser
- first_name: Jan
full_name: Große, Jan
last_name: Große
- first_name: Natalie
full_name: Jung, Natalie
last_name: Jung
- first_name: Arsenty
full_name: Kaganskiy, Arsenty
last_name: Kaganskiy
- first_name: Markus
full_name: Lindemann, Markus
last_name: Lindemann
- first_name: Nils Christopher
full_name: Gerhardt, Nils Christopher
id: '115298'
last_name: Gerhardt
orcid: 0009-0002-5538-231X
- first_name: Martin R.
full_name: Hofmann, Martin R.
last_name: Hofmann
- first_name: Stephan
full_name: Reitzenstein, Stephan
last_name: Reitzenstein
citation:
ama: Heermeier N, Heuser T, Große J, et al. Spin‐Lasing in Bimodal Quantum Dot Micropillar
Cavities. Laser & Photonics Reviews. 2022;16(4). doi:10.1002/lpor.202100585
apa: Heermeier, N., Heuser, T., Große, J., Jung, N., Kaganskiy, A., Lindemann, M.,
Gerhardt, N. C., Hofmann, M. R., & Reitzenstein, S. (2022). Spin‐Lasing in
Bimodal Quantum Dot Micropillar Cavities. Laser & Photonics Reviews,
16(4). https://doi.org/10.1002/lpor.202100585
bibtex: '@article{Heermeier_Heuser_Große_Jung_Kaganskiy_Lindemann_Gerhardt_Hofmann_Reitzenstein_2022,
title={Spin‐Lasing in Bimodal Quantum Dot Micropillar Cavities}, volume={16},
DOI={10.1002/lpor.202100585},
number={4}, journal={Laser & Photonics Reviews}, publisher={Wiley}, author={Heermeier,
Niels and Heuser, Tobias and Große, Jan and Jung, Natalie and Kaganskiy, Arsenty
and Lindemann, Markus and Gerhardt, Nils Christopher and Hofmann, Martin R. and
Reitzenstein, Stephan}, year={2022} }'
chicago: Heermeier, Niels, Tobias Heuser, Jan Große, Natalie Jung, Arsenty Kaganskiy,
Markus Lindemann, Nils Christopher Gerhardt, Martin R. Hofmann, and Stephan Reitzenstein.
“Spin‐Lasing in Bimodal Quantum Dot Micropillar Cavities.” Laser &
Photonics Reviews 16, no. 4 (2022). https://doi.org/10.1002/lpor.202100585.
ieee: 'N. Heermeier et al., “Spin‐Lasing in Bimodal Quantum Dot Micropillar
Cavities,” Laser & Photonics Reviews, vol. 16, no. 4, 2022, doi:
10.1002/lpor.202100585.'
mla: Heermeier, Niels, et al. “Spin‐Lasing in Bimodal Quantum Dot Micropillar Cavities.”
Laser & Photonics Reviews, vol. 16, no. 4, Wiley, 2022, doi:10.1002/lpor.202100585.
short: N. Heermeier, T. Heuser, J. Große, N. Jung, A. Kaganskiy, M. Lindemann, N.C.
Gerhardt, M.R. Hofmann, S. Reitzenstein, Laser & Photonics Reviews 16
(2022).
date_created: 2025-04-24T09:09:18Z
date_updated: 2026-02-19T14:23:16Z
department:
- _id: '977'
doi: 10.1002/lpor.202100585
intvolume: ' 16'
issue: '4'
language:
- iso: eng
publication: Laser & Photonics Reviews
publication_identifier:
issn:
- 1863-8880
- 1863-8899
publication_status: published
publisher: Wiley
status: public
title: Spin‐Lasing in Bimodal Quantum Dot Micropillar Cavities
type: journal_article
user_id: '15911'
volume: 16
year: '2022'
...