---
_id: '63969'
abstract:
- lang: eng
  text: A number of Ir-N-heterocyclic carbene (Ir-NHC) complexes with asymmetric N-heterocyclic
    carbene (NHC) ligands have been prepared and examined for signal amplification
    by reversible exchange (SABRE). Pyridine was chosen as model compound for hyperpolarization
    experiments. This substrate was examined in a solvent mixture using several Ir-NHC
    complexes, which differ in their NHC ligands. The SABRE polarization was created
    at 6mT and the H-1 nuclear magnetic resonancesignals were detected at 7T. We show
    that asymmetric NHC ligands, because of their favorable chemistry, can adapt the
    SABREactive complexes to different chemical scenarios.
author:
- first_name: S.
  full_name: Hadjiali, S.
  last_name: Hadjiali
- first_name: R.
  full_name: Savka, R.
  last_name: Savka
- first_name: M.
  full_name: Plaumann, M.
  last_name: Plaumann
- first_name: U.
  full_name: Bommerich, U.
  last_name: Bommerich
- first_name: S.
  full_name: Bothe, S.
  last_name: Bothe
- first_name: Torsten
  full_name: Gutmann, Torsten
  id: '118165'
  last_name: Gutmann
- first_name: T.
  full_name: Ratajczyk, T.
  last_name: Ratajczyk
- first_name: J.
  full_name: Bernarding, J.
  last_name: Bernarding
- first_name: H. H.
  full_name: Limbach, H. H.
  last_name: Limbach
- first_name: H.
  full_name: Plenio, H.
  last_name: Plenio
- first_name: G.
  full_name: Buntkowsky, G.
  last_name: Buntkowsky
citation:
  ama: Hadjiali S, Savka R, Plaumann M, et al. Substituent Influences on the NMR Signal
    Amplification of Ir Complexes with Heterocyclic Carbene Ligands. <i>Applied Magnetic
    Resonance</i>. 2019;50(7):895–902. doi:<a href="https://doi.org/10.1007/s00723-019-01115-x">10.1007/s00723-019-01115-x</a>
  apa: Hadjiali, S., Savka, R., Plaumann, M., Bommerich, U., Bothe, S., Gutmann, T.,
    Ratajczyk, T., Bernarding, J., Limbach, H. H., Plenio, H., &#38; Buntkowsky, G.
    (2019). Substituent Influences on the NMR Signal Amplification of Ir Complexes
    with Heterocyclic Carbene Ligands. <i>Applied Magnetic Resonance</i>, <i>50</i>(7),
    895–902. <a href="https://doi.org/10.1007/s00723-019-01115-x">https://doi.org/10.1007/s00723-019-01115-x</a>
  bibtex: '@article{Hadjiali_Savka_Plaumann_Bommerich_Bothe_Gutmann_Ratajczyk_Bernarding_Limbach_Plenio_et
    al._2019, title={Substituent Influences on the NMR Signal Amplification of Ir
    Complexes with Heterocyclic Carbene Ligands}, volume={50}, DOI={<a href="https://doi.org/10.1007/s00723-019-01115-x">10.1007/s00723-019-01115-x</a>},
    number={7}, journal={Applied Magnetic Resonance}, author={Hadjiali, S. and Savka,
    R. and Plaumann, M. and Bommerich, U. and Bothe, S. and Gutmann, Torsten and Ratajczyk,
    T. and Bernarding, J. and Limbach, H. H. and Plenio, H. and et al.}, year={2019},
    pages={895–902} }'
  chicago: 'Hadjiali, S., R. Savka, M. Plaumann, U. Bommerich, S. Bothe, Torsten Gutmann,
    T. Ratajczyk, et al. “Substituent Influences on the NMR Signal Amplification of
    Ir Complexes with Heterocyclic Carbene Ligands.” <i>Applied Magnetic Resonance</i>
    50, no. 7 (2019): 895–902. <a href="https://doi.org/10.1007/s00723-019-01115-x">https://doi.org/10.1007/s00723-019-01115-x</a>.'
  ieee: 'S. Hadjiali <i>et al.</i>, “Substituent Influences on the NMR Signal Amplification
    of Ir Complexes with Heterocyclic Carbene Ligands,” <i>Applied Magnetic Resonance</i>,
    vol. 50, no. 7, pp. 895–902, 2019, doi: <a href="https://doi.org/10.1007/s00723-019-01115-x">10.1007/s00723-019-01115-x</a>.'
  mla: Hadjiali, S., et al. “Substituent Influences on the NMR Signal Amplification
    of Ir Complexes with Heterocyclic Carbene Ligands.” <i>Applied Magnetic Resonance</i>,
    vol. 50, no. 7, 2019, pp. 895–902, doi:<a href="https://doi.org/10.1007/s00723-019-01115-x">10.1007/s00723-019-01115-x</a>.
  short: S. Hadjiali, R. Savka, M. Plaumann, U. Bommerich, S. Bothe, T. Gutmann, T.
    Ratajczyk, J. Bernarding, H.H. Limbach, H. Plenio, G. Buntkowsky, Applied Magnetic
    Resonance 50 (2019) 895–902.
date_created: 2026-02-07T15:40:18Z
date_updated: 2026-02-17T16:17:34Z
doi: 10.1007/s00723-019-01115-x
extern: '1'
intvolume: '        50'
issue: '7'
keyword:
- dynamic nuclear-polarization
- hyperpolarization
- enhancement
- hydrogen induced polarization
- olefin-metathesis catalysts
- parahydrogen-induced polarization
- peptides
- Physics
- sabre
- spectroscopy
language:
- iso: eng
page: 895–902
publication: Applied Magnetic Resonance
publication_identifier:
  issn:
  - 1613-7507
status: public
title: Substituent Influences on the NMR Signal Amplification of Ir Complexes with
  Heterocyclic Carbene Ligands
type: journal_article
user_id: '100715'
volume: 50
year: '2019'
...
---
_id: '63963'
abstract:
- lang: eng
  text: A novel heterogeneous dirhodium catalyst has been synthesized. This stable
    catalyst is constructed from dirhodium acetate dimer (Rh2(OAc)4) units, which
    are covalently linked to amine- and carboxyl-bifunctionalized mesoporous silica
    (SBA-15NH2COOH). It shows good efficiency in catalyzing the cyclopropanation
    reaction of styrene and ethyl diazoacetate (EDA) forming cis- and trans-1-ethoxycarbonyl-2-phenylcyclopropane.
    To characterize the structure of this catalyst and to confirm the successful immobilization,
    heteronuclear solid-state NMR experiments have been performed. The high application
    potential of dynamic nuclear polarization (DNP) NMR for the analysis of binding
    sites in this novel catalyst is demonstrated. Signal-enhanced 13C CP MAS and 15N
    CP MAS techniques have been employed to detect different carboxyl and amine binding
    sites in natural abundance on a fast time scale. The interpretation of the experimental
    chemical shift values for different binding sites has been corroborated by quantum
    chemical calculations on dirhodium model complexes.
author:
- first_name: Torsten
  full_name: Gutmann, Torsten
  id: '118165'
  last_name: Gutmann
- first_name: Jiquan
  full_name: Liu, Jiquan
  last_name: Liu
- first_name: Niels
  full_name: Rothermel, Niels
  last_name: Rothermel
- first_name: Yeping
  full_name: Xu, Yeping
  last_name: Xu
- first_name: Eva
  full_name: Jaumann, Eva
  last_name: Jaumann
- first_name: Mayke
  full_name: Werner, Mayke
  last_name: Werner
- first_name: Hergen
  full_name: Breitzke, Hergen
  last_name: Breitzke
- first_name: Snorri T.
  full_name: Sigurdsson, Snorri T.
  last_name: Sigurdsson
- first_name: Gerd
  full_name: Buntkowsky, Gerd
  last_name: Buntkowsky
citation:
  ama: 'Gutmann T, Liu J, Rothermel N, et al. Natural Abundance 15N NMR by Dynamic
    Nuclear Polarization: Fast Analysis of Binding Sites of a Novel Amine-Carboxyl-Linked
    Immobilized Dirhodium Catalyst. <i>Chemistry A European Journal</i>. 2015;21(9):3798–3805.
    doi:<a href="https://doi.org/10.1002/chem.201405043">10.1002/chem.201405043</a>'
  apa: 'Gutmann, T., Liu, J., Rothermel, N., Xu, Y., Jaumann, E., Werner, M., Breitzke,
    H., Sigurdsson, S. T., &#38; Buntkowsky, G. (2015). Natural Abundance 15N NMR
    by Dynamic Nuclear Polarization: Fast Analysis of Binding Sites of a Novel Amine-Carboxyl-Linked
    Immobilized Dirhodium Catalyst. <i>Chemistry A European Journal</i>, <i>21</i>(9),
    3798–3805. <a href="https://doi.org/10.1002/chem.201405043">https://doi.org/10.1002/chem.201405043</a>'
  bibtex: '@article{Gutmann_Liu_Rothermel_Xu_Jaumann_Werner_Breitzke_Sigurdsson_Buntkowsky_2015,
    title={Natural Abundance 15N NMR by Dynamic Nuclear Polarization: Fast Analysis
    of Binding Sites of a Novel Amine-Carboxyl-Linked Immobilized Dirhodium Catalyst},
    volume={21}, DOI={<a href="https://doi.org/10.1002/chem.201405043">10.1002/chem.201405043</a>},
    number={9}, journal={Chemistry A European Journal}, publisher={WILEY-VCH Verlag},
    author={Gutmann, Torsten and Liu, Jiquan and Rothermel, Niels and Xu, Yeping and
    Jaumann, Eva and Werner, Mayke and Breitzke, Hergen and Sigurdsson, Snorri T.
    and Buntkowsky, Gerd}, year={2015}, pages={3798–3805} }'
  chicago: 'Gutmann, Torsten, Jiquan Liu, Niels Rothermel, Yeping Xu, Eva Jaumann,
    Mayke Werner, Hergen Breitzke, Snorri T. Sigurdsson, and Gerd Buntkowsky. “Natural
    Abundance 15N NMR by Dynamic Nuclear Polarization: Fast Analysis of Binding Sites
    of a Novel Amine-Carboxyl-Linked Immobilized Dirhodium Catalyst.” <i>Chemistry
    A European Journal</i> 21, no. 9 (2015): 3798–3805. <a href="https://doi.org/10.1002/chem.201405043">https://doi.org/10.1002/chem.201405043</a>.'
  ieee: 'T. Gutmann <i>et al.</i>, “Natural Abundance 15N NMR by Dynamic Nuclear Polarization:
    Fast Analysis of Binding Sites of a Novel Amine-Carboxyl-Linked Immobilized Dirhodium
    Catalyst,” <i>Chemistry A European Journal</i>, vol. 21, no. 9, pp. 3798–3805,
    2015, doi: <a href="https://doi.org/10.1002/chem.201405043">10.1002/chem.201405043</a>.'
  mla: 'Gutmann, Torsten, et al. “Natural Abundance 15N NMR by Dynamic Nuclear Polarization:
    Fast Analysis of Binding Sites of a Novel Amine-Carboxyl-Linked Immobilized Dirhodium
    Catalyst.” <i>Chemistry A European Journal</i>, vol. 21, no. 9, WILEY-VCH Verlag,
    2015, pp. 3798–3805, doi:<a href="https://doi.org/10.1002/chem.201405043">10.1002/chem.201405043</a>.'
  short: T. Gutmann, J. Liu, N. Rothermel, Y. Xu, E. Jaumann, M. Werner, H. Breitzke,
    S.T. Sigurdsson, G. Buntkowsky, Chemistry A European Journal 21 (2015) 3798–3805.
date_created: 2026-02-07T15:38:07Z
date_updated: 2026-02-17T16:17:50Z
doi: 10.1002/chem.201405043
extern: '1'
intvolume: '        21'
issue: '9'
keyword:
- heterogeneous catalysis
- immobilized catalyst
- dynamic nuclear polarization
- hyperpolarization
- NMR spectroscopy
language:
- iso: eng
page: 3798–3805
publication: Chemistry A European Journal
publisher: WILEY-VCH Verlag
status: public
title: 'Natural Abundance 15N NMR by Dynamic Nuclear Polarization: Fast Analysis of
  Binding Sites of a Novel Amine-Carboxyl-Linked Immobilized Dirhodium Catalyst'
type: journal_article
user_id: '100715'
volume: 21
year: '2015'
...