@article{52346,
  abstract     = {{Promising cathode materials for fluoride-ion batteries (FIBs) are 3d transition metal containing oxides with Ruddlesden-Popper-type structure. So far, multi-elemental compositions were not investigated, but could alternate electrochemical performance similar to what has been found for cathode materials for lithium-ion batteries. Within this study, we investigate RP type La2Ni0.75Co0.25O4.08 as an intercalation-based active cathode material for all-solid-state FIBs. We determine the structural changes of La2Ni0.75Co0.25O4.08 during fluoride intercalation / de-intercalation by ex-situ X-ray diffraction, which showed that F- insertion leads to transformation of the parent phase to three different phases. Changes in Ni and Co oxidation states and coordination environment were examined by X-ray absorption spectroscopy and magnetic measurements in order to understand the complex reaction behaviour of the phases in detail, showing that the two transition metals behave differently in the charging and discharging process. Under optimized operating conditions, a cycle life of 120 cycles at a critical cut-off capacity of 40 mAh g-1 against Pb/PbF2 was obtained, which is one of the highest observed for intercalation electrode materials in FIBs so far. The average Coulombic efficiencies ranged from 85% to 90%. Thus, La2Ni0.75Co0.25O4.08 could be a promising candidate for cycling-stable high-energy cathode materials for all-solid-state FIBs}},
  author       = {{Vanita, Vanita and Waidha, Aamir Iqbal and Vasala, Sami and Puphal, Pascal and Schoch, Roland and Glatzel, Pieter and Bauer, Matthias and Clemens, Oliver}},
  issn         = {{2050-7488}},
  journal      = {{Journal of Materials Chemistry A}},
  keywords     = {{Xray}},
  number       = {{12}},
  publisher    = {{Royal Society of Chemistry (RSC)}},
  title        = {{{Insights into the First Multi-Transition-Metal Containing Ruddlesden Popper-Type Cathode for all-solid-state Fluoride Ion Batteries}}},
  doi          = {{10.1039/d4ta00704b}},
  year         = {{2024}},
}

@article{60216,
  abstract     = {{Hydride donors such as DIBAL or CuH react with ZnO and ZrO2 via hydrogen spillover. This suggests that hydrogen spillover in catalysts based on these metal oxides may take place via initial hydride transfer and not via proton–electron transfer.}},
  author       = {{Benz, Michael and Bunjaku, Osman and Nowakowski, Michał and Allgaier, Alexander and Biswas, Indro and van Slageren, Joris and Bauer, Matthias and Estes, Deven P.}},
  issn         = {{2044-4753}},
  journal      = {{Catalysis Science & Technology}},
  keywords     = {{Xray}},
  number       = {{20}},
  pages        = {{5854--5863}},
  publisher    = {{Royal Society of Chemistry (RSC)}},
  title        = {{{Hydrogen spillover through hydride transfer: the reaction of ZnO and ZrO2 with strong hydride donors}}},
  doi          = {{10.1039/d4cy00504j}},
  volume       = {{14}},
  year         = {{2024}},
}

@article{54024,
  abstract     = {{Transition metal complexes, particularly copper hydrides, play an important role in various catalytic processes and molecular inorganic chemistry. This study employs synchrotron hard X‐ray spectroscopy to gain insights into the geometric and electronic properties of copper hydrides as potential catalysts for CO2 hydrogenation. The potential of high energy resolution X‐ray absorption near‐edge structure (HERFD‐XANES) and valence‐to‐core X‐ray emission (VtC‐XES) is demonstrated with measurement on Stryker's reagent (Cu6H6) and [Cu3(μ3‐H)(dpmppe)2](PF6)2 (Cu3H), alongside a non‐hydride copper compound (Cu‐I). The XANES analysis reveals that coordination geometries strongly influence the spectra, providing only indirect details about hydride coordination. The VtC‐XES analysis exhibits a distinct signal around 8975 eV, offering a diagnostic tool to identify hydride ligands. Theoretical calculations support and extend these findings by comparing hydride‐containing complexes with their hydride‐free counterparts.}},
  author       = {{Fritsch, Lorena and Rehsies, Pia and Barakat, Wael and Estes, Deven P. and Bauer, Matthias}},
  issn         = {{0947-6539}},
  journal      = {{Chemistry – A European Journal}},
  keywords     = {{Xray}},
  number       = {{36}},
  publisher    = {{Wiley}},
  title        = {{{Detection and Characterization of Hydride Ligands in Copper Complexes by Hard X‐ray Spectroscopy}}},
  doi          = {{10.1002/chem.202400357}},
  volume       = {{30}},
  year         = {{2024}},
}

@article{54969,
  abstract     = {{This work presents a new and facile route for the preparation of iron oxide-based catalysts supported on alumina, which enables the targeted synthesis of catalysts with an increased amount of isolated tetrahedrally coordinated iron centers compared to a conventional impregnation procedure, and therefore leads to an increase in activity for CO oxidation reaction. By a multi-step impregnation–calcination protocol, the catalysts were synthesized with iron loadings of between 1 and 10 wt%, and their catalytic activity was then compared with a 10 wt% loaded catalyst prepared by conventional single impregnation. With a loading of 8 wt%, the presented catalysts showed an improved catalytic activity regarding light-off and full conversion temperatures compared to this reference. Through the application of several analytical methods (PXRD, PDF, DRUVS, SEM, XAFS), the improved catalytic activity can be correlated with an increased amount of isolated iron centers and a significantly reduced fraction of agglomerates or particles.}},
  author       = {{Schlicher, Steffen and Schoch, Roland and Prinz, Nils and Zobel, Mirijam and Bauer, Matthias}},
  issn         = {{2073-4344}},
  journal      = {{Catalysts}},
  keywords     = {{Catalysis}},
  number       = {{7}},
  publisher    = {{MDPI AG}},
  title        = {{{New and Facile Preparation Method for Highly Active Iron Oxide Catalysts for CO Oxidation}}},
  doi          = {{10.3390/catal14070416}},
  volume       = {{14}},
  year         = {{2024}},
}

@article{55999,
  abstract     = {{Clean hydrogen is a key aspect of carbon neutrality, necessitating robust methods for monitoring hydrogen concentration in critical infrastructures like pipelines or power plants. While semiconducting metal oxides such as In2O3 can monitor gas concentrations down to the ppm range, they often exhibit cross-sensitivity to other gases like H2O. In this study, we investigated whether cyclic optical illumination of a gas-sensitive In2O3 layer creates identifiable changes in a gas sensor´s electronic resistance that can be linked to H2 and H2O concentrations via machine learning. We exposed nanostructured In2O3 with a large surface area of 95 m2 g-1 to H2 concentrations (0-800 ppm) and relative humidity (0-70%) under cyclic activation utilizing blue light. The sensors were tested for 20 classes of gas combinations. A support vector machine achieved classification rates up to 92.0%, with reliable reproducibility (88.2 ± 2.7%) across five individual sensors using 10-fold cross-validation. Our findings suggest that cyclic optical activation can be used as a tool to classify H2 and H2O concentrations.}},
  author       = {{Baier, Dominik  and Krüger, Alexander  and Wagner, Thorsten  and Tiemann, Michael and Weinberger, Christian}},
  issn         = {{2227-9040}},
  journal      = {{Chemosensors}},
  keywords     = {{resistive gas sensor, chemiresistor, semiconductor, metal oxide, In2O3, mesoporous, hydrogen, humidtiy, machine learning, sustainable}},
  number       = {{9}},
  pages        = {{178}},
  publisher    = {{MDPI}},
  title        = {{{Gas Sensing with Nanoporous In2O3 under Cyclic Optical Activation: Machine Learning-Aided Classification of H2 and H2O}}},
  doi          = {{10.3390/chemosensors12090178}},
  volume       = {{12}},
  year         = {{2024}},
}

@article{52345,
  abstract     = {{Photoactive chromium(III) complexes saw a conceptual breakthrough with the discovery of the prototypical molecular ruby mer-[Cr(ddpd)2]3+ (ddpd = N,N′-dimethyl-N,N′-dipyridin-2-ylpyridine-2,6-diamine), which shows intense long-lived near-infrared (NIR) phosphorescence from metal-centered spin-flip states. In contrast to the numerous studies on chromium(III) photophysics, only 10 luminescent molybdenum(III) complexes have been reported so far. Here, we present the synthesis and characterization of mer-MoX3(ddpd) (1, X = Cl; 2, X = Br) and cisfac-[Mo(ddpd)2]3+ (cisfac-[3]3+), an isomeric heavy homologue of the prototypical molecular ruby. For cisfac-[3]3+, we found strong zero-field splitting using magnetic susceptibility measurements and electron paramagnetic resonance spectroscopy. Electronic spectra covering the spin-forbidden transitions show that the spin-flip states in mer-1, mer-2, and cisfac-[3]3+ are much lower in energy than those in comparable chromium(III) compounds. While all three complexes show weak spin-flip phosphorescence in NIR-II, the emission of cisfac-[3]3+ peaking at 1550 nm is particularly low in energy. Femtosecond transient absorption spectroscopy reveals a short excited-state lifetime of 1.4 ns, 6 orders of magnitude shorter than that of mer-[Cr(ddpd)2]3+. Using density functional theory and ab initio multireference calculations, we break down the reasons for this disparity and derive principles for the design of future stable photoactive molybdenum(III) complexes.}},
  author       = {{Kitzmann, Winald R. and Hunger, David and Reponen, Antti-Pekka M. and Förster, Christoph and Schoch, Roland and Bauer, Matthias and Feldmann, Sascha and van Slageren, Joris and Heinze, Katja}},
  issn         = {{0020-1669}},
  journal      = {{Inorganic Chemistry}},
  keywords     = {{Inorganic Chemistry, Physical and Theoretical Chemistry}},
  number       = {{39}},
  pages        = {{15797--15808}},
  publisher    = {{American Chemical Society (ACS)}},
  title        = {{{Electronic Structure and Excited-State Dynamics of the NIR-II Emissive Molybdenum(III) Analogue to the Molecular Ruby}}},
  doi          = {{10.1021/acs.inorgchem.3c02186}},
  volume       = {{62}},
  year         = {{2023}},
}

@phdthesis{53434,
  abstract     = {{Im Rahmen dieser Dissertation wurden Katalysatoren, welche auf der thermischen Zersetzung von metallorganischen Gerüstverbindungen basieren, mittels Röntgenabsorptionsspektroskopie (XAS) und Röntgenemissionsspektroskopie (XES) untersucht. Durch diesen synthetischen Ansatz können hochdisperse Ni-basierte Katalysatoren eingebettet in einer Kohlenstoffmatrix gewonnen werden, welche für die Methanisierung von CO2 Einsatz finden. Diese sollen eine hohe Stabilität gegenüber Wasserstoffausfällen aufweisen, welche bedingt durch Wetterfluktuationen in der Gewinnung von grünem Wasserstoff auftreten. Um ein derartiges System gezielt gestalten zu können, ist ein detailliertes Verständnis zugrundeliegender chemischer Mechanismen und damit einhergehend elektronischer Strukturen der Katalysatorsysteme notwendig. Durch die detaillierte Analyse der Katalysator-Vorstufen mittels XAS konnte gezeigt werden, dass auch unter reduktiven Bedingungen in der thermischen Zersetzung Spuren von Ni(II) vorliegen und keine reine Nifcc-Struktur erreicht werden konnte. Eine detaillierte Auswertung der gleichen Präkatalysatoren mittels XES konnte durch eine neuartige Kombination von HERFD-XANES, theoretischer Berechnungen und VtC-XES einen eindeutigen Beweis für das Vorhandensein der gewünschten Kohlenstoffmatrix sowie Spuren von NiO im Präkatalysator liefern, welche sich vorteilhaft auf die spätere Aktivität im finalen Katalysator auswirken. Abschließend konnte mittels einer in-situ Untersuchung der Temperaturbereich, in dem sich die aktive Katalysatorspezies ausbildet, auf 80 bis 200 C eingegrenzt werden. Schließlich konnte ein eindeutiger Zusammenhang zwischen dem Verlust einer stabilisierenden Kohlenstoffschicht und einem Rückgang der Aktivität belegt werden.}},
  author       = {{Strübbe, Sven}},
  pages        = {{198}},
  publisher    = {{Universitätsbibliothek Paderborn}},
  title        = {{{Investigations of Ni-based methanation catalysts under dynamic conditions via hard X-ray spectroscopy}}},
  doi          = {{10.17619/UNIPB/1-1752}},
  year         = {{2023}},
}

@article{52344,
  abstract     = {{Macrocyclization reactions are still challenging due to competing oligomerization, which requires the use of small substrate concentrations. Here, the cationic tungsten imido and tungsten oxo alkylidene N-heterocyclic carbene complexes [[W(N-2,6-Cl2-C6H3)(CHCMe2Ph(OC6F5)(pivalonitrile)(IMes)+ B(ArF)4−] (W1) and [W(O)(CHCMe2Ph(OCMe(CF3)2)(IMes)(CH3CN)+ B(ArF)4−] (W2) (IMes=1,3-dimesitylimidazol-2-ylidene; B(ArF)4−=tetrakis(3,5-bis(trifluoromethyl)phenyl borate) have been immobilized inside the pores of ordered mesoporous silica (OMS) with pore diameters of 3.3 and 6.8 nm, respectively, using a pore-selective immobilization protocol. X-ray absorption spectroscopy of W1@OMS showed that even though the catalyst structure is contracted due to confinement by the mesopores, both the oxidation state and structure of the catalyst stayed intact upon immobilization. Catalytic testing with four differently sized α,ω-dienes revealed a dramatically increased macrocyclization (MC) and Z-selectivity of the supported catalysts compared to the homogenous progenitors, allowing high substrate concentrations of 25 mM. With the supported complexes, a maximum increase in MC-selectivity from 27 to 81 % and in Z-selectivity from 17 to 34 % was achieved. In general, smaller mesopores exhibited a stronger confinement effect. A comparison of the two supported tungsten-based catalysts showed that W1@OMS possesses a higher MC-selectivity, while W2@OMS exhibits a higher Z-selectivity which can be rationalized by the structures of the catalysts.}},
  author       = {{Ziegler, Felix and Bruckner, Johanna R. and Nowakowski, Michał and Bauer, Matthias and Probst, Patrick and Atwi, Boshra and Buchmeiser, Michael R.}},
  issn         = {{1867-3880}},
  journal      = {{ChemCatChem}},
  keywords     = {{Inorganic Chemistry, Organic Chemistry, Physical and Theoretical Chemistry, Catalysis}},
  number       = {{21}},
  publisher    = {{Wiley}},
  title        = {{{Macrocyclization of Dienes under Confinement with Cationic Tungsten Imido/Oxo Alkylidene <i>N</i>‐Heterocyclic Carbene Complexes}}},
  doi          = {{10.1002/cctc.202300871}},
  volume       = {{15}},
  year         = {{2023}},
}

@article{42679,
  abstract     = {{The Saharan desert ant Cataglyphis bombycina is densely covered with shiny silver setae (hair-like structures). Their appearance was explained by geometric optics and total internal reflection. The setae also increase the emissivity of the ant, as they form an effective medium. This work provides additional data on microstructural details of the setae that are used to simulate the scattering of an individual seta to explain their influence on the optical properties. This is achieved by characterization of their structure using light microscopy and scanning/transmission electron microscopy. How the microstructural features influence scattering is investigated wave-optically within the limits of finite-difference time-domain simulations from the ultraviolet to the mid-infrared spectral range to elucidate the optical effects beyond ray optics and effective medium theory. The results show that Mie scattering plays an important role in protecting the ant from solar radiation and could be relevant for its thermal tolerance.}},
  author       = {{Schwind, Bertram and Wu, Xia and Tiemann, Michael and Fabritius, Helge-Otto}},
  issn         = {{0740-3224}},
  journal      = {{Journal of the Optical Society of America B}},
  keywords     = {{Atomic and Molecular Physics, and Optics, Statistical and Nonlinear Physics}},
  number       = {{3}},
  pages        = {{B49 -- B58}},
  publisher    = {{Optica Publishing Group}},
  title        = {{{Broadband Mie scattering effects by structural features of setae from the Saharan silver ant Cataglyphis bombycina}}},
  doi          = {{10.1364/josab.474899}},
  volume       = {{40}},
  year         = {{2023}},
}

@article{46481,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>Although iron is a dream candidate to substitute noble metals in photoactive complexes, realization of emissive and photoactive iron compounds is demanding due to the fast deactivation of their charge-transfer states. Emissive iron compounds are scarce and dual emission has not been observed before. Here we report the Fe<jats:sup>III</jats:sup> complex [Fe(ImP)<jats:sub>2</jats:sub>][PF<jats:sub>6</jats:sub>] (HImP = 1,1′-(1,3-phenylene)bis(3-methyl-1-imidazol-2-ylidene)), showing a Janus-type dual emission from ligand-to-metal charge transfer (LMCT)- and metal-to-ligand charge transfer (MLCT)-dominated states. This behaviour is achieved by a ligand design that combines four <jats:italic>N</jats:italic>-heterocyclic carbenes with two cyclometalating aryl units. The low-lying <jats:italic>π</jats:italic>* levels of the cyclometalating units lead to energetically accessible MLCT states that cannot evolve into LMCT states. With a lifetime of 4.6 ns, the strongly reducing and oxidizing MLCT-dominated state can initiate electron transfer reactions, which could constitute a basis for future applications of iron in photoredox catalysis.</jats:p>}},
  author       = {{Steube, Jakob and Kruse, Ayla and Bokareva, Olga S. and Reuter, Thomas and Demeshko, Serhiy and Schoch, Roland and Argüello Cordero, Miguel A. and Krishna, Athul and Hohloch, Stephan and Meyer, Franc and Heinze, Katja and Kühn, Oliver and Lochbrunner, Stefan and Bauer, Matthias}},
  issn         = {{1755-4330}},
  journal      = {{Nature Chemistry}},
  keywords     = {{General Chemical Engineering, General Chemistry}},
  number       = {{4}},
  pages        = {{468--474}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Janus-type emission from a cyclometalated iron(iii) complex}}},
  doi          = {{10.1038/s41557-023-01137-w}},
  volume       = {{15}},
  year         = {{2023}},
}

@article{43457,
  abstract     = {{The production of hydrogen and the utilization of biomass for sustainable concepts of energy conversion and storage require gas sensors that discriminate between hydrogen (H2) and carbon monoxide (CO). Mesoporous copper–ceria (Cu–CeO2) materials with large specific surface areas and uniform porosity are prepared by nanocasting, and their textural properties are characterized by N2 physisorption, powder XRD, scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The oxidation states of copper (Cu+, Cu2+) and cerium (Ce3+, Ce4+) are investigated by XPS. The materials are used as resistive gas sensors for H2 and CO. The sensors show a stronger response to CO than to H2 and low cross-sensitivity to humidity. Copper turns out to be a necessary component; copper-free ceria materials prepared by the same method show only poor sensing performance. By measuring both gases (CO and H2) simultaneously, it is shown that this behavior can be utilized for selective sensing of CO in the presence of H2.}},
  author       = {{Baier, Dominik and Priamushko, Tatiana and Weinberger, Christian and Kleitz, Freddy and Tiemann, Michael}},
  issn         = {{2379-3694}},
  journal      = {{ACS Sensors}},
  keywords     = {{Fluid Flow and Transfer Processes, Process Chemistry and Technology, Instrumentation, Bioengineering}},
  number       = {{4}},
  pages        = {{1616 -- 1623}},
  publisher    = {{American Chemical Society (ACS)}},
  title        = {{{Selective Discrimination between CO and H2 with Copper–Ceria-Resistive Gas Sensors}}},
  doi          = {{10.1021/acssensors.2c02739}},
  volume       = {{8}},
  year         = {{2023}},
}

@article{40981,
  abstract     = {{Room temperature sodium-sulfur (RT Na-S) batteries are considered potential candidates for stationary power storage applications due to their low cost, broad active material availability and low toxicity. Challenges, such as high volume expansion of the S-cathode upon discharge, low electronic conductivity of S as active material and herewith limited rate capability as well as the shuttling of polysulfides (PSs) as intermediates often impede the cycle stability and practical application of Na-S batteries. Sulfurized poly(acrylonitrile) (SPAN) inherently inhibits the shuttling of PSs and shows compatibility with carbonate-based electrolytes, however, its exact redox mechanism remained unclear to date. Herein, we implement a commercially available and simple electrolyte into the Na-SPAN cell chemistry and demonstrate its high rate and cycle stability. Through the application of in situ techniques utilizing electronic impedance spectroscopy (EIS) and X-ray absorption spectroscopy (XAS) at different depths of charge and discharge, an insight into SPAN’s redox chemistry is obtained.}},
  author       = {{Kappler, Julian and Tonbul, Güldeniz and Schoch, Roland and Murugan, Saravanakumar and Nowakowski, Michał and Lange, Pia Lena and Klostermann, Sina Vanessa and Bauer, Matthias and Schleid, Thomas and Kästner, Johannes and Buchmeiser, Michael Rudolf}},
  issn         = {{0013-4651}},
  journal      = {{Journal of The Electrochemical Society}},
  keywords     = {{Materials Chemistry, Electrochemistry, Surfaces, Coatings and Films, Condensed Matter Physics, Renewable Energy, Sustainability and the Environment, Electronic, Optical and Magnetic Materials}},
  number       = {{1}},
  publisher    = {{The Electrochemical Society}},
  title        = {{{Understanding the Redox Mechanism of Sulfurized Poly(acrylonitrile) as Highly Rate and Cycle Stable Cathode Material for Sodium-Sulfur Batteries}}},
  doi          = {{10.1149/1945-7111/acb2fa}},
  volume       = {{170}},
  year         = {{2023}},
}

@inproceedings{44380,
  author       = {{Tonbul, Güldeniz and Kappler, Julian  and Murugan, Saravanakumar  and Schoch, Roland  and Nowakowski, Michal  and Lange, Pia and Bauer, Matthias  and Buchmeiser, Michael R.}},
  location     = {{Aachen}},
  title        = {{{Characterization of Na-S Battery System Using X-ray Absorption Spectroscopy}}},
  year         = {{2023}},
}

@article{44837,
  abstract     = {{Hydrothermal carbonization (HTC) is an efficient thermochemical method for the conversion of organic feedstock to carbonaceous solids. HTC of different saccharides is known to produce microspheres (MS) with mostly Gaussian size distribution, which are utilized as functional materials in various applications, both as pristine MS and as a precursor for hard carbon MS. Although the average size of the MS can be influenced by adjusting the process parameters, there is no reliable mechanism to affect their size distribution. Our results demonstrate that HTC of trehalose, in contrast to other saccharides, results in a distinctly bimodal sphere diameter distribution consisting of small spheres with diameters of (2.1 ± 0.2) μm and of large spheres with diameters of (10.4 ± 2.6) μm. Remarkably, after pyrolytic post-carbonization at 1000 °C the MS develop a multimodal pore size distribution with abundant macropores > 100 nm, mesopores > 10 nm and micropores < 2 nm, which were examined by small-angle X-ray scattering and visualized by charge-compensated helium ion microscopy. The bimodal size distribution and hierarchical porosity provide an extraordinary set of properties and potential variables for the tailored synthesis of hierarchical porous carbons, making trehalose-derived hard carbon MS a highly promising material for applications in catalysis, filtration, and energy storage devices.}},
  author       = {{Wortmann, Martin and Keil, Waldemar and Diestelhorst, Elise and Westphal, Michael and Haverkamp, René and Brockhagen, Bennet and Biedinger, Jan and Bondzio, Laila and Weinberger, Christian and Baier, Dominik and Tiemann, Michael and Hütten, Andreas and Hellweg, Thomas and Reiss, Günter and Schmidt, Claudia and Sattler, Klaus and Frese, Natalie}},
  issn         = {{2046-2069}},
  journal      = {{RSC Advances}},
  keywords     = {{General Chemical Engineering, General Chemistry}},
  number       = {{21}},
  pages        = {{14181--14189}},
  publisher    = {{Royal Society of Chemistry (RSC)}},
  title        = {{{Hard carbon microspheres with bimodal size distribution and hierarchical porosity <i>via</i> hydrothermal carbonization of trehalose}}},
  doi          = {{10.1039/d3ra01301d}},
  volume       = {{13}},
  year         = {{2023}},
}

@article{44116,
  abstract     = {{Faradaic reactions including charge transfer are often accompanied with diffusion limitation inside the bulk. Conductive two-dimensional frameworks (2D MOFs) with a fast ion transport can combine both - charge transfer and fast diffusion inside their porous structure. To study remaining diffusion limitations caused by particle morphology, different synthesis routes of Cu-2,3,6,7,10,11-hexahydroxytriphenylene (Cu3(HHTP)2), a copper-based 2D MOF, are used to obtain flake- and rod-like MOF particles. Both morphologies are systematically characterized and evaluated for redox-active Li+ ion storage. The redox mechanism is investigated by means of X-ray absorption spectroscopy, FTIR spectroscopy and in situ XRD. Both types are compared regarding kinetic properties for Li+ ion storage via cyclic voltammetry and impedance spectroscopy. A significant influence of particle morphology for 2D MOFs on kinetic aspects of electrochemical Li+ ion storage can be observed. This study opens the path for optimization of redox active porous structures to overcome diffusion limitations of Faradaic processes.}},
  author       = {{Wrogemann, Jens Matthies and Lüther, Marco Joes and Bärmann, Peer and Lounasvuori, Mailis and Javed, Ali and Tiemann, Michael and Golnak, Ronny and Xiao, Jie and Petit, Tristan and Placke, Tobias and Winter, Martin}},
  issn         = {{1433-7851}},
  journal      = {{Angewandte Chemie International Edition}},
  keywords     = {{General Chemistry, Catalysis}},
  number       = {{26}},
  pages        = {{e202303111}},
  publisher    = {{Wiley}},
  title        = {{{Overcoming Diffusion Limitation of Faradaic Processes: Property‐Performance Relationships of 2D Conductive Metal‐Organic Framework Cu3(HHTP)2 for Reversible Lithium‐Ion Storage}}},
  doi          = {{10.1002/anie.202303111}},
  volume       = {{62}},
  year         = {{2023}},
}

@unpublished{40982,
  abstract     = {{Effective photoinduced charge transfer makes molecular bimetallic assemblies attractive for applications as active light induced proton reduction systems. For a more sustainable future, development of competitive base metal dyads is mandatory. However, the electron transfer mechanisms from the photosensitizer to the proton reduction catalyst in base metal dyads remain so far unexplored. We study a Fe-Co dyad that exhibits photocatalytic H2 production activity using femtosecond X-ray emission spectroscopy, complemented by ultrafast optical spectroscopy and theoretical time-dependent DFT calculations, to understand the electronic and structural dynamics after photoexcitation and during the subsequent charge transfer process from the FeII photosensitizer to the cobaloxime catalyst. Using this novel approach, the simultaneous measurement of the transient Kalpha X-ray emission at the iron and cobalt K-edges in a two-colour experiment is enabled making it possible to correlate the excited state dynamics to the electron transfer processes. The methodology, therefore, provides a clear and direct spectroscopic evidence of the Fe->Co electron transfer responsible for the proton reduction activity.}},
  author       = {{Nowakowski, Michał and Huber-Gedert, Marina and Elgabarty, Hossam and Kubicki, Jacek and Kertem, Ahmet and Lindner, Natalia and Khakhulin, Dimitry and Lima, Frederico Alves and Choi, Tae-Kyu and Biednov, Mykola and Piergies, Natalia and Zalden, Peter and Kubicek, Katerina and Rodriguez-Fernandez, Angel and Salem, Mohammad Alaraby and Kühne, Thomas and Gawelda, Wojciech and Bauer, Matthias}},
  booktitle    = {{arxiv}},
  title        = {{{Ultrafast two-colour X-ray emission spectroscopy reveals excited state landscape in a base metal dyad}}},
  year         = {{2023}},
}

@article{52343,
  abstract     = {{Improved enantioselectivity in the 1,2-addition was observed for chiral Rh norbornadiene catalysts immobilized on ordered mesoporous silica with small pores. Confinement effects were rationalized by experimental and computational studies.}},
  author       = {{Kirchhof, Manuel and Gugeler, Katrin and Beurer, Ann-Katrin and Fischer, Felix Richard and Batman, Derman and Bauch, Soeren M. and Kolin, Sofia and Nicholas, Elliot and Schoch, Roland and Vogler, Charlotte and Kousik, Shravan R. and Zens, Anna and Plietker, Bernd and Atanasova, Petia and Naumann, Stefan and Bauer, Matthias and Bruckner, Johanna R. and Traa, Yvonne and Kästner, Johannes and Laschat, Sabine}},
  issn         = {{2044-4753}},
  journal      = {{Catalysis Science Technology}},
  keywords     = {{Catalysis}},
  number       = {{12}},
  pages        = {{3709--3724}},
  publisher    = {{Royal Society of Chemistry (RSC)}},
  title        = {{{Tethering chiral Rh diene complexes inside mesoporous solids: experimental and theoretical study of substituent, pore and linker effects on asymmetric catalysis}}},
  doi          = {{10.1039/d3cy00381g}},
  volume       = {{13}},
  year         = {{2023}},
}

@article{49608,
  abstract     = {{<jats:p>The effects of backbone amine functionalization in three new homoleptic C^N^C type ruthenium(II) complexes bearing a tridentate bis‐imidazole‐2‐ylidene pyridine ligand framework are characterized and studied by single crystal diffraction, electrochemistry, optical spectroscopy and transient absorption spectroscopy in combination with ab initio DFT calculations. Functionalization by dimethylamine groups in 4‐position of the pyridine backbone significantly influences the properties of the complexes as revealed by comparison with the unfunctionalized references. As a result of the amine functionalization, a higher molar absorption coefficient of the MLCT bands, a decreased photoluminescence quantum yield at room temperature together with a shortened excited state lifetime but an improved photostability is observed. Introduction of electron donating and withdrawing groups at the NHC unit modifies the electronic and optical properties, such as the oxidation potential, absorption and emission properties, and the lifetimes of the excited states.</jats:p>}},
  author       = {{Fritsch, Lorena and Vukadinovic, Yannik and Lang, Moritz and Naumann, Robert and Bertrams, Maria-Sophie and Kruse, Ayla and Schoch, Roland and Müller, Patrick and Neuba, Adam and Dierks, Philipp and Lochbrunner, Stefan and Kerzig, Christoph and Heinze, Katja and Bauer, Matthias}},
  issn         = {{2367-0932}},
  journal      = {{ChemPhotoChem}},
  keywords     = {{Photo}},
  publisher    = {{Wiley}},
  title        = {{{Chemical and photophysical properties of amine functionalized bis‐NHC‐pyridine‐Ru(II) complexes}}},
  doi          = {{10.1002/cptc.202300281}},
  year         = {{2023}},
}

@article{40986,
  abstract     = {{Currently, chemistry and physics are strongly dependent on the concept of the oxidation state. While the formal oxidation state is easily evaluated, the real physical oxidation state value is often difficult to determine and significantly varies from the formal values. Determination of the ionization threshold in X-ray absorption spectroscopy (XANES) relies on the absorption edge position and sometimes poses limitations, mainly due to the edge resonances. Moreover, the lower energy states can be probed only within x-soft or XUV photons providing only surface state information of probed materials. Here, we employ high energy resolution off-resonant spectroscopy to determine both 1s and 3p binding energies of Fe-based materials and therefore correlate to their physical oxidation state. The results are compared to the ones obtained with classical X-ray absorption, X-ray emission, and photoelectron spectroscopies. The observed differences in binding energies are discussed in a frame of initial and final state interactions with the atom's electronic configurations. The presented methodology is discussed towards potential use to single-shot experiments and application at X-ray free-electron lasers. Alternatively, core level X-ray emission spectroscopy can be used, but the emission line positions are strongly affected by spin-orbit interaction. However, due to the energy transfer from the photon to the excited core electron, the same information as in XANES is probed in high energy resolution off-resonant spectroscopy (HEROS). Based on the Kramers–Heisenberg theory, we propose a new approach for ionization threshold determination which is free of the limitations encountered in XANES-based determination of the core state energy. Namely, the value of core state energy can be determined analytically using a few HEROS spectra recorded with significantly higher spectral resolution. This approach provides a basis for the universal physical oxidation state determination method.}},
  author       = {{Nowakowski, Michał and Kalinko, Aleksandr and Szlachetko, Jakub and Fanselow, Rafał and Bauer, Matthias}},
  issn         = {{0267-9477}},
  journal      = {{Journal of Analytical Atomic Spectrometry}},
  keywords     = {{Spectroscopy, Analytical Chemistry}},
  number       = {{11}},
  pages        = {{2383--2391}},
  publisher    = {{Royal Society of Chemistry (RSC)}},
  title        = {{{High resolution off resonant spectroscopy as a probe of the oxidation state}}},
  doi          = {{10.1039/d2ja00232a}},
  volume       = {{37}},
  year         = {{2022}},
}

@article{40988,
  abstract     = {{Increasing the metal-to-ligand charge transfer (MLCT) excited state lifetime of polypyridine iron(II) complexes can be achieved by lowering the ligand's π* orbital energy and by increasing the ligand field splitting. In the homo- and heteroleptic complexes [Fe(cpmp)2]2+ (12+) and [Fe(cpmp)(ddpd)]2+ (22+) with the tridentate ligands 6,2’’-carboxypyridyl-2,2’-methylamine-pyridyl-pyridine (cpmp) and N,N’-dimethyl-N,N’-di-pyridin-2-ylpyridine-2,6-diamine (ddpd) two or one dipyridyl ketone moieties provide low energy π* acceptor orbitals. A good metal-ligand orbital overlap to increase the ligand field splitting is achieved by optimizing the octahedricity through CO and NMe units between the coordinating pyridines which enable the formation of six-membered chelate rings. The push-pull ligand cpmp provides intra-ligand and ligand-to-ligand charge transfer (ILCT, LL'CT) excited states in addition to MLCT excited states. Ground and excited state properties of 12+ and 22+ were accessed by X-ray diffraction analyses, resonance Raman spectroscopy, (spectro)electrochemistry, EPR spectroscopy, X-ray emission spectroscopy, static and time-resolved IR and UV/Vis/NIR absorption spectroscopy as well as quantum chemical calculations.}},
  author       = {{Weber, Sebastian and Zimmermann, Ronny T. and Bremer, Jens and Abel, Ken L. and Poppitz, David and Prinz, Nils and Ilsemann, Jan and Wendholt, Sven and Yang, Qingxin and Pashminehazar, Reihaneh and Monaco, Federico and Cloetens, Peter and Huang, Xiaohui and Kübel, Christian and Kondratenko, Evgenii and Bauer, Matthias and Bäumer, Marcus and Zobel, Mirijam and Gläser, Roger and Sundmacher, Kai and Sheppard, Thomas L.}},
  issn         = {{1867-3880}},
  journal      = {{ChemCatChem}},
  keywords     = {{Inorganic Chemistry, Organic Chemistry, Physical and Theoretical Chemistry, Catalysis}},
  number       = {{8}},
  publisher    = {{Wiley}},
  title        = {{{Digitization in Catalysis Research: Towards a Holistic Description of a Ni/Al2O3 Reference Catalyst for CO2 Methanation}}},
  doi          = {{10.1002/cctc.202101878}},
  volume       = {{14}},
  year         = {{2022}},
}