Kathleen Grabow

Leibniz Institute for Catalysis

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Ursula Bentrup

Leibniz Institute for Catalysis

Angelika Brückner

Leibniz Institute for Catalysis

Matthias Beller

Leibniz Institute for Catalysis

Dirk Hollmann

University of Rostock

Henrik Junge

RWTH Aachen University

Torsten Beweries

Leibniz Institute for Catalysis

Haijun Jiao

Affiliated Zhongshan Hospital of Dalian University

Anke Spannenberg

Leibniz Institute for Catalysis

Monty Kessler

Karlsruhe Institute of Technology

Shaolin Zhou

Central China Normal University

Cooperative Institutions

University of Rostock

Leibniz Institute for Catalysis

Rostocker Zentrum zur Erforschung des Demografischen Wandels

Leibniz Institute for Neurobiology

University of Oregon

Albert Einstein College of Medicine

Leibniz Association

Robert Bosch (Germany)

Ruhr University Bochum

Technische Universität Braunschweig

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Experimental line broadening and line shift coefficients of the acetylene ν1+ν3 band pressurized by hydrogen and deuterium and comparison with calculations

Journal of Molecular Spectroscopy (2009)

Franck Thibault E.P. Fuller Kathleen Grabow J.L. Hardwick Carmen Marcus

Acetylene

Voigt profile

Line (geometry)

10.1016/j.jms.2009.01.011

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Citations (17)

Selective Reduction of Amides to Amines by Boronic Acid Catalyzed Hydrosilylation

Angewandte Chemie (2013)

Yuehui Li Jesús A. Molina de la Torre Kathleen Grabow Ursula Bentrup Kathrin Junge

Vielseitig und metallfrei: Benzothiophen-Boronsäuren katalysieren die Reduktion tertiärer, sekundärer und primärer Amide durch ein Hydrosilan. In der Reaktion wird eine Vielzahl von funktionellen Gruppen toleriert. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

Hydrosilylation

Boronic acid

10.1002/ange.201304495

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Citations (27)

Photocatalytic Hydrogen Production with Copper Photosensitizer–Titanium Dioxide Composites

ChemCatChem (2013)

Michael Karnahl Esteban Mejía Nils Rockstroh Stefanie Tschierlei Shu‐Ping Luo

Abstract A series of heteroleptic copper photosensitizers [( $\widehat{PP}$ )Cu( $\widehat{NN}$ (SO 3 Na) 2 )] + containing sulfonate anchor groups is described. In the presence of titanium dioxide they form composites, which are active photosensitizers in the light driven reduction of protons. Further stabilization of these systems is achieved by encapsulation within a plasma‐polymerized allylamine (PPAAm) layer. The resulting PPAAm‐CuPS‐TiO 2 ‐composites exhibit a strong absorption in the visible region of the light. Photocatalytic hydrogen production is performed by using only non‐noble metals. In the presence of an iron reduction catalyst a maximum turnover number of 2452 is obtained.

Titanium Dioxide

10.1002/cctc.201300459

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Citations (54)

Homogeneous Catalytic Processes Monitored by Combined in Situ ATR-IR, UV–Vis, and Raman Spectroscopy

ACS Catalysis (2014)

Kathleen Grabow Ursula Bentrup

The benefit of coupling in situ spectroscopic methods (attentuated total reflectance-infrared spectroscopy (ATR-IR), Raman, and UV–vis) for the real-time monitoring of homogeneously catalyzed reactions is exemplarily demonstrated on selected examples of use. In this context, the different mode of catalyst action in reduction reactions of imides and amides with phenylsilanes will be discussed. In the iron-catalyzed decomposition of formic acid, different intermediate iron complexes were identified and the inhibiting effect of chloride onto active iron complex formation could be elucidated. Furthermore, it could be shown that in a Lewis acid catalyzed cyclocondensation reaction, the reactant activation proceeds differently with AlCl3 and TiCl4. For the described in situ spectroscopic studies, a versatile setup was used which allows the simultaneous registration of ATR-IR, UV–vis, and Raman spectra in small volumes of solution at different reaction-determined conditions using fiber-optic probes for the each spectroscopy.

Attenuated total reflection

10.1021/cs500363n

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Citations (47)

Highly selective visible light-induced Ti–O bond splitting in an ansa-titanocene dihydroxido complex

Chemical Communications (2015)

Christian Godemann Laura Dura Dirk Hollmann Kathleen Grabow Ursula Bentrup

Irradiation of a substituted ansa-titanocene(IV) dihydroxido complex with visible light induces Ti-O bond dissociation. In contrast to previous studies on structurally similar unbridged complexes, no side reactions are observed and formation of the Ti(III) species is highly selective. The formation of OH radicals was proved using a biradicaloid species.

Visible spectrum

10.1039/c4cc09733e

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Citations (20)

From the Precursor to the Active State: Monitoring Metamorphosis of Electrocatalysts During Water Oxidation by In Situ Spectroscopy

ChemElectroChem (2017)

Dirk Hollmann Nils Rockstroh Kathleen Grabow Ursula Bentrup Jabor Rabeah

Abstract In situ Raman and in situ EPR spectroscopy in combination with electrochemistry have been used to investigate the behavior of mixed cobalt nickel and cobalt copper oxides in the oxygen evolution reaction (OER). All experiments were carried out in homemade electrochemical cells using 0.1 M KOH as the electrolyte. The OER activities vary depending on the annealing conditions of the catalyst precursors, also reflected by different behaviours during the in situ spectroscopic experiments. The different activity of the Co/Ni oxides is most likely related to the formation of either γ‐ or β‐NiO(OH), characterized by distinct features in the Raman spectra. Thus, a higher percentage of β‐NiO(OH) is present in the more active catalyst. A different behaviour of Co/Cu catalysts has been shown by in situ Raman spectroscopy too, but the active phase could not be identified because of missing spectral features. However, in situ EPR spectroscopy revealed the partial dissolution of Cu(II), suggesting the formation of a Co‐enriched oxide/hydroxide surface.

Non-blocking I/O

Nickel oxide

Oxygen evolution

Cobalt hydroxide

Cobalt oxide

10.1002/celc.201700142

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Citations (14)

CCDC 936055: Experimental Crystal Structure Determination

The Cambridge Structural Database (2013)

Dirk Hollmann Kathleen Grabow Haijun Jiao Monty Kessler Anke Spannenberg

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Crystal (programming language)

10.5517/cc10f1bt

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Solar Hydrogen Production by Plasmonic Au–TiO₂ Catalysts: Impact of Synthesis Protocol and TiO₂ Phase on Charge Transfer Efficiency and H₂ Evolution Rates

ACS Catalysis (2015)

Jacqueline B. Priebe Jörg Radnik Alastair J. J. Lennox Marga-Martina Pohl Michael Karnahl

The activity of plasmonic Au–TiO2 catalysts for solar hydrogen production from H2O/MeOH mixtures was found to depend strongly on the support phase (anatase, rutile, brookite, or composites thereof) as well as on specific structural properties caused by the method of Au deposition (sol-immobilization, photodeposition, or deposition–precipitation). Structural and electronic rationale have been identified for this behavior. Using a combination of spectroscopic in situ techniques (EPR, XANES, and UV–vis spectroscopy), the formation of plasmonic Au particles from precursor species was monitored, and the charge-carrier separation and stabilization under photocatalytic conditions was explored in relation to H2 evolution rates. By in situ EPR spectroscopy, it was directly shown that abundant surface vacancies and surface OH groups enhance the stabilization of separated electrons and holes, whereas the enrichment of Ti3+ in the support lattice hampers an efficient electron transport. Under the given experimental conditions, these properties were most efficiently generated by depositing gold particles on anatase/rutile composites using the deposition–precipitation technique.

Brookite

Rutile

10.1021/cs5018375

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Citations (214)

Base‐Free Non‐Noble‐Metal‐Catalyzed Hydrogen Generation from Formic Acid: Scope and Mechanistic Insights

Chemistry - A European Journal (2014)

Dörthe Mellmann Enrico Barsch Matthias Bauer Kathleen Grabow Albert Boddien

Abstract The iron‐catalyzed dehydrogenation of formic acid has been studied both experimentally and mechanistically. The most active catalysts were generated in situ from cationic Fe II /Fe III precursors and tris[2‐(diphenylphosphino)ethyl]phosphine ( 1 , PP 3 ). In contrast to most known noble‐metal catalysts used for this transformation, no additional base was necessary. The activity of the iron catalyst depended highly on the solvent used, the presence of halide ions, the water content, and the ligand‐to‐metal ratio. The optimal catalytic performance was achieved by using [FeH(PP 3 )]BF 4 /PP 3 in propylene carbonate in the presence of traces of water. With the exception of fluoride, the presence of halide ions in solution inhibited the catalytic activity. IR, Raman, UV/Vis, and EXAFS/XANES analyses gave detailed insights into the mechanism of hydrogen generation from formic acid at low temperature, supported by DFT calculations. In situ transmission FTIR measurements revealed the formation of an active iron formate species by the band observed at 1543 cm −1 , which could be correlated with the evolution of gas. This active species was deactivated in the presence of chloride ions due to the formation of a chloro species (UV/Vis, Raman, IR, and XAS). In addition, XAS measurements demonstrated the importance of the solvent for the coordination of the PP 3 ligand.

X-ray absorption spectroscopy

Noble metal

10.1002/chem.201403602

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Citations (53)

ChemInform Abstract: Homogeneous Catalytic Processes Monitored by Combined in situ ATR‐IR, UV‐Vis, and Raman Spectroscopy

ChemInform (2014)

Kathleen Grabow Ursula Bentrup

Abstract Review: 57 refs.

10.1002/chin.201433264

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Citations (0)