Heidelberg 2015 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 12: Photochemistry and Catalysis
MO 12.3: Vortrag
Mittwoch, 25. März 2015, 11:45–12:00, PH/HS1
Time-Resolved Step-Scan FTIR Investigations on Multimetallic Transition Metal Complexes in Solution and in the Solid State — •Manuel Zimmer1, Fabian Rupp1, Daniel Volz2, Wim Klopper2, Rolf Diller1, Stefan Bräse2, Frank Breher2, and Markus Gerhards1 — 1TU Kaiserslautern, 67663 Kaiserslautern — 2Karlsruhe Institute of Technology, 76131 Karlsruhe
Time-resolved (TR) infrared experiments enable the investigation of chemical reactions, photochemical/-physical processes and their kinetic traces. With the step-scan technique we are able to identify electronically excited states and excited state structures by comparison with theoretical results from quantum chemical calculations. Our focus lies on cooperative effects in multimetallic transition metal complexes with 2 to 4 metal centers. Here we present the first TR step-scan FTIR measurements on a trimetallic Pd complex which has been demonstrated to be a potential catalyst for coupling reactions. The complex was investigated in solution (DMSO-d6) in the absence of air. We could determine the emissive electronic state (3A) and the structural arrangement of the complex in the excited state by comparing the excited state IR spectra with (TD-)DFT calculations. The excited state lifetime of the emissive state, which was previously obtained by fluorescence lifetime measurements is confirmed. Furthermore we present results on different dimetallic copper complexes (differing in their ligand systems) in a KBr matrix. We show the capabilities of step-scan measurements in a KBr matrix, a method that is extremely useful for complexes which cannot be investigated in solution.