Erlangen 2018 – scientific programme
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MO: Fachverband Molekülphysik
MO 4: Photochemistry
MO 4.6: Talk
Monday, March 5, 2018, 15:15–15:30, PA 1.150
Time-Resolved step-scan FTIR investigation of transition metal containing complexes — •Patrick Di Martino-Fumo1, Manuel Zimmer1, Sven Otto2, Hanna Wagner3, Frank Breher3, Wim Klopper4, Katja Heinze2, and Markus Gerhards1 — 1Physical Chemistry, TU Kaiserslautern, Germany — 2Inorganic Chemistry and Analytical Chemistry, Johannes Gutenberg University, Germany — 3Inorganic Chemistry, KIT, Germany — 4Physical and Theoretical Chemistry, KIT, Germany
In this contribution, the time-resolved step-scan FTIR technique is used for investigations of transition metal-complexes in their electronically excited states with lifetimes in the microsecond regime. The vibrational frequencies obtained from this technique compared with theoretical predictions allow a structural assignment of the excited states. In addition, the influence of temperature can be investigated due the possibility to cool down a solid sample to at least 20 K, which e.g. results in an increase of lifetimes and an exclusive population of the lowest excited state. The chosen molecular systems include a mononuclear Cr3+-complex with dipyridinium ligands. This complex has a very high luminescence quantum yield and two energetically similar doublet states. Additionally, investigations on a catalytically active multinuclear complex with two ruthenium and three copper ions including tris(3-pyridin-2-yl)pyrazole ligands is presented. By comparison of calculated (DFT) and experimental spectra a significant geometry change between the electronic ground state (singlet) and the excited triplet state can be identified.