Rostock 2019 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 18: Posters 2: Time Resolved Spectroscopy
MO 18.1: Poster
Mittwoch, 13. März 2019, 16:15–18:15, S Foyer LLM
Time-Resolved step-scan FTIR investigations of luminescent first row transition metal complexes — •Pit Boden1, Patrick Di Martino-Fumo1, Sven Otto2, Matthias Dorn2, Claudia Bizzarri3, Katja Heinze2, and Markus Gerhards1 — 1Physical Chemistry, TU Kaiserslautern, Germany — 2Inorganic Chemistry and Analytical Chemistry, JGU Mainz, Germany — 3Organic Chemistry, KIT, Germany
In this contribution, the time-resolved step-scan FTIR technique is used for investigations of highly luminescent first row transition metal complexes in their electronically excited states with lifetimes in the microsecond regime. The vibrational frequencies obtained from this technique, compared with theoretical calculations, allow for a structural assignment of the excited states. The chosen molecular systems include a series of mononuclear Cr3+-complexes with dipyridinium ligands. These NIR-emitting complexes have a very high luminescence quantum yield and two energetically close lying doublet states, where the relative population can be influenced by cooling down a solid sample to at least 20 K or by applying the newly developed double resonance techniques. The analysis is extended to a related V3+-complex. Additionally, a photosensitive mononuclear Cu(I)-complex and its bridged binuclear analogue are investigated. By comparison with theoretical results, the structures of the electronic ground and lowest lying electronically excited state are determined.