Erlangen 2018 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 22: Posters 3: Experimental and Theoretical Techniques and High Resolution Spectroscopy
MO 22.19: Poster
Donnerstag, 8. März 2018, 16:15–18:15, Zelt West
Electronic structure investigations on mono- and binu-clear transition metal complexes — •Tatjana Wall1, Louis Oberweis1, Marko Leist2, Werner Thiel2, and Markus Gerhards1 — 1TU Kaiserslautern, Physical Chemistry & Research Center Optimas, Erwin-Schrödinger-Str. 52, 67663 Kaiserslautern, Germany — 2TU Kaiserslautern, Inorganic Chemistry, Erwin-Schrödinger-Str. 54, 67663 Kaiserslautern, Germany
Binuclear heterometallic complexes are of great interest in synthesis due to their catalytical activity e.g. for transfer hydrogenation or cross-couplig. Absorption and emission spectra of mono- and binuclear transition metal complexes based on bispyrimidine in solution are recorded to investigate their electronic structure. Furthermore the lifetimes of the excited states are determined by using the time correlated single photon counting (TCSPC) method. The results are compared with the pure bispyrimidine ligand and additionally a comparison with DFT calculations is performed. Here we represent the results for mono- and binuclear Ir and Pd containing complexes. For both types of complexes MLCT (Metal to Ligand Charge Transfer) and ligand centered transitions are observed. Lifetime determinations show multiple exponential decays for all emission bands, whereas the emission band of the pure ligand has a mono-exponential decay. The average lifetimes of the ligand centered bands are similar to the lifetime of the pure ligand. The photophysics of complexes with respect to lifetimes, coordination sites and characters of electronically excited states are discussed.