Rostock 2019 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 18: Posters 2: Time Resolved Spectroscopy
MO 18.4: Poster
Mittwoch, 13. März 2019, 16:15–18:15, S Foyer LLM
Cooperative effects in Ir, Pt and Pd containing bimetallic complexes — •Tatjana Wall1, Marko Leist2, Werner R. Thiel2, and Markus Gerhards1 — 1Physical Chemistry, TU Kaiserslautern — 2Inorganic Chemistry, TU Kaiserslautern
Bimetallic complexes can show cooperative effects between the metal centers that can influence spectroscopic properties as well as their performance in catalysis. To investigate such effects, absorption and emission spectra of a homologous series of mono- and binuclear transition metal complexes based on (2-dimethylamino)-4-(2-pyrimidinyl)pyrimidine in different solvents were recorded. Furthermore the lifetimes of the excited states were determined by using the time correlated single photon counting (TCSPC) method. Here we represent the results for Ir, Pt and Pd containing complexes. The results are compared with the pure ligand and additionally a comparison with DFT calculations is performed. For both types of complexes, mono- as well as binuclear ones, MLCT (Metal to Ligand Charge Transfer) and ligand centered bands are observed. The shifts of these bands compared to the pure ligand give information about cooperative effects. Lifetime determinations show multiple exponential decays for both emission bands, whereas the pure ligand has a mono-exponential decay. The photophysics of complexes with respect to lifetimes, coordinations and characters of electronically excited states are discussed.