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MO: Fachverband Molekülphysik
MO 8: Poster 1
MO 8.24: Poster
Tuesday, March 15, 2022, 16:30–18:30, P
Luminescent and excited state properties of bimetallic coinage metal NHC-complexes — •Daniel Marhöfer1, Pit Boden1, Sophie Steiger1, Christoph Kaub2, Peter Roesky2, Gereon Niedner-Schatteburg1, and Markus Gerhards1 — 1Department of Chemistry, TU Kaiserslautern, Erwin-Schrödinger-Str. 52-54, 67663 Kaiserslautern — 2Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstr. 15, 76131 Karlsruhe
A series of bimetallic coinage metal complexes containing a specific, bipyridyl substituted, N-heterocyclic carbene ligand was investigated via luminescence spectroscopy as well as step-scan FTIR spectroscopy. The emission lifetimes of the different bimetallic compounds as well as the underlying monometallic gold complex and the free ligand itself embedded in a potassium bromide matrix were determined by time-correlated single photon counting in the temperature range of 5 K - 290 K. The excited state structures were studied by electronic excitation by a pulsed UV laser followed by step-scan FTIR probing, allowing the determination of the IR absorption of the electronically excited molecules. The obtained excited state spectra were then compared to both the ground state vibrational spectrum as well as the excited state IR spectra of the other complexes of the series. A pronounced dependence of the excited state IR absorption, the emission colour and the excited state lifetimes on the metal centers could be observed.