SAMOP 2023 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 15: Rotational- and Vibrational-resolution Spectroscopy
MO 15.6: Vortrag
Donnerstag, 9. März 2023, 12:30–12:45, F142
Luminescent and excited state properties of bimetallic coinage metal NHC-complexes — •Daniel Marhöfer1, Pit Boden1, Sophie Steiger1, Christoph Kaub2, Peter Roesky2, and Gereon Niedner-Schatteburg1 — 1Dept. of Chemistry, TUK, Erwin-Schrödinger-Str. 52-54, 67663 Kaiserslautern — 2Institute of Inorganic Chemistry, KIT, 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 series contains the monometallic and the heterobimetallic gold complexes as well as the homobimetallic silver and copper compounds. The luminescence measurements were performed both in potassium bromide matrix and in (conditionally frozen) ethanoic solution. The emission lifetimes were determined via time-correlated single photon counting in the temperature range between 5 K and 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 quantum-chemically calculated lowest energy singlet and triplet states’ vibrational spectra. A pronounced dependence of the excited state IR absorption, the emission colour and the excited state lifetimes on the metal centers could be observed and finally assigned to cooperative effects in specific metal combinations.