SAMOP 2021 – scientific programme
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MO: Fachverband Molekülphysik
MO 2: Cluster & Complexes
MO 2.6: Talk
Monday, September 20, 2021, 15:15–15:30, H2
Influence of metal and halide substitution on the photophysics of dinuclear copper(I) and silver(I) complexes — •Sophie Steiger1, Pit Boden1, Florian Rehak2, Jasmin Busch3, Stefan Bräse3, Wim Klopper2, Gereon Niedner-Schatteburg1, and Markus Gerhards1 — 1TUK, FB Chemie and Research Center Optimas, Kaiserslautern — 2KIT, Institut für Physikalische Chemie, Karlsruhe — 3KIT, Institut für Organische Chemie, Karlsruhe
This contribution presents the investigation of dinuclear copper and silver complexes with a butterfly shaped M2X2 core (M = Cu, Ag; X = Cl, Br). By systematically exchanging the metal and halide centers, the influence of the metals and halides on the photophysical properties is analyzed by using UV/VIS absorbance and (time-resolved) luminescence spectroscopy. Structural information about the excited states were obtained by time-resolved step-scan FTIR spectroscopy combined with quantum chemical TDDFT calculations. The presented spectroscopic experiments are performed at different temperatures (from 290 K to 5 K) to analyze thermally activated or suppressed photophysical processes (e.g. thermally activated delayed fluorescence, TADF). For the presented complexes, the metal exchange has a huge impact on the radiative deactivation channel and the structure of the excited states, whereas the halide exchange has a much smaller influence. Both copper complexes show a red-shift of the emission band from TADF to phosphorescence while cooling down while a strong increase of the emission intensity without relevant spectral shift is observed for the silver complexes.