SAMOP 2023 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 20: Poster III
MO 20.10: Poster
Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof
Temperature-dependant Luminescence and Step-scan FTIR Investigations of Tetranuclear Cu(I) Complexes — •Sophie Steiger1, Pit Boden1, Jasmin Busch2, Daniel Marhöfer1, Stefan Bräse2, and Gereon Niedner-Schatteburg1 — 1Department of Chemistry, TUK, Germany — 2IOC, KIT, Germany
In this contribution, we present the investigation of the temperature-dependent luminescence and the luminescent states of tetranuclear copper(I) complexes. The investigations were performed by (time-resolved) luminescence and static as well as step-scan FTIR spectroscopy. The measurements were performed in a temperature range of 290 K to 10 or 5 K in KBr matrix or pure powder. The complexes contain a tetranuclear Cu4X4 (X=Cl, Br, I) core and two 2-(diphenylphosphino)-pyridine ligands with or without a methyl substituent in 4-position of the pyridine ring units. As known from previous work[1], the same type of complexes with ligands with a methyl group in 6-position shows a pronounced thermochromism, which was not detected for the Cu4I4 complex with methyl group in 4-position in KBr matrix. The Cu4I4 complex without methyl group shows the thermochromism in powder measurements but it is less resolved in KBr matrix. All other investigated complexes have only slight temperature-dependent shifts in the luminescence. With step-scan FTIR spectroscopy in comparison with quantum chemical calculation, the excited states were assigned to the different excited state structures.
[1] Chem. Eur. J. 2021, 27, 5439-5452.