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MO: Fachverband Molekülphysik
MO 14: Photochemistry II
MO 14.2: Vortrag
Mittwoch, 16. März 2022, 14:45–15:00, MO-H6
Transient FTIR spectroscopy after one- and two-colour excitation on a highly luminescent chromium(III) complex — •Pit Boden1, Patrick Di Martino-Fumo1, Gereon Niedner-Schatteburg1, Wolfram Seidel2, and Katja Heinze3 — 1TU Kaiserslautern, Fachbereich Chemie and Research Center Optimas, Germany — 2University of Rostock, Institute of Chemistry, Germany — 3JGU Mainz, Department of Chemistry, Germany
In this contribution[1] the electronic and structural properties of a highly luminescent mononuclear chromium(III) complex with polypyridyl ligands are investigated via luminescence and in particular transient step-scan FTIR spectroscopy at different temperatures.
The relative population of two NIR-emissive energetically close-lying electronically excited doublet states strongly depends on the available thermal energy. In a new kind of two-colour step-scan FTIR experiments the population of the long-lived excited states is further modulated via pump/pump/probe (FTIR) and pump/dump/probe (FTIR) schemes. Hereby, the second pump or dump excitation, following the initial UV pump excitation, is stimulated by an NIR laser pulse with the wavelength being set according to the phosphorescence spectrum. The successful establishment of this new technique is an important step towards investigations on further transition metal complexes.
[1] P. Boden, P. Di Martino-Fumo, G. Niedner-Schatteburg, W. Seidel, K. Heinze, M. Gerhards, Phys. Chem. Chem. Phys. 2021, 23, 13808.