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MO: Fachverband Molekülphysik
MO 21: Ultrafast Dynamics II
MO 21.5: Vortrag
Donnerstag, 14. März 2024, 15:30–15:45, HS 3044
Photophysical and photochemical investigations on a series of group VI carbonyl complexes with a meso-ionic carbene ligand — •Daniel Marhöfer1, Pit Boden1, Tobias Benz2, Sophie Steiger1, Biprajit Sarkar2, and Gereon Niedner-Schatteburg1 — 1Department of Chemistry and Research Center Optimas, RPTU Kaiserslautern-Landau, Erwin-Schrödinger-Straße 52, 67663 Kaiserslautern, Germany. — 2University of Stuttgart, Chair of Inorganic Coordination Chemistry, Institute of Inorganic Chemistry, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
Photo-catalysis is a well-explored field in contemporary research. It enables reactions under comparably mild conditions, that wouldn't otherwise take place. A drawback of most photo-catalysts is the requirement for rare metals as late transition metals or even rare earth metals. In order to make this field of research more sustainable and economical, it is of particular interest to develop photo-catalysts, that contain only earth-abundant metals.
In this work we present a series of Cr(0), Mo(0) and W(0) carbonyl complexes that are able to stereo-selectively cleave a CO ligand under irradiation and recombine in the dark thereafter both in the solid phase and in solution. The photophysical behavior regarding emission and excited state vibrations as well as the respective excited state lifetimes was investigated on using luminescence spectroscopy and step-scan spectroscopy. The results were compared to previously reported, isomeric complexes and backed up by DFT calculations.
Keywords: Meso-ionic carbene; Photophysics; Photochemistry; Transition metal; Time-resolved infrared spectroscopy