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MO: Fachverband Molekülphysik
MO 8: Poster 1
MO 8.20: Poster
Dienstag, 15. März 2022, 16:30–18:30, P
Ligand release from a molybdenum carbonyl complex via an organic photosensitizer — •Marcel Fischer, Kevin Artmann, Roger Jan Kutta, and Patrick Nuernberger — Institute of Physical and Theoretical Chemistry, Universität Regensburg, 93040 Regensburg
Carbon monoxide (CO) can be released from metal carbonyl complexes upon excitation by light. To circumvent the population of excited singlet states, also triplet-triplet energy transfer can be employed [1,2]. We investigate the influence of the triplet photosensitizer benzophenone (BP) on the photochemical behavior of molybdenum hexacarbonyl Mo(CO)6. By transient absorption spectroscopy, we observed energy transfer from BP to the complex resulting in the formation of the dissociation products Mo(CO)5 and Mo(CO)4. An intermediate with a lifetime larger than a millisecond is also observed, putatively related to the interaction of two product molecules in solution.
The approach may prove beneficial for mixed carbonyl-nitrosyl complexes, in which the photorelease of a ligand may proceed differently in excited singlet and triplet states, respectively, as implied by calculations and ongoing experiments [3].
[1] A Vogler, Z. Naturforsch. B 25, 1069 (1970).
[2] S. H. C. Askes et al., J.Am.Chem.Soc. 139, 15292 (2017).
[3] N. Gessner et al., Phys. Chem. Chem. Phys. 23, 24187 (2021).