Erlangen 2022 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 15: Poster 2
MO 15.5: Poster
Mittwoch, 16. März 2022, 16:30–18:30, P
Studies on the Photocleavage Mechanism of the Manganese Complex MnBr(CO)3(pytz-CH2C6H5) — •Niklas Gessner1, Ulrich Schatzschneider2, and Patrick Nuernberger1 — 1Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93040 Regensburg — 2Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg
Photoactivatable carbon monoxide (CO) releasing molecules (PhotoCORMs) have promising applications in medicine and biology, e.g. as cancer treatment agents [1]. In a common approach, one or more CO molecules are bound to an inert transition metal complex that comprises a multidentate organic ligand to control its physical and (bio-)chemical properties [2] like photoexcitation energies or the enrichment efficiency in cancerous tissue.
By using UV pump/mid-IR probe ultrafast transient absorption spectroscopy, the PhotoCORM [MnBr(CO)3(pytz-CH2C6H5)], pytz being 2-(1,2,3-triazol-4-yl)pyridine, has been investigated in order to identify the ligand that is cleaved off and to elucidate the reaction mechanism and the dynamics after photoexcitation. Results are compared to density functional theory calculations of possible transient intermediates and products, as well as to steady-state absorption measurements. It is found that a ligand is cleaved off after photoexcitation and that the dynamics are finished within 100 ps, so that either the reactant complex is retrieved or a persistent photoproduct is formed.
[1] J. Niesel et al., Chem. Commun. 15, 1798–1800 (2008).
[2] M. A. Gonzalez et al., Inorg. Chem. 21, 11930–11940 (2012).