Gessner, Niklas and Baeck, Anna K. and Knorr, Johannes and Nagel, Christoph and Marquetand, Philipp and Schatzschneider, Ulrich and Gonzalez, Leticia and Nuernberger, Patrick (2021) Ultrafast photochemistry of a molybdenum carbonyl-nitrosyl complex with a triazacyclononane coligand. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 23 (42). pp. 24187-24199. ISSN 1463-9076, 1463-9084
Full text not available from this repository. (Request a copy)Abstract
Transition metal complexes capable of releasing small molecules such as carbon monoxide and nitric oxide upon photoactivation are versatile tools in various fields of chemistry and biology. In this work, we report on the ultrafast photochemistry of [Mo(CO)(2)(NO)(iPr(3)tacn)]PF6 (iPr(3)tacn = 1,4,7-triisopropyl-1,4,7-triazacyclononane), which was characterized under continuous illumination and with femtosecond UV-pump/UV-probe and UV-pump/MIR-probe spectroscopy, as well as with stationary calculations. The experimental and theoretical results demonstrate that while the photodissociation of one of the two CO ligands upon UV excitation can be inferred both on an ultrafast timescale as well as under exposure times of several minutes, no evidence of NO release is observed under the same conditions. The binding mode of the diatomic ligands is impacted by the electronic excitation, and transient intermediates are observed on a timescale of tens of picoseconds before CO is released from the coordination sphere. Furthermore, based on calculated potential energy scans, we suggest that photolysis of NO could be possible after a subsequent excitation of an electronically excited state with a second laser pulse, or by accessing low-lying excited states that otherwise cannot be directly excited by light.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PULSE UP-CONVERSION; CRYSTAL-STRUCTURE; ULTRAVIOLET PHOTODISSOCIATION; COORDINATION CHEMISTRY; MOLECULAR-STRUCTURE; METAL-CARBONYL; CO RELEASE; X-RAY; DYNAMICS; NO |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Physical Chemistry I > Prof. Dr. Patrick Nürnberger |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 05 Jul 2022 06:07 |
| Last Modified: | 05 Jul 2022 06:07 |
| URI: | https://pred.uni-regensburg.de/id/eprint/46864 |
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