Development of a panchromatic photosensitizer and its application to photocatalytic CO 2 reduction.

Autor: Irikura M; Department of Chemistry, School of Science, Tokyo Institute of Technology O-okayama 2-12-1-NE-1, Meguro-ku Tokyo 152-8550 Japan tamaki@chem.titech.ac.jp ishitani@chem.titech.ac.jp., Tamaki Y; Department of Chemistry, School of Science, Tokyo Institute of Technology O-okayama 2-12-1-NE-1, Meguro-ku Tokyo 152-8550 Japan tamaki@chem.titech.ac.jp ishitani@chem.titech.ac.jp., Ishitani O; Department of Chemistry, School of Science, Tokyo Institute of Technology O-okayama 2-12-1-NE-1, Meguro-ku Tokyo 152-8550 Japan tamaki@chem.titech.ac.jp ishitani@chem.titech.ac.jp.
Jazyk: angličtina
Zdroj: Chemical science [Chem Sci] 2021 Sep 28; Vol. 12 (41), pp. 13888-13896. Date of Electronic Publication: 2021 Sep 28 (Print Publication: 2021).
DOI: 10.1039/d1sc04045f
Abstrakt: We designed and synthesized a heteroleptic osmium(ii) complex with two different tridentate ligands, Os . Os can absorb the full wavelength range of visible light owing to S-T transitions, and this was supported by TD-DFT calculations. Excitation of Os using visible light of any wavelength generates the same lowest triplet metal-to-ligand charge-transfer excited state, the lifetime of which is relatively long ( τ em = 40 ns). Since excited Os could be reductively quenched by 1,3-dimethyl-2-( o -hydroxyphenyl)-2,3-dihydro-1 H -benzo[ d ]imidazole, Os displays high potential as a panchromatic photosensitizer. Using a combination of Os and a ruthenium(ii) catalyst, CO 2 was photocatalytically reduced to HCOOH via irradiation with 725 nm light, and the turnover number reached 81; irradiation with light at λ ex > 770 nm also photocatalytically induced HCOOH formation. These results clearly indicate that Os can function as a panchromatic redox photosensitizer.
Competing Interests: There are no conflicts to declare.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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