Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2012-02-20

Journal: INORGANIC CHEMISTRY

Included Journals: Scopus、SCIE、PubMed

Volume: 51

Issue: 4

Page Number: 2115-2120

ISSN: 0020-1669

Abstract: The combination of cobalt diimine-dioxime complexes with a cyclometalated iridium photosensitizer gives efficient systems for hydrogen generation under visible-light irradiation using triethylamine as a sacrificial electron donor. Interestingly, the addition of triphenylphosphine (PPh3) to the medium results in a significant improvement of the stability of the system, with up to similar to 700 turnovers achieved within 10 h. UV-visible spectroscopic monitoring of the reaction allows identification of a PPh3-coordinated Co-I intermediate as the active species. Mechanistic issues regarding (i) the photogeneration of the Co-I species, (ii) the nature of the active species, and (iii) the influence of PPh3 on the H-2-evolution mechanism are discussed.