Jump to main content
Jump to site search

Issue 31, 2016
Previous Article Next Article

Osmium(II) complexes for light-driven aerobic oxidation of amines to imines

Author affiliations

Abstract

Herein, we describe the synthesis and characterization of three Os(II) complexes (i.e., [Os(fptz)2(PPhMe2)2] (1, fptzH = 3-trifluoromethyl-5-pyridyl-1,2,4-triazole), [Os(fptz)2(CO)(L1)] (2, L1 = PPh3; 3, L1 = pyridine)) that have been successfully utilized as good photocatalysts to promote aerobic oxidative coupling of amines to imines with molecular oxygen in air as a green oxidant. Complex 1 is the most effective catalyst for the oxidative coupling of benzylamine with molecular O2 (air) as the oxidant because of the complex's strong absorption of visible light and long-lived triplet state. The application of a low catalyst loading (0.06 mol%) of complex 1 to the oxidative coupling of a wide range of amines affords the corresponding imines efficiently and selectively in most cases. The reaction mechanism was investigated via relevant control and quenching experiments. The results indicated that the reaction occurs via an active 1O2-involved pathway. The 1O2-generating ability of complex 1 as a photosensitizer was evaluated using 9,10-dimethylanthracene (DMA) as a chemical trap for 1O2.

Graphical abstract: Osmium(ii) complexes for light-driven aerobic oxidation of amines to imines

Back to tab navigation

Supplementary files

Publication details

The article was received on 12 Jun 2016, accepted on 02 Jul 2016 and first published on 05 Jul 2016


Article type: Paper
DOI: 10.1039/C6DT02331B
Citation: Dalton Trans., 2016,45, 12400-12408

  •   Request permissions

    Osmium(II) complexes for light-driven aerobic oxidation of amines to imines

    Y. Li, X. Liu, Z. Yu, Z. Li, S. Yan, G. Chen and Z. Zou, Dalton Trans., 2016, 45, 12400
    DOI: 10.1039/C6DT02331B

Search articles by author

Spotlight

Advertisements