Issue 2, 2017

Chemical and photochemical water oxidation catalyzed by novel ruthenium complexes comprising a negatively charged NCNHCO ligand

Abstract

Incorporation of negatively charged moieties into complexes is a promising strategy to develop water oxidation catalysts with high stability and low over-potentials. We reported here the synthesis of a novel pincer-type ligand precursor, 1-(pyridin-2-ylmethyl)-3-methylcarboxylate-imidazolium (1). Deprotonation of C2-H of 1 resulted in formation of NCNHCO, a negatively charged asymmetric N-heterocyclic carbene (NHC). Complexes [Ru(NCNHCO)(terpy)]+ (2) and RuCl(NCNHCO)(DMSO)(pic) (3) were prepared and capable of decomposing water chemically and photo-chemically. Under acidic conditions, 4-picoline/H2O exchange in 3 was detected by UV-vis and 1H NMR, forming the corresponding Ru–aqua complex. In a typical three-component light-induced water oxidation, a turnover number of 273 was attained employing 3, which demonstrated catalytic ability comparable to those state-of-the-art catalysts.

Graphical abstract: Chemical and photochemical water oxidation catalyzed by novel ruthenium complexes comprising a negatively charged NCNHCO ligand

Supplementary files

Article information

Article type
Paper
Submitted
06 Nov 2016
Accepted
12 Dec 2016
First published
12 Dec 2016

Catal. Sci. Technol., 2017,7, 387-395

Chemical and photochemical water oxidation catalyzed by novel ruthenium complexes comprising a negatively charged NCNHCO ligand

W. Su, H. A. Younus, K. Zhou, Z. A. K. Khattak, S. Chaemcheun, C. Chen and F. Verpoort, Catal. Sci. Technol., 2017, 7, 387 DOI: 10.1039/C6CY02333A

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