Issue 40, 2015

Enhanced photocatalytic hydrogen production by introducing the carboxylic acid group into cobaloxime catalysts

Abstract

A series of cobaloxime complexes, [Co(III)(dmgH)2(py-m-X)Cl] (dmgH = dimethylglyoxime, py-m-X = meta-substituted pyridine, X = COOH (2), COOCH3 (3), CH2CH2COOH (6), and CH2CH2COOCH3 (7)), and [Co(III)(dmgH)2(py-p-X)Cl], (py-p-X = para-substituted pyridine, X = COOH (4) and COOCH3 (5)), were synthesized and their photocatalytic H2 production activities were compared in an artificial photosynthesis system containing a xanthene dye Eosin Y as the photosensitizer (PS) and triethanolamine (TEOA) as the sacrificial reductant (SR) in CH3CN/H2O (1 : 1, pH = 7.5). Irrespective of substitution by an electron-donating or electron withdrawing group, the photocatalytic H2 production activities of 2–7 are all higher than that of [Co(III)(dmgH)2(py)Cl] (1). Importantly, meta-substitution is more efficient than para-substitution, and COOH is more efficient than COOCH3, in enhancing the photocatalytic activities. 6 showed the highest activity among the examined complexes. The –CH2CH2– chain linking COOH and pyridine might play a role in the promising performance of 6, which makes the proton relay via interaction between COOH and dmgH possible. This work may open new avenues for developing more efficient cobaloxime-based H2 evolution catalysts (HERs).

Graphical abstract: Enhanced photocatalytic hydrogen production by introducing the carboxylic acid group into cobaloxime catalysts

Supplementary files

Article information

Article type
Paper
Submitted
13 Jul 2015
Accepted
02 Sep 2015
First published
04 Sep 2015

Dalton Trans., 2015,44, 17704-17711

Enhanced photocatalytic hydrogen production by introducing the carboxylic acid group into cobaloxime catalysts

J. Wang, C. Li, Q. Zhou, W. Wang, Y. Hou, B. Zhang and X. Wang, Dalton Trans., 2015, 44, 17704 DOI: 10.1039/C5DT02645H

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