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A Polyoxometalate-Based Complex With Visible-Light Photochromism as the Electrocatalyst for Generating Hydrogen From Water

A Polyoxometalate-Based Complex With Visible-Light Photochromism as the Electrocatalyst for Generating Hydrogen From Water

Yun Gong, Yong Xi Yang, Miao Miao Zhang, Xiao Lin Gao, Jun Li Yin, Jian Hua Lin

Dalton Trans. 2014 Nov 28;43(44):16928-36.

PMID: 25300197

Abstract:

Two polyoxometalate (POM)-based complexes formulated as (HL1)2(Mo8O26)·2HL1·11H2O (L1 = 3-(5-(1H-pyrazol-4-yl)-1H-1,2,4-triazol-3-yl)pyridine) (1) and Co2(L2)4[P2Mo(VI)5O23Mo(II)(H2O)2]·3H2O (L2 = 4-(5-(2H-1,2,4-triazol-3-yl)-2H-1,2,4-triazol-3-yl)pyridine) (2) have been synthesized and structurally characterized by single-crystal X-ray diffraction. Complex 1 shows a bi-capped POM with the two Mo centers from the [Mo8O26](4-) moiety coordinated by two HL1 ligands via two Mo-N bonds. Complex 2 consists of a mononuclear unsaturated coordinated Co(ii) unit and a [P2Mo(VI)5O23Mo(II)(H2O)2](4-) moiety, in which [P2Mo(VI)5O23Mo(II)(H2O)2](4-) shows a chain-like structure constructed from edge-sharing or vertex-sharing {MoO6} and {PO4} polyhedra. The two complexes are both soluble in neutral aqueous solution and they can electrocatalyze the H2 evolution reaction (HER) from water with lowered overpotentials and enhanced currents, and complex 1 shows better electrocatalytic activity for the HER than complex 2. Complex 1 shows visible-light photochromism. In the presence of complex 1, the HER current is enhanced with visible-light irradiation in comparison with the current without light irradiation.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP23195622	2-(1H-1,2,4-Triazol-3-yl)pyridine		23195-62-2	Price

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