Structural transformation from Waugh-type to Keggin-type polyoxomolybdate-based crystalline material for photo/electrocatalysis
摘要
An inorganic–organic hybrid crystalline material (SiMo12O40)[Cu(2,2′-bipy)2]2·2H2O (Complex 1, 2,2′-bipy = 2,2′-bipyridine) was synthesized for the first time by using 2,2′-bipy and transition metal copper to convert Waugh-type polyoxometalate [MnMo9O32]6− into a Keggin polyoxometalate structure [SiMo12O40]4− under hydrothermal conditions in glass vials. Single crystal tests and a series of characterizations were carried out on Complex 1. The structure of Complex 1 is composed of [SiMo12O40]4− and [CuII(2,2′-bipy)2]2+. The five-coordinated Cu is connected to two 2,2′-bipy through Cu–N bonds, forming an approximately square structure. Astonishingly, Complex 1 exhibited good photocatalytic performance for methylene blue degradation and electrocatalytic nitrite reduction properties simultaneously.
Graphical abstract