Structural transformation from Waugh-type to Keggin-type polyoxomolybdate-based crystalline material for photo/electrocatalysis

An inorganic-organic hybrid crystalline material (SiMo12O40)[Cu(2,2 '-bipy)2]2 center dot 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. ?2,2'-ͭƿWaugh [MnMo9O32]6-Keggin[SiMo12O40]4-?-(SiMo12O40)[Cu(2,2'-bipy)2]2 center dot 2H2O(1, 2,2'-bipy = 2,2'-?.1 ?1[SiMo12O40]4-offspring [CuII(2,2'-bipy)2]2+?CuCu-N2,2'-bipy?.?1 ߼.