Extended structural materials constructed from sulfate-centered Preyssler-type polyoxometalate with excellent electrocatalytic property

Abstract

Sulfate-centered Preyssler-type polyoxometalate was used as the precursor to react with transition metal cations and organic ligand for constructing inorganic-organic hybrid materials {H[Ni2(H2O)4(Htrz)3]2(KS5W30O110)}∙18H2O (trz=1,2,4-triazole) (1), which was characterized by single crystal X-ray diffraction analysis, energy-dispersive X-ray (EDX), power X-ray diffraction (PXRD), IR spectra and thermogravimetric (TG) analyses. In 1, the cylindrical vacancy of the inorganic crown-type anion {S5W30O110} captures a K+ ion resulting in the anion {KS5W30O110}9−, which was further connected by dimeric [Ni2(H2O)4(Htrz)3]2 metal-organic units into an one-dimensional (1D) chain-like structure. These 1D chains are further packed to form a three-dimensional (3D) supramolecular structure via H-bonding interactions. Here, the sulfate-centered Preyssler-typepolyoxometalate was firstly used to coordinate with transition metal cations and introduced into the inorganic-organic hybrid materials. Electrocatalytic study indicates that compound 1 exhibits good electrocatalytic activity toward reduction of H2O2 and NO2−.