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[Ni 2 (H 2 O) 4 (Htrz) 3 ] 2 (KS 5 W 30 O 110 )}∙18H 2 O (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 {S 5 W 30 O 110 } captures a K + ion resulting in the anion {KS 5 W 30 O 110 } 9− , which was further connected by dimeric [Ni 2 (H 2 O) 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 H 2 O 2 and NO 2 − .