Polyoxometalate-based supramolecular architecture constructed from a purely inorganic 1D chain and a metal–organic layer with efficient catalytic activity

A new polyrotaxane structure, {Ag8O(Htrz)4(4,4′-bpy)2}{AgPMo12O40} (Htrz = 1,2,4-triazole, 4,4′-bpy = 4,4′-bipyridine) (1), was obtained by the reaction of Ag+, H5PMo10V2O40 and mixed organic linking ligands under hydrothermal conditions. The structure has been characterized by IR, TG analysis, elemental analysis, X-ray powder diffraction and single-crystal X-ray diffraction. In 1, a purely inorganic 1D chain composed of Keggin-type polyoxoanions and Ag+ linkers, interluded into the 2D Ag–organic layers, resulting in the polyrotaxane structure. This is the first polyrotaxane compound constructed from a POM-based purely inorganic 1D chain and Ag-Htrz-4,4′-bpy 2D networks. The ratio of the mixed ligands played a crucial role in the synthesis of the title compound. Moreover, compound 1 exhibited efficient catalytic activity for the oxidation of desulfurization, and possessed electrocatalytic activity for the reduction of H2O2 and BrO3−.