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

Abstract

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⁻.