Synthesis and characterization of a pure inorganic 3D network based on the [Sr2P9HMo12O71]20–cluster and strontium(II) linkers

Abstract

Novel supramolecular networks based on an anionic polymolybdophosphate cluster Sr₁₀(H₂O)₁₂[Sr₂P₉HMo₁₂O₇₁] is hydrothermally synthesized and structurally characterized by single crystal X-ray diffraction, thermogravimetric analysis, infrared, ultraviolet spectroscopy, and cyclic voltammetry in an aqueous solution. It crystallizes in the orthorhombic space group Pnmm (No. 59) with a = 12.699(1) Å, b = 14.914(1) Å, c = 23.851(2) Å and Z = 2. The compound is made up of unusual shaped-cage [Sr₂P₉HMo₁₂O₇₁]²⁰⁻. The strontium cations are divided in two kinds. The first occupy vacant sites in the [P₉Mo1_2O68]^n– polyoxoanions unit and the second [Sr(H₂O)₆]²⁺, [Sr(H₂O)₄]²⁺, and [Sr(H₂O)₂]²⁺ serve to bridge together the adjacent polymolybdophosphate clusters to yield unprecedented three-dimensional pure inorganic assemblies of the shaped-cage polymolybdophosphate clusters.