Hydrothermal synthesis and structure of a new three-dimensional inorganic-organic hybrid polyoxomolybdate based on keggin cluster units

A new 3-D inorganic-organic hybrid compound {[Cu(4,4′-bipy)] ₃(4,4′-bipy)}[PMo₁₂O₄₀]·2H ₂O (1) was hydrothermally synthesized and characterized by IR, TG and X-ray diffraction analysis. Single crystal X-ray diffraction confirms that this compound crystallizes in the triclinic crystal system, space group P-1 with a = 10.9180(11), b = 12.3759(13), c = 13.0264(13) Å, α = 113.3560(10)°, β = 93.8730(10)°, γ = 99.0300(10)°. V = 1579.4(3) A°³, Z = 1. Structural analysis indicates that compound 1 exhibits a three-dimensional structure, in which Keggin anions [PMo ₁₂O₄₀]^3- are linked by infinite [Cu(4,4′-bipy)]⁺_n chains through Cu-O, and come into being a 3-D inorganic-organic hybrid open framework. The guest 4,4′-bipy molecules and water molecules are filled in the channel formed by Keggin anions [PMo₁₂O₄₀]^3- and [Cu(4,4′-bipy)] ⁺_n chains.