A novel two-dimensional mixed molybdenum–vanadium polyoxometalate: Synthesis, magnetic property and characterization of [PMo8VIMo4VO40(VIVO)2{Co(phen)2}2](H3O)2[PMo4VIMo8VO40(VIVO)2{Co(phen)2(H2O)}2]

A new compound [PMo8VIMo4VO40(VIVO)2{Co(phen)2}2](H3O)2[PMo4VIMo8VO40(VIVO)2{Co(phen)2(H2O)}2]1 (phen = phenanthroline) has been synthesized under hydrothermal conditions and characterized by IR, TG analysis and single-crystal X-ray diffraction. The study of the magnetic property of compound 1 exhibits the presence of antiferromagnetic interactions. Compound 1 crystallizes in the monoclinic system, space group P21/c, a = 21.843(4) Å, b = 16.566(3) Å, c = 21.025(4) Å, α = 90°, β = 100.26(3)°, γ = 90°, V = 7486(3) Å3, Z = 2. The basic building unit in compound 1 is the [PMo12V2O42] cluster. The most remarkable structural feature of 1 is that there exist two distinct [PMo12V2O42] clusters. One is covalently linked by [Co(phen)2] complexes to form 2D covalent layer, the other supports two [Co(phen)2(H2O)] complexes forming a 2D supramolecular network. Such two different kinds of layers are further stacked to form a novel 3D supramolecular framework.