Hydrothermal Syntheses and Crystal Structures of Complex-Linked Three-Dimensional Coordination Vanadium Selenites: M(4,4‘-bipy)(H₂O)V₂Se₂O₁₀ (M = Co, Ni)

Two inorganic−organic hybrid compounds with the formula M(4,4‘-bipy)(H2O)V2Se2O10 (M = Co, Ni) were hydrothermally synthesized and characterized by single-crystal X-ray diffraction. Compounds Co(4,4‘-bipy)(H2O)V2Se2O10 (1) and Ni(4,4‘-bipy)(H2O)V2Se2O10 (2), which are structural analogues, crystallize in the triclinic space group P1̄ with crystal data a = 7.9665(3) Å, b = 8.1974(3) Å, c = 13.8096(4) Å, α = 85.704(2)°, β = 73.5180(10)°, γ = 75.645(2)°, V = 837.76(5) Å3, and Z = 2 and a = 7.9489(19) Å, b = 8.128(2) Å, c = 13.709 Å, α = 85.838(6)°, β = 73.736(8)°, γ = 75.594(9)°, V = 823.5(4) Å3, and Z = 2, respectively. [M(4,4‘-bipy)(H2O)V2Se2O10] (M = Co, Ni) have a three-dimensional structure and consist of two subunits, [(VO2)(SeO3)]- infinite chains and [M(4,4‘-bipy)(H2O)]2+ fragments. The [(VO2)(SeO3)]- chains are composed of [V2Se4O14]4- clusters linked by VO4N triangular bipyramids. The 4,4‘-bipy molecule as a bifunctional organic ligand is directly linked to Co or Ni and V atoms, affording the three-dimensionality. The compounds were characterized by infrared spectroscopy and differential thermal and thermogravimetric analyses.