Hydrothermal synthesis and crystal structure of [Ni(2,2′-bpy)₃]MoO₄·7.5H₂O

The title compound [Ni(2,2′-bpy)₃]MoO₄·7.5H₂O was hydrothermally synthesized and its structure was determined by single-crystal X-ray analysis. This compound crystallizes in monoclinic crystal system, space group C2/c with a = 23.019(5), b = 13.967(3), c = 23.510(5) Å, β = 107.28(3)°, T = 293(2) K, V = 7217(3) ų, Z = 8, D_c = 1.514 g/cm³, F(000) = 3384, M_r = 822.32, μ(MoKα) = 0.934mm^-1, R = 0.0357, wR = 0.0794 (w = 1/[σ²(F_o²) + (0.0407P)²] where P = (F_o² + 2F_c²)/3), S = 0.910, (Δ/σ)_max = 0.002, (Δρ)_max = 0.321 and (Δρ)_min = -0.625 e/ų. The structure constructs from MoO₄^2- anions, Ni(2,2-bpy)₃²⁺ cations and crystallographic water molecules. There exists electrostatic interaction between the anions and cations. In addition, the anions interact with the crystallographic water molecules via hydrogen bonds and further form inorganic layer.