Synthesis, crystal and molecular structures of the octanuclear cationic mixed-valence cobalt acetate complex

A new octanuclear mixed-valence cobalt acetate complex of the cationic type [Co4IICo4III(μ4-O)4(μ3-OMe)4(μ-OAc)6(H2O)8]F2 · 10H2O ([I]F2 · 10H2O) was prepared by crystallization from a solution of ‘cobalt(III) acetate’ in a Me2CO-MeOH-H2O-HF mixture and studied by X-ray diffraction. The crystals are monoclinic: space group C2/c, a = 17.222 A, b = 16.836 A, c = 16.586 A, β = 94.902°, Z = 4, R = 4.37% (I > 2σ(I)). In the crystal, the I2+ complex cations, fluoride anions, and solvate water molecules form a three-dimensional (3D) coordination supermolecular system.