Hydrothermal Synthesis, Crystal Structure and Thermal Analysis of a Dinuclear Complex Cd2（3,5-Dinitrobenzoate）4（pyridine）4

Hydrothermal Synthesis, Crystal Structure and Thermal Analysis of a Dinuclear Complex Cd2(3,5-Dinitrobenzoate)4(pyridine)4

A dinuclear complex Cd2(dnba)4(pyridine)4 (dnba = 3,5-dinitrobenzoate) has been synthesized by hydrothermal method and characterized by X-ray single-crystal diffraction, elemen- tal analysis, FT-IR spectroscopy, DSC and TG-DTG techniques. The complex with empirical formula C48H32Cd2N12O24 (Mr = 692.83) crystallizes in monoclinic, space group P21/n with a = 12.0344(14), b = 10.5752(13), c = 21.578(3) (A), β = 104.150(2)o, V = 2662.8(6) (A)3, Z = 2, Dc = 1.728 g/cm3, μ(MoKα) = 0.897 mm-1, F(000) = 1384, S = 1.016 and (Δ/σ)max = 0.001. R = 0.0638 and wR = 0.0737 for all data; the final R = 0.0337 and wR = 0.0644. In this complex, four carboxylates are bidentate- or chelate-coordinated with the Cd(Ⅱ) centers to give the dinuclear structure. The other coordination positions of Cd(Ⅱ) are occupied by the lone pair electrons from N of four pyridines. Thermal analyses DSC and TG-DTG have been used to determine the thermal decomposition mechanism of the title complex.