Structure and characterization of hexakis(imidazole) cobalt(II) complexes:[Co(Im)(6)(OBz)(2)] and [Co(Im)(6)(mB)(2)] (Im = imidazole, OBz = benzoate, mB = p-methoxybenzoate)

The crystal and molecular structures of the complexes of [Co(Im)(6)(OBz)(2) ] and [Co(Im)(6)(mB)(2)] (Im = imidazole, OBz = benzoate, mB = p-methoxyben zoate) have been determined by X-ray crystallography. The crystal structure s are very similar and consist of discrete molecules of [Co(Im)(6)(OBz)(2)] and [Co(Im)(6)(mB)(2)], respectively. They both crystallize in the triclin ic system, space group P (1) over bar the former with lattice parameters a = 7.6934(3), b = 10.4518(5), c = 11.6088(5) Angstrom, alpha = 73.920(1), be ta = 79.023(1), gamma = 73.681(1)degrees, and Z = 1; the latter with a = 9. 8336(3), b = 10.5509(2), c = 10.8889(3) Angstrom, alpha = 61.450(1), beta = 76.832(1), gamma = 71.157(1)degrees, and Z = 1. The cobalt(II) ions have o ctahedral geometry with a CoN6 chromophore. In the solid state, the complex es all form a three-dimensional network through N-H...O hydrogen bonds. The electronic spectra and IR spectra data are in agreement: with the structur al data.