SYNTHESIS, CRYSTAL-STRUCTURE AND SPECTRAL STUDIES OF THE COMPLEX [NI(C3H4N2)4(H2O)2].(C6H4COSO2N)2

The title compound has been synthesized and its crystal structure determined at room temperature. M(r) = 731.39, triclinic, space group P1BAR, a = 9.020(3), b = 11.280(7), c = 7.784(2) angstrom, alpha = 97.05(4), beta = 97.08(2), gamma = 105.32(4)-degrees, U = 748(1) angstrom3, Z = 1, D(calc) = 1.624 g/cm3. The final R is 0.030 for 3095 independent observed reflections with I greater-than-or-equal-to 3sigma(I). The crystal structure consists of repeated [Ni(im)4(H2O)2]2+ cations and noncoordinated saccharin anions. In the complex cation [Ni(im)4(H2O)2]2+, Ni2+ is bonded to four N atoms from four imidazole molecules and two 0 atoms from two water molecules forming an approximately square octahedral stereochemistry. The d-d transition spectrum of the title compound is also reported and is explained perfectly with the scaling radial theory which was proposed by us.