ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE, vol.631, no.12, pp.2497-2500, 2005 (SCI-Expanded)
The mixed-ligarld orotato (HOr)(2-) complex of cobalt(II) with nicotinamide (NA) [Co(HOr)(H2O)(3)(NA)]center dot 3H(2)O was synthesized and characterized by elemental analysis, magnetic susceptibility, conductivity, spectral methods (UV-Vis and FT-IR), simultaneous TG, DTG, DTA techniques and X-ray diffraction. The complex crystallizes in the triclinic space group P-1 with unit cell parameters a = 9.320(5), b = 9.493(5), c = 10.381(5) angstrom, alpha = 77.003(5), beta = 78.852(5), gamma = 80.987(5)degrees and Z = 2. The crystal structure has indicated that the complex has been slightly distorted octahedral geometry and is chelated by the deprotonated N(3) pyrimidine ring and by the carboxylate oxygen atom of the orotate ligand. One nicotinamide molecule is also coordinated to the metal ion by the N atom of the pyridine ring. The crystal structure consists of discrete monomeric units of the complex, which are bridged via hydrogen bonding.