Synthesis, Crystal Structure and Spectrothermal Analysis of mer-Triaquanicotinamide Cobalt(II) Trihydrate

Abstract

The mixed-ligand orotato (HOr)2- complex of cobalt(II) with nicotinamide (NA) [Co(HOr)(H<inf>2</inf>O)<inf>3</inf>(NA)]·3H <inf>2</inf>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) Å, α = 77.003(5), β = 78.852(5), γ = 80.987(5)° 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. © 2005 Wiley-VCH Verlag GmbH & Co. KGaA.