The formation of monomethyl carbonate-bridged dinuclear nickel(II) complexes by an efficient CO2 uptake in methanol containing urea derivatives

Monomethyl carbonate-bridged dinuclear nickel(II) complexes [Ni-2(L)(OOC-O-CH3)(CH3OH)(2)](ClO4)(2) . H2O . CH3OH, 1 and [Ni-2(L)(OOC-O-CH3)(H2O)(2)](ClO4)(2) . H2O, 2 were obtained in the presence of [Ni-2(L)(OH)(H2O)(2)](ClO4)(2) and N-methylurea at room temperature in air, where HL is N,N,N',N'-tetrakis[(1-ethyl-2-benzimidazolyl)methyl]- 2-hydroxy-1,3-diaminopropane. The crystal structure of 1 was determined by X-ray crystallography and 2 was characterized by the magnetic susceptibility and visible absorption spectrum.