Synthesis and Crystal Structure of Five-Coordinated Cobalt(II) Dimer with Asymmetrical N2O2 Coordination Sphere

A novel Co(II) dimer, [Co(HL)](2), has been synthesized by the reaction of H3L and Co(CH3COO)(2)center dot 4H(2)O in acetonitrile/methanol solution. X-Ray crystallographic analysis reveals that the Co(II) complex crystallizes in the triclinic system, space group P-1. The Co(II) atom is five-coordinated by four donor atoms of N2O2 coordination sphere and one O atom from other [Co(HL)] unit. Both of Co(II) atoms followed trigonal bipyramidal geometry. The complex molecule links with four other molecules into an infinite 2D-layer supramolecular structure on the bc crystallographic plane via intermolecular O-H-O, C-H-Br and C-H-O hydrogen-bonding interactions.