A novel trinuclear cobalt(II) complex derived from an asymmetric Salamo-type N_2O_3 bisoxime chelate ligand: Synthesis, structure and optical properties

摘要

A novel trinuclear Co(II) complex, {[CoL(PrOH)]_2Co(H_2O)}?PrOH, has been synthesized with 6-ethoxy-6'-hydroxy-2,2'-[ethylenedioxybis(nitrilomethylidyne)]diphenol (H_3L), and characterized by elemental analyses, FT-IR, UV-Vis, molar conductance and X-ray crystallographic analysis. Two n-propanol molecules and one water molecule coordinate to three Co(II) ions and four l-phenoxo oxygen atoms from two [CoL(CH_3CH_2CH_2OH)] units also coordinating to Co(II) ion. All the penta-coordinated Co(II) ions of the Co(II) complex have a slightly distorted trigonal bipyramidal coordinated polyhedron. Meanwhile, the l-phenoxo bridges play important roles in assembling Co(II) ions and L~(3-) units, which is different from the normal trinuclear Co(II) complexes with the Salamo-type ligands reported early.