Acta Cryst. (2004). E60, m1900-m1902  [ doi:10.1107/S1600536804029605 ]

A linear trinuclear Co^II-Co^II-Co^II complex with -acetate bridges: di--acetato-bis[-N,N'-bis(salicylidene)-1,4-butanediaminato]tricobalt(II)

Z.-L. You, H.-L. Zhu and W.-S. Liu

Abstract: The title linear trinuclear complex, di--acetato-1:2²O,O';2:3²O,O'-bis{2,2'-[1,4-butanediylbis(nitrilomethylidyne)]diphenolato}-1:2⁶O,N,N,O':O,O';2,3⁶O,O':O,N,N,O'-tricobalt(II), [Co₃(C₁₈H₁₈N₂O₂)₂(C₂H₃O₂)₂], was prepared by the reaction of the tetradentate Schiff base ligand bis(salicylidene)-1,4-diaminobutane and Co(CH₃COO)₂·2H₂O in a methanol solution. The central Co^II ion, which is located on an inversion center, has a distorted octahedral coordination involving four bridging O atoms from two Schiff base ligands in the equatorial plane and one O atom from each bridging acetate group in the axial positions. The coordination around the terminal Co^II ion is irregular square pyramidal, with two O and two N atoms of the ligand in the basal plane and one O atom from an acetate group in the apical position. The acetate bridges linking the central and terminal Co^II ions are mutually trans. The closest CoCo separation is 3.125 (4) Å.

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