Structure and magnetism of mono-, di-, and trinuclear benzoato cobalt(II) complexes
作者:J. Hudák、R. Boča、Ľ. Dlháň、J. Kožíšek、J. Moncoľ
DOI:10.1016/j.poly.2011.02.047
日期:2011.4
Three cobalt(II) - benzoato (bz) complexes have been prepared and structurally characterized. In the mononuclear complex trans-[Co(bz)(2)(H2O)(2)(nca)(2)] the benzoato ligand is unidentate (nca = nicotinamide). The dinuclear complex [(mu(2)-bz)(4)Co(qu)}(2)] is a structural analog of the copper acetate (qu = quinoline) where four bidentate benzoato ligands link two cobalt(II) pentacoordinate centers. The trinuclear complex of the composition [Co-3(bz)(6)(inca)(6)] contains a central hexacoordinate (bz)(2)Co(inca)(2)(bz)(2)} unit in which the bidentate benzoato ligands held the central and peripheral cobalt(II) centers (inca = iso-nicotinamide); the peripheral hexacoordinate (bz)Co(inca)(2)<} units contain the terminal benzoato ligand in its bidentate function. The magnetic susceptibility data down to T = 2 K and the magnetization data up to B = 7 T reveal a considerable magnetic anisotropy due to the single-ion zero-field splitting. (C) 2011 Elsevier Ltd. All rights reserved.