Crystal structure and magnetic properties of a binuclear copper(II) complex bridged by an alkoxo-oxygen atom and an acetate ion

[Cu-4(L)(2)(O2CMe)(2)].H2O (L = 1,3-bis(5-bromo-2-hydroxybenzylidene)propan -2-ol) was synthesized and its crystal structure determined. (C38H34N4O10Br 4Cu4).H2O, monoclinic, space group P2(1)/c, a = 21.072(5), b = 9.673(2), c = 21.934(4) Angstrom, beta = 109.73(2)degrees, V = 4208(2) Angstrom (3), Z = 4. The crystal structure consists of two independent binuclear copper(II) complexes and the non-coordinating water molecule in the asymetric unit. T he Cu(II) ions are in a square-planar geometry and coordinated by donor ato ms of the ligand (NO3). The average Cu Cu distance and average Cu-O-Cu angle are 3.491(2) Angstrom and 132.0(1)degrees, respectively. Temperature-dependent magnetic susceptib ility measurements of the complex show an intramolecular antiferromagnetic coupling in the dimeric Cu(II) core. The fitting parameters are -2J = 174.4 cm(-1), g = 1.98.