[Cu4(L)2(O2CMe)2] H2O (L = 1,3-bis(5-bromo-2-hydroxybenzylidene)propan-2-ol) was synthesized and its crystal structure determined. (C38H34N4O10Br4Cu4)·H2O, monoclinic, space group P21/c, a = 21.072(5), b = 9.673(2), c = 21.934(4) Å, β = 109.73(2)°, V = 4208(2) Å3, Z = 4. The crystal structure consists of two independent binuclear copper(II) complexes and the non-coordinating water molecule in the asymetric unit. The Cu(II) ions are in a square-planar geometry and coordinated by donor atoms of the ligand (NO3).
The average Cu···Cu distance and average Cu-O-Cu angle are 3.491(2) Å and 132.0(1)°, respectively. Temperature-dependent magnetic susceptibility measurements of the complex show an intramolecular anti ferromagnetic coupling in the dimeric Cu(II) core. The fitting parameters are -2J = 174.4 cm-1, g = 1.98.
平均Cu···Cu距离和平均Cu-O-Cu角分别为3.491(2) Å和132.0(1)°。该配合物的温度依赖磁化率测量表明,二核Cu(II)核心中存在分子内反铁磁耦合。拟合参数为-2J = 174.4 cm-1,g = 1.98。
A nickel(II) complex, [Ni2(L)(3,5-prz)], (L = 1,3-bis(2-hydroxy-5-bromosalicylidene amino) propan-2-ol; 3,5-prz = 3,5-dimethylpyrazolate), was synthesized and characterized by means of elemental analysis, infrared and electronic spectra. The crystal structure of the complex has been determined by X-ray diffraction. The nickel(II) ions are bridged by the alkoxo group of the ligand and the N atoms of the μ-pyrazolate group. Each nickel ion is coordinated by two O atoms and two N atoms, forming a square with trans-N2O2 geometry.