SYNTHESES AND MOLECULAR-STRUCTURES OF COPPER(II) COMPLEXES WITH 1,3,5-TRIS(PYRAZOL-1-YLMETHYL)BENZENE

A new trifunctional ligand, 1,3,5-tris(pyrazol-1-ylmethyl)benzene (L), has been prepared. It reacts with 1 equivalent of copper(II) perchlorate to form the complex [CuL2(ClO4)2(H2O)2] 1 and with 1.5 equivalents of copper(II) chloride to form [{Cu3L2Cl6(H2O)2}n] 3. The macromolecular complex [{Cu2L2Cl2(ClO4)2(H2O)4}n] 2 was formed by the reaction of 1 with 1 equivalent of CuCl2. Complex 3 can also be prepared from 2 with 1 equivalent of CuCl2 or from 1 with 2 equivalents of CuCl2. The mixed-metal complex [{Cu2CoL2Cl6(H2O)3}n] 4 was prepared from 2 with cobalt(II) chloride. The molecular structures of complexes 1, 2 and 4 have been characterized by X-ray diffraction: 1, monoclinic, space group P2(1), a = 10.255(1), b = 20.218(3), c = 10.316(2) angstrom, beta = 106.21(1)-degrees, Z = 2; 2, monoclinic, space group P2(1)/c, a = 11.288(2), b = 13.633(3), c = 15.173(3) angstrom, beta = 104.635(15)-degrees, Z = 2; 4, monoclinic, space group C2/c, a = 7.473(3), b = 22.137(7), c = 28.155(10) angstrom, beta = 96.21(3)-degrees, Z = 4. The co-ordination sphere of copper(II) in 1 and 2 is distorted square pyramidal and 2-4 have polymeric structures.