Synthesis and Crystal Structure of a new Cu2+ complex

(R,R)-N,N'-di-(4-hydroxylbenzal)-1,2-cyclohexanediamine Schiff base(H2L) was synthesized and characterized by H-1 NMR. spectra, MS spectra and 1R spectra. And the coordination reaction of H2L with chlorate of Cu(II) was studied. The reaction of H2L with Cull salt [CuCl2] generates a new compound, the title compound. The title compound was determined by IR spectra, elemental analysis and single-crystal X-ray diffraction. The title compound belongs to the monoclinic system, space group P2(1), with a = 6.6393(6)angstrom, b=24.735(2)angstrom, c = 8.1128(7)angstrom, alpha=90.00 degrees,beta=110.1670(10) degrees, gamma=90.00, Z=2, V=1250.60(19) angstrom(3), Dc=1.382 mg.m(-3), mu=1.020mm(-1),F (000)=554, R=0.0351 and wR=0.0887. There are five coordination sites around Cu2+ of the title compound, which are respectively occupied by one oxygen atom from one H2O molecule and four nitrogen atoms from two 1,2-cyclohexanediamine molecules. The Cu atom and four chelating nitrogen atoms are coplanar. There exist rich intra-molecular H-bond and intermolecular H-bond, which result in a three dimensional net.