Synthesis and crystal structure of copper(II) complex with Schiff base from salicylaldehyde and 1,2-phenylenediamine

The Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Guangxi Normal University), Ministry of Education of China, School of Chemistry and Chemical Engineering of Guangxi Normal University, Guilin 541004, China E-mail : chenzfgxnu@yahoo.com School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China Manuscript received 19 January 2009, accepted 21 July 2009 A new complex [Cu(saloph)]{[Cu(salobp)2]CI) (I) was synthesized by the reaction of CuCI and the Schiff base ligand (saloph) derived from salicylaldehyde and 1,2-phenylenediamine. Under hydrothermal conditions, in the presence of Cu1 ion and methanol, saloph is converted into the benzimidazole ligand (salobp). The single crystal X-ray diffraction analyses reveal that 1 contains discrete [Cu(saloph)] (A), [Cu(salobp)2]CI (B) in the asymmetric unit. In A, the geometry around the CuII is almost square planar with two nitrogens and two oxygens from saloph providing the tetradentate coordination, while in B, the geometry around the Cull is linear with two nitrogens from two different monodentate benzimidazole ligands (salobp)