Spectral and structural studies of mono- and binuclear copper(II) complexes of salicylaldehyde N(4)-substituted thiosemicarbazones

摘要

Three copper(II) complexes of salicylaldehyde N(4)-phenyl thiosemicarbazone (H2L1) and two copper(II) complexes of N(4)-cyclohexyl thiosemicarbazone (H2L2) have been synthesized and characterized by different physicochemical techniques like magnetic studies and electronic, infrared and EPR spectral studies. The complexes [(CuL1)(2)] center dot H2O (1) and [(CuL2)(2)] (4) having dimeric structure. The thiosemicarbazones bind to the metal as dianionic ONS donor ligand in all the complexes, except in the complex [Cu(HL1)(2)]center dot H2O (2). In complex 2, the ligand moieties are coordinated as monoanionic (HL-) ones. Two of the complexes [CuL(1)dmbipy]center dot H2O (3) and [CuL2 dmbipy] (5) have been found to possess the stoichiometry [CuLB], where B = 4,4'-dimethyl-2,2'-bipyridine (dmbipy). The coordination geometry around copper(II) in 5 is trigonal bipyramidal distorted square based pyramidal (TBDSBP), as obtained by X-ray diffraction studies. (c) 2006 Elsevier Ltd. All rights reserved.