Spectral and structural studies of mono- and binuclear copper(II) complexes of salicylaldehyde N(4)-substituted thiosemicarbazones
نویسنده
چکیده
Three copper(II) complexes of salicylaldehyde N(4)-phenyl thiosemicarbazone (H2L ) and two copper(II) complexes of N(4)-cyclohexyl thiosemicarbazone (H2L ) have been synthesized and characterized by different physicochemical techniques like magnetic studies and electronic, infrared and EPR spectral studies. The complexes 1⁄2ðCuL1Þ2 12H2O ð1Þ and [(CuL )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(HL)2] Æ H2O (2). In complex 2, the ligand moieties are coordinated as monoanionic (HL ) ones. Two of the complexes [CuLdmbipy] Æ H2O (3) and [CuLdmbipy] (5) have been found to possess the stoichiometry [CuLB], where B = 4,4 0-dimethyl-2,2 0-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. 2006 Elsevier Ltd. All rights reserved.
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