摘要:
Mononuclear and binuclear copper(II) complexes (1-8) with two ONS donor thiosemicarbazone ligands {salicylaldehyde3-hexamethyleneiminyl thiosemicarbazone [H2L1] and salicylaldehyde 3-tetramethyleneiminyl thiosemicarbazone [H2L2]} have been prepared and physico-chemically characterized. IR, electronic and EPR spectra of the complexes have been obtained. The thiosemicarbazones bind to metal as dianionic ONS donor ligands in all the complexes except in [Cu(HL1)(2)] (2) and [Cu(HL2)(2)] (6). In compounds 2 and 6 the ligands are coordinated as monoanionic HL- ones. The magnetic susceptibility measurements indicate that all the complexes are paramagnetic. In complex [(CuL1)(2)] (1), the magnetic moment value is lower than the expected spin only value. In all the complexes g(parallel to) > g(perpendicular to) > 2.0023 and G values within the range 2.5-3.5 are consistent with d(x2-y2) ground state. The complexes were given the formula as [(CuL1)(2)] (1); [Cu(HL1)(2)] (2); [CuL(1)bpy] (3); [CuL(1)phen] (4); [CuL1-gamma-pic]center dot 2H(2)O (5); [Cu(HL2)(2)] (6); [CuL(2)py]center dot 3H(2)O (7); [CuL(2)bipy] (8). The structure of the compound 8 have been solved by single crystal X-ray crystallography and was found to be distorted square pyramid around copper(II) ion. (C) 2007 Elsevier B.V. All rights reserved.