Abstract
The hexadentate dibasic Schiff base ligands 1,3-di( o-salicylaldiminophenylthio)propane (H 2DSALPTP) and 1,2-di( o-salicylaldiminophenylthio)xylene (H 2DSALPTX), with N 2S 2O 2 donor atoms, reacted with copper(II) salts, CuX 2′ · nH 2O (X′ = Cl, NO 3, ClO 4 and n = 2, 3, and 6, respectively), to give complexes in which the flexidentate nature of the ligands is manifested in their action as monobasic tridentate chelating agents, leaving one-half of the ligands free. In all these complexes the copper(II) acceptor centre is present in a square-planar environment, the fourth coordination site being occupied either by a chloride ion or a water molecule. The EPR parameters (lowest g < 2.03) indicate their rhombic symmetry. All the complexes are found to exhibit quasi-reversible Cu III/Cu II couples in their cyclic voltammograms at room temperature in dichloromethane solution.
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