Complexes of hexadentate NSO donor ligands-II. Copper(II) complexes of 1,3-di(o-salicylaldiminophenylthio)propane and 1,2-di(o-salicylaldiminophenylthio)xylene

Article abstract of DOI:10.1016/0277-5387(95)00110-E

The hexadentate dibasic Schiff base ligands 1,3-di(o-salicylaldiminophenylthio)propane (H2DSALPTP) and 1,2-di(o-salicylaldiminophenylthio)xylene(H2DSALPTX), with N2S2O2 donor atoms, reacted with copper(II) salts, Cu X2'.nH2O (X'=Cl, NO3, ClO4 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 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 quasireversible Cu(III)/Cu(II) couples in their cyclic voltammograms at room temperature in dichloromethane solution.