Complexes of hexadentate NSO donor ligands - III. Nickel(II) complexes of 1,3-di(o-salicylaldiminophenylthio)propane and 1,2-di(o-salicylaldiminophenylthio)xylene
Nickel(II) complexes of the hexadentate N2S2O2 donor ligands, 1,3-di(o-salicylaldiminophenylthio)propane (H(2)DSALPTP) and 1,2-di(o-salicylaldiminophenylthio)xylene (H(2)DSALPTX) have been synthesised and characterised. H(2)DSALPTP reacted with NiCl2.6H(2)O or Ni(ClO4)(2).6H(2)O in presence of ammonia to give the complex [Ni(DSALPTP)] (1). H(2)DSALPTX reacted smoothly with N(ClO4)(2) to yield the corresponding complex [Ni(DSALPTX)] (2). The ligand did not react with NiCl2 in the absence of ammonia but in its presence produced the complex (2). The molecular and crystal structure;of [Ni(DSAL PTX)] exhibits a very unusual deployment of the six donor sites of the ligand. It crystallises in the orthorhombic system with space group P2(1)2(1)2(1). In dichloromethane solution both the complexes are found to exhibit Ni(II)/Ni(III) redox couples in their cyclic voltammograms at room temperature with E-1/2 values 0.87 and 0.78 V (vs. Ag/AgCl). (C) 1998 Elsevier Science Ltd. All rights reserved
