Transition Metal Chemistry of Oxims Containing Ligands, Part XVII Copper (II) Complexes of Quinoline-2-Aldoxime and Isoquinoline-3-Aldoxime

Abstract

Abstract Some copper(II) complexes of the types [Cu(HL)(L)(X)] (where HL = quinoline-2-aldoxime, Hqox, or isoquinoline-3-aldoxime, Hiqox, L = qox− or iqox− and X = C1−, Br−, I−, NO− 3, SCN− or SeCN−), [Cu(HL)2(SO4)]:3H2O (where HL = Hqox or Hiqox) and [Cu(HL)(X)2] (where HL = Hqox or Hiqox and X = Cl−, Br−, NO− 3, NCS−, NCSe− or SO− 4) were synthesized and characterized by analysis, X-ray powder diffraction patterns, e.s.r. reflectance and IR spectral studies. [Cu(HL)(L)(X)] contain cis-square-coplanar [Cu(HL)(L)]+ units, linked by weakly coordinated anions giving infinite polymeric highly distorted octahedral chain structures, whereas [Cu(HL)2(SO4)] complexes have a cis-distorted octahedral structure with two ligand molecules and a bidentate sulphate group. The remaining complexes appear to have less tatragonally polymeric distorted octahedral structures. The polyerystalline e.s.r. spectra indicate the presence of a dx2-y2 ground state in a distorted octahedral ligand field stereochemistry for all the present copper(II) complexes. By using e s r and reflectance spectral data the orbital reduction parameters k¶ and k⊥ are calculated and interpreted in terms of molecular orbital coefficients.