THE CRYSTAL-STRUCTURES AND ELECTROCHEMICAL STUDIES OF 2 NAPHTHALENIC SCHIFF-BASE COPPER(II) COMPLEXES

The Schiff base ligands, 2-hydroxy-N-cyclohexyl-1-naphthaldimine (I), and 3-hydroxy-N-cyclohexyl-1-naphthaldimine (II), and their correspond ing Cu-II complexes (1-2) respectively were synthesized and characteri zed. The crystal and molecular structures of oxo-1H-naphth-1-ylidene)- methyl]aminato}copper(II) (1) and hexyl)[(3=oxo-2H-naphth-2-ylidene)-m ethyl]aminato} copper(II) (2), were determined. The X-ray diffraction study shows that the geometry around the metal atom for (1), is steppe d square planar with a step of 1.063 Angstrom while for (2), the geome try around the metal atom is distorted square planar with an angle bet ween the coordination planes O(1)-Cu-N(1) and O(1a)-Cu-N(1a) of 39.9 d egrees. Electrochemical studies show a dependence of the Cu-II/Cu-I po tentials on the ligand structure. (C) 1997 Elsevier Science Ltd.