Copper(II) complexes with aminosugar derived Schiff bases as ligands

The reaction of cupric chloride with the Schiff base of methyl 2-amino-2-deoxy-beta-D-glucopyranoside with 2-hydroxynaphthaldehyde gave a copper(II) complex which was characterized by cyclic voltammetry and by FT-IR and electronic spectroscopies. Circular dichroism spectra of this complex and the copper(II) complex with the D-glucosamine derived Schiff base exhibited Cotton effects in the d-d transition region, which is characteristic of a square planar copper(II) environment. The coordination of the Schiff bases to the metal is through the enol-imine tautomeric form. The participation of the hydroxyl groups of the sugar moieties in the complexation is excluded. (C) 1998 Elsevier Science S.A. All rights reserved.