Optical Properties and Structures of Metal Complexes of Schiff Bases obtained from Substituted Salicylaldehydes and Amino Sugars

Abstract

Nickel (II) and copper (II) complexes of amino sugars (glucosamine, galactosamine, and mannosamine) derived from salicylaldehyde or its derivatives have been newly synthesized and characterized. In these metal complexes, the Schiff bases are tridentate, the nickel (II) complexes are octahedral, and the copper (II) complexes are tetrahedral or pseudotetrahedral except for Cu (II) (N-salicylidene mannosamine)₂, which is nearly planar. The nickel (II) and copper (II) complexes of N-salicylidene mannosamine show electronic spectra, magnetic moments, and circular dichroism spectra which are different from those of the complexes of N-salicylidene glucosamine and -galactosamine.