Synthesis of metal-chelates of amino sugars: Schiff's base complexes

Abstract

Metal-complexing, salicylaldimine ligands 4, 7, 8, and 9 have been synthesized from 2-amino-2-deoxy-D-glucopyranose and some of its derivatives with salicylaldehyde and 3-formyl-2-hydroxybenzoic acid. Copper(II), zinc, and cobalt(II) complexes were formed from ligand 7, whereas only copper(II) would complex with ligand 8. The sugar ligand 4 forms a water-soluble complex with copper(II) and ligand 9 forms a binuclear copper(II) complex. These products have been studied by 1 H nmr, visible absorption, and esr spectroscopy, mass spectrometry, and by their magnetic moment data.