Synthesis and characterization of Fe(III), Co(III), Cu(II) and Zn(II) complexes of N-2,4-hydroxybenzal-D-glucosamine

The Schiff base N-2,4-dihydroxybenzal-D-glucosamine (L), and its Fe(III), C o(III), Cu(II) and Zn(II) complexes have been synthesized and characterized . Magnetic moments suggest that all complexes are high-spin. The Cu(II) che late in DMF solution has a distorted tetrahedral structure, as shown by ESR and electronic spectra. Detailed studies have been made concerning the sol ution equilibrium of L with transition metal ions. Stabilities of the compl exes are in accord with the Irving-Williams series.