Abstract
The syntheses of the mixed-ligand complexes between alloxan and glycine with bivalent metals (Cu, Ni, Co, Zn, Pb, and Cd) were made by mixing them in the ratios of 1: 1: 1 at pH 3 and by allowing to stand at a room temperature for about a week. The objective products deposited gradually. The separation from their parent complexes, i.e., bisglycinato metal complexes, were made by the differences of solubility in H2O. By decomposing the mixed-ligand complexes in 1N HCl, the constituents were identified by thinlayer chromatography with employing microcrystalline cellulose powder as an adsorbent and BuOH: AcOH: H2O (4: 1: 2) as a solvent mixture. The discussions as to the binding sites with the ligands were made from infrared (IR) spectra and the structures were postulated of the alloxan-metal-glycine and alloxan-Cu-glycylglycine complexes.
