STUDIES OF COORDINATION-COMPOUNDS OF CADMIUM(II) AND ZINC(II) WITH L-AMINO-ACIDS AS PRIMARY LIGANDS AND VITAMIN-B-6 (PYRIDOXINE) AS SECONDARY LIGAND - A POLAROGRAPHIC APPROACH

Polarographic technique has been used to determine the mixed ligand co mplex formation between Cd-II and Zn-II with L-tyrosine, L-arginine, L -methionine, L-hydroxytryptophane, L-tryptophane, L-hydroxyproline, L- proline and L-histidine as primary ligands and vitamin B-6 as a second ary ligands. Cd-II and Zn-II formed 1 : 1 : 1, 1 : 1 : 2 and 1 : 2 : 1 complexes. The stability trend of the complexes have been explained o n the basis of bonding, basicity and steric hindrance.