ABSTRACT
The study of coordination chemistry of mixed-ligand complexes especially metal complexes of chelating agents with functional groups specifically identical with those present in enzymes has provided useful information about their binding tendency which could be exploited in various analytical and biological reactions. This research investigated spectroscopic properties of mixed-ligand complexes of Co(II) and Mn(II) with tyrosine, methionine and thiobarbituric acid using elemental analysis, metal analysis, solubility test, infrared and UV-Visible spectroscopy. The results of elemental and metal analysis ascertained the molecular masses of the complexes and the formation of 1:1:1 metal to ligands ratio. The complexes were insoluble in the tested solvent except dimethylsuphoxide where they are soluble. IR spectral suggested coordination of the ligands to the metal ions through nitrogen and oxygen donor atoms. UV-Visible analysis revealed tentative octahedral geometry for the complexes. It is concluded that the information provided in this study could be useful in characterizing newly synthesized chelating agents.
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