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Abstract

A series of lanthanide metal (III) complexes have been prepared from the new azo ligand, 3-(1-methyl-2-benzimidazolylazo)-Tyrosine (MBT). The structural features were confirmed on the basis of their elemental analysis, metal content, molar conductance, magnetic measurement, FTIR, 1H NMR, and UV-Vis spectra studies. The isolated complexes were found to have a mole ratio (1:2) (metal:ligand) stoichiometry with the general formula [Ln(MBT)2]Cl (Ln(III) = La, Ce, Pr, Nd, Sm, Eu, and Gd). The chelates were found to have octahedral structures. The FTIR spectra show that the ligand (MBT) is coordinated to lanthanide ions as a N, N, O-tridentate anion via benzimidazole nitrogen, azo nitrogen, and oxygen of hydroxyl after deprotonation. Complex formation in solution was performed after fixing the optimum pH, molar concentration, and time. Beer's law was obeyed over a range (7-9x10-5) with high molar absorptivity for all the prepared complexes solutions. Stability constant and Gibbs free energy were also determined. The ligand (MBT) and its prepared complexes were screened in vitro against two types of selected bacteria.

Keywords

Benzimidazolylazo, lanthanide (III) ions, Structural Studies, Biological Evaluation.

Article Type

Supplemental Issue

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