In the present study interaction of Fe(II) and Fe(III) with antiparkinsonian drug molecule, Levodopa (LD), is investigated using
potentiometry and spectrophotometry. Identical spectra of both of Fe(II) and Fe(III) complexes of the drug provide an evidence that similar
stoichiometry was followed. Molar absorptivities of the complexes, found to be more than 100 M-1
cm-1
, showed charge transfer spectra.
Addition of an antioxidant decolorized the initial intensive color of the Fe(III) complex, which was evidence of high oxidation state of iron.
Catecholic ligands, being strong reductants, chelate a metal ion in high oxidation state and show LMCT bands. These observations lead to
conclude that iron has high oxidation state, regardless of initial source of metal.
Key words: Levodopa; iron(II) and iron(III) chelate; UV-VIS study
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