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Complexation of Iron by Dopamine Analogs; A Spectrophotometric and Potentiometric Study

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Author(s): T. Fiaz | N. Fatima | S. Z. A. Zaidi

Journal: Pakistan Journal of Chemistry
ISSN 2220-2625

Volume: 3;
Issue: 2;
Start page: 75;
Date: 2013;
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Keywords: Iron | Dopamine analogs | stoichiometry | Molar absorptivity and Potentiometric analysis

ABSTRACT
The chelation of Bio-essential metal, Iron, with dopamine analogs was studied at 30±2°C. Fe2+ formed intense color complex withthese molecules with an absorbance maxima in visible region. A distinct peak of Fe-Carbidopa complex at 364nm with molarabsorptivity of 1600 M-1 cm-1 was observed while that of Fe-Levodopa and Fe-Methyldopa were observed at 730nm with molarabsorptivities of 306 M-1 cm-1 and 2300 M-1 cm-1, respectively.Potentiometric studies of the complex indicate that Fe(II) forms a 1:3 complex with levodopa and methyldopa while a 1:2complex is found in case of carbidopa. The results obtained are consistent with the spectrophotometric studies.
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