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“Micellar catalysis on the electron transfer reactions of iron(III)-polypyridyl complexes with sulfur-containing amino acids”

K. John Adaikalasamy, Seenivasan Rajagopal, A. Jancirani, Y. Brightson Arul Jacob, and Thayalaraj Christopher Jeyakumar

Postgraduate & Research Department of Chemistry, The American College, Madurai, India

 

E-mail: johnadaikala@gmail.com

Received: 22 November 2021  Accepted: 8 March 2022

Abstract:

The kinetics of anionic, cationic, neutral surfactant and catalyzed Fe(III) polypyridyl complex were studied. The kinetics of Fe(NN)33+ oxidation of amino acids was followed spectrophotometrically in the presence and absence of surfactants, and also the values of the binding constant, of different sulfur-containing amino acids with surfactants, were determined. The redox reaction has been carried out in an aqueous medium, and the addition of acetonitrile facilitates the reaction initially. Electron transfer (ET) mechanism for the Fe(NN)33+ oxidation of amino acids containing thiol and thioether moiety is studied. The kinetic data obtained for the reaction in the presence of different concentrations of SDS, CTAB and Triton x-100 for Fe(NN)33+ oxidation of several amino acids are collected. In the presence of SDS, the sulfate head group can stabilize sulfide cation of the transition state in the ET reaction of Fe(NN)33+ with sulfide formed due to ET from sulfide to Fe(NN)33+. Among the thiol-containing amino acids, glutathione shows more pronounced catalysis. Compared to Fe(bpy)33+, the reaction of Fe(phen)33+ with sulfur-containing amino acids is favored in SDS. ET reaction of [Fe(NN)3]3+ with sulfur-containing amino acids is in the presence of CTAB and nonionic surfactant, Triton-x also studied.

Keywords: Electron transfer reactions; Iron(iii)-polypyridyl complexes; Micellar catalysis; Surfactants

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-022-02165-5

 

Chemical Papers 76 (7) 4225–4234 (2022)

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