Abstract
Iron(III)–salen complexes catalyze the H2O2 oxidation of various ring-substituted anilines in MeCN have been studied, and [O=FeIV(salen)]+· is proposed as the active species. Study of the kinetics of the reaction by spectrophotometry shows the emergence of a new peak at 445 nm in the spectrum which corresponds to azobenzene. Further oxidation of azobenzene by H2O2 leads to the formation of azoxybenzene. ESI–MS studies also support the formation of these products. The rate constants for the oxidation of meta- and para-substituted anilines were determined from the rate of decay of oxidant as well as the rate of formation of azobenzene, and the reaction follows Michaelis–Menten kinetics. The rate data show a linear relationship with the Hammett σ constants and yield a ρ value of −1.1 to −2.4 for substituent variation in the anilines. A reaction mechanism involving electron transfer from aniline to [O=Fe(salen)]+· is proposed. The presence of axial ligands modulates the activity of the complex.
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Acknowledgments
S. R. thanks DST for providing financial assistance in the form of project and UGC for sanctioning the DRS project for the School of Chemistry from which the instruments used for the study were procured. A. M. A. thanks UGC, the Principal and the Management, M. S. S. Wakf Board College, Madurai, for sanctioning leave under the FIP program.
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Aslam, A.M., Rajagopal, S., Vairamani, M. et al. Iron(III)–salen–H2O2 as a peroxidase model: electron transfer reactions with anilines. Transition Met Chem 36, 751–759 (2011). https://doi.org/10.1007/s11243-011-9529-4
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DOI: https://doi.org/10.1007/s11243-011-9529-4