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Kinetic studies on promazine oxidation by FeIII/CuII in acidic aqueous bromide solutions. Spectroscopic and kinetic non-additivity as evidence for the CuII–Br–FeIII-type heterobimetallic complex formation

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Abstract

The formation of CuII–Br–FeIII-type heterobimetallic complexes was observed spectrophotometrically, given the non-additivity of the spectra from the copper(II) and iron(III) complexes. The kinetics of the oxidation of promazine radical (ptz+•) to promazine 5-oxide, by iron(III) bromides, copper(II) bromides, and a mixture of these complexes in acidic aqueous solutions, have been studied using UV–Vis spectroscopy at I = 1.0 M (H+, Cu2+, Fe3+, Br−) and T = 318 K. Copper(II) inhibits the oxidation of the promazine radical to promazine sulfoxide using iron(III) complexes. A rate retardation effect, characterized by the dependence of the pseudo second-order rate constant (k II) on the copper(II) concentration k II = a/(1 + b[CuII]), can be rationalized as a result of CuII–Br–FeIII-type heterobimetallic complex formation.

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Authors and Affiliations

  1. Department of Chemistry, N. Copernicus University, Toruń, 87-100, Poland

    Adrian Topolski, Monika Lipińska, Przemysław Kita & Joanna Wiśniewska

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  1. Adrian Topolski
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  2. Monika Lipińska
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  3. Przemysław Kita
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  4. Joanna Wiśniewska
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Correspondence to Adrian Topolski.

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Topolski, A., Lipińska, M., Kita, P. et al. Kinetic studies on promazine oxidation by FeIII/CuII in acidic aqueous bromide solutions. Spectroscopic and kinetic non-additivity as evidence for the CuII–Br–FeIII-type heterobimetallic complex formation. Transition Met Chem 33, 843–847 (2008). https://doi.org/10.1007/s11243-008-9120-9

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