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Radical pair dynamics in anionic micelles with different alkyl chain length as studied by pulse-mode product-yield-detected ESR

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Abstract

Dynamics of the radical pair composed of benzophenone ketyl radical and an alkyl radical of surfactant molecule in the micellar solution were studied by means of the pulse-mode product-yield-detected electron spin resonance (pulse-PYESR) technique. As the surfactants heptyl (C7), nonyl (C9), decyl (C10) and dodecyl (C12) sulfates were employed. Both the escape rate and the recombination rate of the radical pair decreased monotonously with increasing the alkyl-chain length from C7 to C12. A close relation between the escape rate and the critical micellar concentration divided by the aggregation number and also that between the recombination rate and internal viscosity of micelle are pointed out. The pulse-PYESR analysis on the radical pair containing the alkyl radical of surfactant molecule as one of the components is very powerful in extracting the kinetic constants of micelle, since the alkyl sulfate radical is an ideal probe for the micelle molecule.

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Authors and Affiliations

  1. Department of Chemistry, National Industrial Research Institute of Nagoya, Nagoya, Japan

    Y. Konishi & M. Okazaki

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  1. Y. Konishi
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  2. M. Okazaki
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Konishi, Y., Okazaki, M. Radical pair dynamics in anionic micelles with different alkyl chain length as studied by pulse-mode product-yield-detected ESR. Appl. Magn. Reson. 17, 597–608 (1999). https://doi.org/10.1007/BF03162089

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