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<p>We report the Heisenberg spin-exchange of electro-neutral and negatively charged spin probes in the room-temperature ionic liquids (RTILs) investigations in a wide temperature range. The contributions of spin-exchange and dipole–dipole interactions of radicals into EPR spectrum line shape were separated by analyzing the temperature dependence of the concentration line broadening. Translational diffusion coefficients and effective activation energy of translational mobility were determined and compared with rotational correlation times and effective activation energy of rotational mobility. Formation of charged and uncharged domains in RTILs was clearly demonstrated by comparing the dynamic parameters for charged and uncharged probes. The influence of repeated collisions of radicals in the matrix cage on spin exchange was specially studied.</p>

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Structural Heterogeneity of Ionic Liquids Using Spin-Exchange Interaction Between Spin Probes

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Natalia A. Chumakova,
  • Alexander I. Kokorin

摘要

We report the Heisenberg spin-exchange of electro-neutral and negatively charged spin probes in the room-temperature ionic liquids (RTILs) investigations in a wide temperature range. The contributions of spin-exchange and dipole–dipole interactions of radicals into EPR spectrum line shape were separated by analyzing the temperature dependence of the concentration line broadening. Translational diffusion coefficients and effective activation energy of translational mobility were determined and compared with rotational correlation times and effective activation energy of rotational mobility. Formation of charged and uncharged domains in RTILs was clearly demonstrated by comparing the dynamic parameters for charged and uncharged probes. The influence of repeated collisions of radicals in the matrix cage on spin exchange was specially studied.