Abstract

The characteristic features of the SNP and RYDMR spectra of radical pairs (RPs) in micelles and biradicals are analysed in a number of models. It is shown that recently found decrease of the SNP and RYDMR line splittings in these systems is, in general, explained by the fast ST dephasing (STD). Within a simple but reasonable model of spin-space dynamics of RPs, it is demonstrated that STD is most probably induced by the exchange interaction. Recently proposed high reactivity mechanism of the above-mentioned decrease is only a particular and rather artificial way to introduce fast STD which, in addition, is less effective than the exchange interaction mechanism.

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