Effect of nitroxide radicals on chemically induced dynamic electron polarization of spin-correlated radical pairs in aqueous micellar solutions of sodium dodecyl sulfate |
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Authors: | V R Gorelik V F Tarasov S R Shakirov E G Bagryanskaya |
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Institution: | (1) International Tomography Center, Siberian Branch of the Russian Academy of Sciences, 3a ul. Institutskaya, 630090 Novosibirsk, Russian Federation;(2) N. N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, 4 ul. Kosygina, 119991 Moscow, Russian Federation |
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Abstract: | The multispin systems consisting of spin-correlated radical pairs (SCRPs) and stable nitroxide radicals, localized in micelles
of sodium dodecyl sulfate (SDS), were studied by ESR and pulse laser photolysis techniques. In all the systems studied, the
stable nitroxide radicals exert no effect on the shape of the ESR spectra of the SCRPs (in particular, on the shape of their
antiphase structure) and on the decay kinetics of the ESR signal of the SCRPs. In the SDS micelles, the electron spin polarization
transfer from the nonequilibrium electron spin states of the molecular triplets (SCRP precursors) is the most efficient mechanism
of generation of the electron spin polarization in nitroxide radicals. The experimental data also show that the nitroxide
radicals and SCRP radicals are most probably distributed uniformly in the micellar phase.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1390–1401, July, 2008. |
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Keywords: | electron spin resonance chemically induced dynamic electron polarization micelles micellized radical pairs spin-correlated radical pairs electron spin polarization transfer |
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