Estimation of the Fraction of Spin-Correlated Radical Ion Pairs in Irradiated Alkanes using Magnetosensitive Recombination Luminescence from Exciplexes Generated upon Recombination of a Probe Pair

Anatoly R. Melnikov, Vladimir N. Verkhovlyuk, Evgeny V. Kalneus, Valeri V. Korolev, Vsevolod I. Borovkov, Peter S. Sherin, Maria P. Davydova, Sergei F. Vasilevsky, Dmitri V. Stass

Результат исследования: Научные публикации в периодических изданияхстатья

5 Цитирования (Scopus)

Аннотация

We suggest a convenient probe exciplex system for studies in radiation spin chemistry based on a novel acceptor-substituted diphenylacetylene, 1-(phenylethynyl)-4-(trifluoromethyl)benzene that has a very short fluorescence lifetime (<200 ps) and low quantum yield (0.01) of intrinsic emission, provides efficient electron capture in alkanes and efficient exciplex formation upon recombination in pair with DMA radical cation, while exhibiting a shifted to red exciplex emission band as compared to the parent system DMA-diphenylacetylene. After chemical, luminescent, radiation and spin-chemical characterization of the new system we used the magnitude of magnetic field effect in its exciplex emission band for experimental estimation of the fraction of spin-correlated radical ion pairs under X-irradiation with upper energy cutoff 40 keV in a set of 11 alkanes. For linear and branched alkanes magnetic field effects and the corresponding fractions are approximately 19-20% and 0.28, while for cyclic alkanes they are lower at 16-17% and 0.22, respectively.

Язык оригиналаанглийский
Страницы (с-по)239-267
Число страниц29
ЖурналZeitschrift fur Physikalische Chemie
Том231
Номер выпуска2
DOI
СостояниеОпубликовано - 1 фев 2017

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