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

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)239-267
Number of pages29
JournalZeitschrift fur Physikalische Chemie
Volume231
Issue number2
DOIs
Publication statusPublished - 1 Feb 2017
Externally publishedYes

Fingerprint

Alkanes
alkanes
Luminescence
Ions
luminescence
Magnetic field effects
probes
Dynamic mechanical analysis
ions
Radiation
Quantum yield
radiation
Benzene
electron capture
magnetic fields
Cations
cut-off
Fluorescence
benzene
Irradiation

Keywords

  • Diphenylacetylene
  • exciplex luminescence
  • magnetic field effect
  • radical ion pair
  • spin correlation
  • X-ray irradiation

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

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

In: Zeitschrift fur Physikalische Chemie, Vol. 231, No. 2, 01.02.2017, p. 239-267.

Research output: Contribution to journalArticle

Melnikov, Anatoly R. ; Verkhovlyuk, Vladimir N. ; Kalneus, Evgeny V. ; Korolev, Valeri V. ; Borovkov, Vsevolod I. ; Sherin, Peter S. ; Davydova, Maria P. ; Vasilevsky, Sergei F. ; Stass, Dmitri V. / 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. In: Zeitschrift fur Physikalische Chemie. 2017 ; Vol. 231, No. 2. pp. 239-267.
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