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

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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. et al.

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

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{c6fa39fb737044228996854f3461f1a3,

title = "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",

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.",

keywords = "Diphenylacetylene, exciplex luminescence, magnetic field effect, radical ion pair, spin correlation, X-ray irradiation",

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

year = "2017",

month = feb,

day = "1",

doi = "10.1515/zpch-2016-0819",

language = "English",

volume = "231",

pages = "239--267",

journal = "Zeitschrift fur Physikalische Chemie",

issn = "0942-9352",

publisher = "Walter de Gruyter GmbH",

number = "2",

}

RIS

TY - JOUR

T1 - 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

AU - Melnikov, Anatoly R.

AU - Verkhovlyuk, Vladimir N.

AU - Kalneus, Evgeny V.

AU - Korolev, Valeri V.

AU - Borovkov, Vsevolod I.

AU - Sherin, Peter S.

AU - Davydova, Maria P.

AU - Vasilevsky, Sergei F.

AU - Stass, Dmitri V.

PY - 2017/2/1

Y1 - 2017/2/1

N2 - 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.

AB - 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.

KW - Diphenylacetylene

KW - exciplex luminescence

KW - magnetic field effect

KW - radical ion pair

KW - spin correlation

KW - X-ray irradiation

UR - http://www.scopus.com/inward/record.url?scp=85012233023&partnerID=8YFLogxK

U2 - 10.1515/zpch-2016-0819

DO - 10.1515/zpch-2016-0819

M3 - Article

AN - SCOPUS:85012233023

VL - 231

SP - 239

EP - 267

JO - Zeitschrift fur Physikalische Chemie

JF - Zeitschrift fur Physikalische Chemie

SN - 0942-9352

IS - 2

ER -

ID: 9032071