Radical cations of n-alkanes in irradiated solutions as studied by time-resolved magnetic field effects

Autor:	V. A. Bagryansky, Vsevolod I. Borovkov, Yu. N. Molin, I. V. Yeletskikh
Rok vydání:	2002
Předmět:	Chemistry Biophysics Analytical chemistry Condensed Matter Physics Plateau (mathematics) Fluorescence Magnetic field chemistry.chemical_compound Radical ion Irradiation Physics::Chemical Physics Physical and Theoretical Chemistry Molecular Biology Hyperfine structure Recombination Methyl group
Zdroj:	Molecular Physics. 100:1379-1384
ISSN:	1362-3028 0026-8976
DOI:	10.1080/00268970110117908
Popis:	The time-resolved magnetic field effect in the recombination fluorescence of spin-correlated radical ion pairs has been measured to study n-alkane radical cations in irradiated solutions at room temperature. The magnetic field effect was recorded as a ratio of fluorescence decay curves in the 0.1 T and zero magnetic fields for solutions of C8, C9, C10, C12, and C16 n-alkanes in n-hexane with addition of 3 × 10−5 M p-terphenyl-d 14. A distinct maximum at 10–30 ns followed by a slowly decaying plateau was observed for all the solutions. Simulation shows that the maximum corresponds to an unresolved ESR spectrum with the peak-to-peak line-width ranging from about 1.6mT to 0.5mT for C8 to C16 radical cations. The unresolved structure is believed to result from the hyperfine couplings with many protons of the radical cation, the increase in the number of interacting protons compared with low temperature matrices being caused by the methyl group rotation and conformational motion of the carbon chain. With incre...
Databáze:	OpenAIRE
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