Ion—molecular charge transfer as studied by the method of optically detected ESR of radical pairs

Saik, Vladimir O.; Lukzen, Nikita N.; Grigoryants, Vladimir M.; Анисимов, О. А.; Doktorov, A.B.; Molin, Yu. N.

doi:10.1016/0301-0104(84)85191-5

Cited by 59 publications

(16 citation statements)

References 6 publications

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“…Spin dephasing due to this reaction has been previously observed ͑using optically detected ESR͒ with a rate constant of 1.2ϫ10 9 M Ϫ1 s Ϫ1 in liquid squalane. 16,25 Additionally, magnetic-field studies similar to ours, but using x-ray excitation of squalane report an increase in the zero-field resonance of C 6 F 6 with increasing concentration. A charge exchange rate constant of 2.5ϫ10 9 M Ϫ1 s Ϫ1 was extracted from the low-concentration data (cϽ0.1 M) which, however, at higher concentrations declined to ϳ1.3 ϫ10 9 M Ϫ1 s Ϫ1 .…”

Section: ͑7͒supporting

confidence: 66%

Magnetic-field effects on the recombination fluorescence of anthracene cation and perfluorocarbon anions

Grigoryants

McGrane

Lipsky

1998

The Journal of Chemical Physics

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Articles you may be interested inMagnetic field effects in singlet-polaron quenching in molecularly doped fluorescence organic light-emitting diodes J. Appl. Phys. 116, 064308 (2014); 10.1063/1.4892625Hyperfine interaction mechanism of magnetic field effects in sequential fluorophore and exciplex fluorescence D 1 ( 2 B 2g )→D 0 ( 2 A u ) fluorescence from the matrix-isolated perylene cation following laser excitation into the D 5 ( 2 B 3g ) and D 2 ( 2 B 3g ) electronic states Yield determination of OH (v=0,1) radicals produced by the electron-ion recombination of protonated moleculesThe recombination fluorescence from anthracene that has been photoionized at 188 nm in isooctane solutions containing low concentrations of either perfluorocyclobutane (C 4 F 8 ) or perfluorobenzene (C 6 F 6 ) has been examined as a function of magnetic-field strength. Level crossing resonances are found at magnetic-field positions predicted by the theory of a hyperfine driven spin evolution on the perfluoroanion ͑i.e., 0, 452, 757, and 903 G for C 4 F 8 and at 0, 411, and 822 G for C 6 F 6 ͒. The widths of the zero-field resonances have been studied as a function of perfluorocarbon concentration. For perfluorocyclobutane, the peak to peak widths of the derivative spectra vary from 6.8 to 13 G over a concentration range from 0.005 to 0.21 M. This variation is quantitatively predicted using the analytic solution to the time-dependent diffusion equation in a Coulomb field to determine how the distribution function for thermalized electron-cation distances evolves into its concentration dependent counterpart for anion-cation separation distances. For perfluorobenzene, the widths are observed to vary over a wider range from 3.0 to 38.5 G for concentrations from 0.0044 to 0.13 M. The additional concentration broadening in this case is consistent with previous estimates of the spin-dephasing rate constant for C 6 F 6 -C 6 F 6 Ϫ charge exchange.

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Section: ͑7͒supporting

confidence: 66%

Magnetic-field effects on the recombination fluorescence of anthracene cation and perfluorocarbon anions

Grigoryants

McGrane

Lipsky

1998

The Journal of Chemical Physics

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“…In the general case, a precise analysis of OD ESR spectral variations due to reactions (8), (9) is quite a problem. However, in the conditions of our experiments, the shape of the OD ESR spectrum is fairly well described in terms of the Zeeman transitions in crossing constant and microwave magnetic fields independently for radical-cation and -anion spins [11,12], which case is analogous to that of normal ESR. Therefore, it proves to be possible to employ sta- Table 1. tionary solutions of the MeConnel equations [13] to simulate OD ESR spectra.…”

Section: Discussionmentioning

confidence: 69%

Fast Reactions Involving Radical-Cations During their Geminate Recombination as Studied by the OD ESR Method

Saik

Анисимов

Lozovoy

et al. 1985

Zeitschrift Für Naturforschung A

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The new method of optically detected ESR (OD ESR) of radical-ion pairs has been used to study fast radical-cation reactions in non-polar liquid solutions. Dimeric radical-cations have been observed to occur within the time of geminate recombination with radical-ions; their generation rate has been determined. The spectral line broadening with increasing acceptor concentration has been associated with ion-molecular charge transfer; the rate of this process has also been determined.

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“…It is shown [11] that within the range of small H 1 values the individual lines of the OD ESR spectrum, corresponding to a given nuclear configuration, display the Lorentzian…”

Section: Od Esr Measurementsmentioning

confidence: 99%

“…In this paper, however, the T 1 relaxation is neglected, i.e., actually the case of Tl~,c >> T2a,c is considered. To allow for the influence of longitudinal relaxation, it is suffice to substitute the expression (bz(t)) = bz(O)exp(-t/Tlb ) to formulas (11) of [11] which is an approximate solu- …”

Section: Od Esr Measurementsmentioning

confidence: 99%

Spin relaxation parameters in recombining radical ion pair (diphenylsulfide-d10)+/(p-Terphenyl-d14)− obtained by OD ESR and quantum beats techniques

et al. 1997

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Abstraet. Parameters of paramagnetic relaxation were determined by OD ESR and quantum beats techniques for a recombining pair of radical ions (DPS-d10)+/(PTP-d14) -in n-hexane, isooctane, cisdecalin, and squalane solutions. The T 2 relaxation time determined by quantum beats technique is independent of solvent viscosity and magnetic field strength in the range 170-9600 G. These data are in agreement with the results obtained by OD ESR technique assuming fast T~ relaxation for radical cation. Neglecting the contribution of radical anion relaxation, we obtained T~c = T2c ~ 50 ns for (DPS-dl0) +.

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Ion—molecular charge transfer as studied by the method of optically detected ESR of radical pairs

Cited by 59 publications

References 6 publications

Magnetic-field effects on the recombination fluorescence of anthracene cation and perfluorocarbon anions

Magnetic-field effects on the recombination fluorescence of anthracene cation and perfluorocarbon anions

Fast Reactions Involving Radical-Cations During their Geminate Recombination as Studied by the OD ESR Method

Spin relaxation parameters in recombining radical ion pair (diphenylsulfide-d10)+/(p-Terphenyl-d14)− obtained by OD ESR and quantum beats techniques

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