Charge Transfer in the Radiolysis of Dilute Solutions of Hydrocarbons in Krypton Matrices at 77 °k

Stone, John A.

doi:10.1139/v65-108

Cited by 12 publications

(11 citation statements)

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“…Armstrong "molecular" yield in the solid at low temperature et al (20) have discussed the difficulties involved and that there may be two or more distinguishfor HC1 gas. Thus reaction [8] can only occur if able types of C6H12*. C2F6 did not affect any the energetics in the liquid are very much yield, and so appears not to attach electrons at different from those in the gas phase, so that low temperature.…”

mentioning

confidence: 93%

“…reaction [8] is extremely endothermic. Electrons Thus at the low temperature where the ions are initially formed with several eV excess begin to diffuse in the solid, it would appear that energy and are moderated by collision to thermal reaction [8] does not occur and that the anion energies.…”

mentioning

confidence: 99%

“…Electrons Thus at the low temperature where the ions are initially formed with several eV excess begin to diffuse in the solid, it would appear that energy and are moderated by collision to thermal reaction [8] does not occur and that the anion energies. It might be thought that electrons could and cation neutralize each other with little bond react with solute before being moderated to breaking.…”

mentioning

confidence: 99%

“…C2F6 did not affect any the energetics in the liquid are very much yield, and so appears not to attach electrons at different from those in the gas phase, so that low temperature. reaction [8] becomes thermoneutral or exothermic in the liquid. This is quite possible since Acknowledgments Claridge and Willard (21) The amount of dissociation may be measured…”

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confidence: 99%

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γ-Radiolysis of cyclohexane with electron scavengers. III. Perfluorocarbons as electron scavengers

Sagert¹

1968

Can. J. Chem.

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The room temperature, liquid phase radiolysis of cyclohexane in the presence of three solutes: perfluorocyclohexane (PCH), perfluoromethylcyclohexane (PMCH), and perfiuorocyclobutane (PCB) has been examined. All decrease the hydrogen yield from 5.6 to 2.6 G units by capturing electrons. However, with PMCH and PCB the yields of cyclohexene and bicyclohexyl are not decreased as much as the hydrogen yield and with PCH, dimer and olefin yields are increased. Furthermore, large yields of monohydrofluorocarbon (e.g. undecafluorocyclohexane) are produced, indicating that a carbon-fluorine bond has been broken. It is concluded that electron capture by these fluorocarbon compounds causes dissociation; possible mechanisms are discussed, but it was not possible to reach a clear conclusion on the basis of our results.The radiolysis of homogeneous solid solutions of these solutes at 77 "K has also been studied, but only PMCH was studied in detail. Under these conditions there is no evidence for dissociative electron capture and apparently the combination of solute anion and hydrocarbon cation on warming does not lead to bond breaking.

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γ-Radiolysis of cyclohexane with electron scavengers. III. Perfluorocarbons as electron scavengers

Sagert¹

1968

Can. J. Chem.

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“…This phenomenon has been studied extensively in the gas phase since the initial experiments of Lind and Bardwell (I). Studies in the condensed phase have been more limited (2)(3)(4). The enhanced yields have been attributed mainly to charge transfer from the noble gas t o the hydrocarbon in the solid and liquid phases and to charge transfer accompanied by energy transfer in the gas phase.…”

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confidence: 99%

Radiolysis of cyclohexane in a xenon matrix at 77 °K

Stone¹

1968

Can. J. Chem.

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Low concentrations (less than 7 mole %) of cyclohexane and cyclohexane-dl have been irradiated in xenon matrices at 77 OK. The products are qualitatively the same as those obtained by the radiolysis of the pure hydrocarbon but the yields differ. In particular G(Hz) = 6.7 for 6.2 mole % cyclohexane is much higher than that for solid cyclohexane at the same temperature (4.65). (All G values are calculated on energy absorbed in the whole sample.) The G values for products are reduced to limiting values, which are -50-75 % of the initial ones, by low concentrations of SF,. Carbon tetrachloride reduces the yields to a greater extent than does SF,. Both ionic and nonionic product formation probably occur. Ion chamber dosimetry has been used to determine the energy absorption by xenon which is anomalous due to the presence of low energy, scattered gammas in the cobalt-60 source.

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A Radical Post‐Scavenging Study of Irradiated Cyclic Hydrocarbons in the Solid State

Tilquin

Allaert

Claes

1977

Bulletin des Soc Chimique

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Cycloalkanes were irradiated in the solid phase at 77 K. Post‐irradiation scavenging of radicals by dissolving the irradiated cycloalkane at low temperature (100 ‐ 165 K) in a propane‐oxygen mixture lowers the dicycloalkyl and cycloalkene G values to an extent of 35‐55%. From the Δ G decrease values, we propose that the trapped radical G values be 3.1, 2.7 and 2.7 at 77 K for cyclopentyl, cyclohexyl and cycloheptyl radicals, respectively.

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Charge Transfer in the Radiolysis of Dilute Solutions of Hydrocarbons in Krypton Matrices at 77 °k

Abstract: A B S T R A C T T h e radiolysis o f dilute solutions

Cited by 12 publications

References 22 publications

γ-Radiolysis of cyclohexane with electron scavengers. III. Perfluorocarbons as electron scavengers

γ-Radiolysis of cyclohexane with electron scavengers. III. Perfluorocarbons as electron scavengers

Radiolysis of cyclohexane in a xenon matrix at 77 °K

A Radical Post‐Scavenging Study of Irradiated Cyclic Hydrocarbons in the Solid State

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