Radiolysis of Chloroform and Carbon Tetrachloride

Chen, T. H.; Wong, Kwok-Ming; Johnston, F. J.

doi:10.1021/j100837a013

Cited by 25 publications

(14 citation statements)

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“…Note that, in aerated dichloromethane solutions, the produced dichloromethyl and chloromethyl radicals are rapidly scavenged by molecular oxygen (O 2 ) producing the corresponding peroxyl radicals: CHCl 2 O 2 and CH 2 ClO 2 . 22,24 Nevertheless, even though the oxidizing power of peroxyl radicals is higher than that of neutral chloromethyl and dichloromethyl carbon centred radicals, 24 we chose to work under a nitrogen atmosphere in order to avoid any overoxidation of our materials in DCM. Emmi et al elucidated the oxidation of thiophene and oligothiophenes by means of pulse radiolysis in aerated and deaerated solutions of dichloromethane.…”

Section: Radiolysis Of Dichloromethane Solutions and Radio-synthesis mentioning

confidence: 99%

“…Contrarily to water, halo-methanes are very good solvents for many organic compounds 21 and their gamma radiolysis has been widely studied under different conditions. 22,23 Moreover, g-irradiation of halo-methane solvents yields several oxidizing species 21 which could enable first the oxidation of dissolved organic monomers and then their polymerization into CPs.…”

Section: Introductionmentioning

confidence: 99%

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An alternative radiolytic route for synthesizing conducting polymers in an organic solvent

et al. 2018

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Section: Radiolysis Of Dichloromethane Solutions and Radio-synthesis mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An alternative radiolytic route for synthesizing conducting polymers in an organic solvent

et al. 2018

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“…However, a more detailed study of a wide range of chloroform concentrations in toluene revealed that the reduction in H 2 yield is proportional to the molar fraction of the scavenging additive. The result indicates that the decrease in the amount of H 2 comes simply from a dilution effect since the radiolysis of chloroform itself is not known to produce H 2 …”

Section: Resultsmentioning

confidence: 99%

Role of the Low-Energy Excited States in the Radiolysis of Aromatic Liquids

2011

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The contribution of the low-energy excited states to the overall product formation in the radiolysis of simple aromatic liquids--benzene, pyridine, toluene, and aniline--has been examined by comparison of product yields obtained in UV-photolysis and in γ-radiolysis. In photolysis, these electronic excited states were selectively populated using UV-light excitation sources with various energies. Yields of molecular hydrogen and of "dimers" (biphenyl, bibenzyl, dipyridyl for benzene, toluene, pyridine, respectively, and of ammonia and diphenylamine for aniline) have been determined, since they are the most abundant radiolytic products. Negligibly small production of molecular hydrogen in the UV-photolysis of aromatic liquids with excitation to energies of 4.88, 5.41, 5.79, and 6.70 eV and the lack of a scavenger effect suggest that this product originates from short-lived high-energy singlet states. A significant reduction in "dimer" radiation-chemical yields in the presence of scavengers such as anthracene or naphthalene indicates that the triplet excited states are important precursors to these products. The results for toluene and aniline suggest that efficient dissociation from the lowest-energy excited triplet state leads to noticeable "dimer" production. For benzene and pyridine, the lowest-energy triplet excited states are not likely to fragment into radicals because of the relatively large energy gap between the excited state level and corresponding bond dissociation energy. The "dimer" formation in the radiolysis of benzene and pyridine is likely to involve short-lived high-energy triplet states.

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“…Some of the halogenated hydrocarbons that may be present in TRU wastes are chloroform, methylene chloride, 1,l , 1-trichloroethane, and 1,1,2-trichloro-l,2,2,-trifluoroethane (Freon-1 13). Measured values of G(HC1) of -5 to 11 have been reported (Ottolenghi and Stein 1961;Chen et al 1960) for pure chloroform at room temperature.…”

Section: D43 Miscellaneous Haiogenated Hydrocarbonsmentioning

confidence: 92%