Comparison of radiolysis of cyclopentane, 2,3-dimethylbutane,and neopentane at 4.2 K with that at 77 K as studied by analysis of dimer products |
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| Institution: | 1. Drug Radiation Research Department, National Center for Radiation Research and Technology (NCRRT), Atomic Energy Authority, Cairo, Egypt;2. Botany and Microbiology Department, Faculty of Science (Boys), Al-Azhar University, Cairo, Egypt;3. College of Biotechnology, Misr University for Science and Technology, Giza, Egypt;4. Chemical Engineering Department, Military Technical College, Egyptian Armed Forces, Cairo, Egypt;2. Centro de Investigação Interdisciplinar Egas Moniz, Instituto Universitário Egas Moniz, Caparica, Portugal;3. Centro Tecnológico das Indústrias Têxtil e do Vestuário de Portugal, Vila Nova de Famalicão, Portugal;4. Clinical Research Unit, Centro de Investigação Interdisciplinar Egas Moniz, Instituto Universitário Egas Moniz, Caparica, Portugal;5. Centro Hospitalar Universitário de Lisboa Central, Lisboa, Portugal;6. CERENA, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal;7. Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal |
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| Abstract: | The γ-radiolysis of cyclopentane, 2,3-dimethylbutane, and neopentane at 4.2 K was compared with that at 77 K by analysis of dimer products with capillary gas chromatography. In the radiolysis of cyclopentane, the yield of bicyclopentyl dimer at 4.2 K is lower than that at 77 K. The difference of the yields at two temperatures was explained in terms of disproportionation reaction of cyclopentyl radicals at very low temperature. In the radiolysis of 2,3-dimethylbutane, the distribution of dimer products at 4.2 K is different from that at 77 K. The results is due to the effect of phase change between two temperatures. In the radiolysis of 2,3-dimethylbutane, the fraction of unsaturated dimers in all dimer products at 77 K is much larger than that at 4.2 K. The olefinic dimer-products at 77 K is related to favorable formation of olefinic cations at 77 K. In the radiolysis of solid neopentane, addition of helium gas promotes the formation of 2,2,3,3-tetramethylbutane by a non-radical process. |
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