Initial mode of radical pair formation in n-hydrocarbons irradiated at 1.5 and 4.2 K |
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Authors: | Machio Iwasaki Kazumi Toriyama Hachizo Muto Keichi Nunome |
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Institution: | Government Industrial Research Institute, Negoya, Hirate, Kita, Nagoya, Japan |
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Abstract: | The ESR spectra of X-irradiated (at 1.5 and 4.2 K) single crystals of n-decane-d22, n-decane-h22 and their mixtures have been measured at 1.5 and 4.2 K. It is concluded that almost all alkyl radicals are inherently formed in pairs in a fairly random fashion and that the spacial distribution of the radicals depends on the irradiation temperatures. In the crystal of n-decane-d22, a 1,3-carbon intrachain radical pair is identified together with a number of very close interchain pairs which are formed between almost all kinds of the first neighboring chains. The crystal of n-decane-h22 gives considerably larger spacial distribution of radicals, indicating a remarkable mass effect on the radical pair formation. |
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