Radical products of gamma-radiolysis of 12-crown-4 at 77 Kстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Paramagnetic products of gamma-radiolysis of 12-crown-4 and its solutions in CFCl3 and CFCl2CF2Cl at 77 K were studied by ESR spectroscopy. It was found that the ESR spectra of 12-crown-4 irradiated with gamma-rays at 77 K contained superimposing signals of at least two species, the radicals resulting from macrocycle opening -CH-C(H)=O and macrocyclic radicals -O-CH-CH2-, which are formed with nearly equal yields. It was shown that -O-CH-CH2- radicals rapidly decayed at temperatures above 140 K. However, the -CH-CH=O radicals are stable almost up to the matrix softening temperature. The radical cations of 12-crown-4 are not stabilized in the matrices of Freon 11 and Freon 113, since they undergo transformation to macrocyclic radicals O-CH-CH2- via the deprotonation reaction.