An Electron Spin Resonance Study of Gamma-Irradiated 5,6-Dihydropyrimidines
作者:
D.S. Holmes,
L.H. Piette,
期刊:
Spectroscopy Letters
(Taylor Available online 1968)
卷期:
Volume 1,
issue 7
页码: 281-291
ISSN:0038-7010
年代: 1968
DOI:10.1080/00387016808049980
出版商: Taylor & Francis Group
关键词: dihydropyrimidines;irradiation;electron spin resonance
数据来源: Taylor
摘要:
Electron spin resonance (ESR) spectra are observed from gamma-irradiated, poly-crystalline samples of 5,6-dihydrouracil, 5,6-dihydro-5-methyluracil, and 5,6-dihydro-6-methyluracll. The spectra indicate that the radiation-induced free radicals are formed by the loss of hydrogen atoms from the parent compounds. The crystal structure of the dihydropyrimidines is apparently such that there is a proton near the unpaired electron which can simultaneously flip with the flip of the unpaired electron resulting in the formation of satellite lines relative to the main spectral lines. Annealing the irradiated samples at 100°C produces a decrease in the radical content of all compounds except in dihydro-5-methyluracll where the radical content increases. These differences are discussed in terms of the close proximity of the radicals formed during irradiation of dihydro-5-methyluracil. The
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