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- W1967776583 abstract "Abstract Two different crystals of 5-methylcytosine with 5-methylthiocytosine as impuritiy, irradiated with ionising radiation, exhibit quite different types of paramagnetic centres associated with thio impurities. In 5-methylcytosine hemihydrate there are two types of radicals with the unpaired spin located mainly on sulphur. Both are of thiyl structure, presumably derived by a loss of an electron from 5-methylthiocytosine. In doped 5-methylcytosine hydrochloride two distinct paramagnetic species with high spin density on chlorine have been detected. One of them has been spectroscopically characterised and assigned to an electron-deficient species with the unpaired electron shared by a sulphur and a chlorine atom, with some delocalization over the pyrimidine ring. Both crystal lattices of 5-methylcytosine support migration of electrons/holes. In the hemihydrate lattice, the base stacking interaction, although weak in comparison to that in DNA or some other molecular crystals of the nucleic-acid bases, might be responsible for that. In the hydrochloride lattice, the chlorine-ion strings or layers might provide the means for the hole transport. Both neutral and positively charged 5-methylcytosine is a good radiation energy trap (hole trap)." @default.
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- W1967776583 date "1997-08-01" @default.
- W1967776583 modified "2023-09-26" @default.
- W1967776583 title "Radiation energy transfer and trapping in single crystals of hemihydrate and hydrochloride of 5-methylcytosine doped with 5-methylthiocytosine—An EPR study" @default.
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- W1967776583 doi "https://doi.org/10.1016/s0969-806x(97)00027-3" @default.
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