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- W2511650654 abstract "Several of the free radicals formed by X-irradiation or y-irradiation of single crystals of a number of aliphatic dicarboxyl acids and amino acids have been analyzed in recent years. In most of these compounds the analyzed spectrum was found to be due to the breaking of a C-H bond with the resulting loss of the H atom (1-7). In a few cases a free radical due to the breaking of a C-C bond with the resulting loss of a carboxyl group was detected (8, 9). We have evidence in tartronic acid monohydrate of a free radical formed by the breaking of a C-C bond with the loss of a carboxyl group. The spin density is primarily localized on the carbon, with the odd electron in a 2pr orbital with coupling to the a-hydrogen and a weaker coupling to the hydroxyl hydrogen. METHOD Materials Single crystals of tartronic acid monohydrate, HOCH(COOH)2 H20, obtained from General Biochemicals, were grown from aqueous solution by slow evaporation. The deuterated powder was obtained by simple isotopic exchange in a solution of tartronic acid in 99.7 % D20, to give DOCH(COOD)2 D20. The D20 was vacuumevaporated at room temperature from the solution, the evaporation being completed in about 3 hours. Nuclear magnetic resonance spectra were recorded before and after deuteration to check the percentage of isotopic substitution. The total number of hydrogen atoms in the sample is proportional to" @default.
- W2511650654 created "2016-09-16" @default.
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- W2511650654 date "2016-01-01" @default.
- W2511650654 modified "2023-09-27" @default.
- W2511650654 title "Electron Spin Resonance of X-lrradiated Tartronic Acid1" @default.
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