کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5160206 | 1501672 | 2017 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
EPR studies of the free radicals generated in gamma irradiated amino acid derivatives
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Gamma irradiated powder forms of N-acetyl-dl-aspartic acid, N-carbamoyl-dl-aspartic acid and N-methyl-l-serine were investigated by electron paramagnetic resonance spectroscopy (EPR) at room temperature. In these compounds, the paramagnetic centers formed after irradiation were attributed to the HOOCCH2ÄHCOOH, COOHÄHCHNH and HOCH2ÄHCOOH radicals, respectively. The g values and the hyperfine coupling constants for the radical species are with values of g = 2.0038 ± 0.0005, aα = 2.15 mT, aβ(1) = 3.84 mT and aβ(2) = 2.15 for the first radical, g = 2.0039 ± 0.0005, aα = 1.7 mT, aÃ(1) = 0.62 mT, aÃ(2) = 0.54 mT, aγ = 0.53 mT for the second radical and g = 2.0039 ± 0.0005, aβ(1) = 2.40 mT, aβ(2) = 1.83 mT and aα = 1.83 mT for the third radical. The free radicals formed in three compounds were found to be stable for three months at room temperature. It was concluded that, spin density was concentrated predominantly in the 2pÏ orbital of the carbon atom.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 1145, 5 October 2017, Pages 240-243
Journal: Journal of Molecular Structure - Volume 1145, 5 October 2017, Pages 240-243
نویسندگان
Y. Emre OsmanoÄlu, Kerem Sütçü,