Osmanoglu, Y. EmreSutcu, Kerem2024-04-242024-04-2420170022-28601872-8014https://doi.org/10.1016/j.molstruc.2017.05.086https://hdl.handle.net/11468/15860Gamma 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 HOOCCH2(C)over dotHCOOH, COOH(C)over dotHCHNH and HOCH2(C)over dotHCOOH radicals, respectively. The g values and the hyperfine coupling constants for the radical species are with values of g = 2.0038 +/- 0.0005, a(alpha) = 2.15 mT, a(beta)((1)) = 3.84 mT and a(beta)((2)) = 2.15 for the first radical, g = 2.0039 +/- 0.0005, a(alpha) = 1.7 mT, a(beta)((1)) = 0.62 mT, a(beta)((2)) = 0.54 mT, a(gamma) = 0.53 mT for the second radical and g = 2.0039 +/- 0.0005, a(beta)((1)) = 2.40 mT, a(beta)((2)) = 1.83 mT and a(alpha) = 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 2p(pi) orbital of the carbon atom. (C) 2017 Elsevier B.V. All rights reserved.eninfo:eu-repo/semantics/closedAccessEprFree RadicalsAmino Acid DerivativesGamma IrradiationArticle1145240243WOS:0004044917000272-s2.0-8501987384610.1016/j.molstruc.2017.05.086Q1Q3