Electron paramagnetic resonance study of gamma ( gamma )-irradiated methyl 4-methyl benzoate (C sub(9)H sub(10)O sub(2))

• Published in: Radiation effects and defects in solids 2016-07, Vol.171 (7-8), p.651-657
• Main Authors: Karatas, Ozgul, Aras, Erdal, Karadag, AHalide, Islek, Yasemin
• Format: Article
• Language: English
• Subjects: Anisotropy; Benzoates; Electron paramagnetic resonance; Free radicals; Irradiation; Single crystals; Spectra
• ISSN: 1042-0150; 1029-4953
• DOI: 10.1080/10420150.2016.1240175

In this study, gamma ( gamma )-irradiated methyl 4-methyl benzoate (C sub(9)H sub(10)O sub(2)) single crystals were investigated and the structure of the free radical occurring by gamma -irradiation was determined by using Electron paramagnetic resonance (EPR) technique. C sub(9)H sub(10)O sub(2) single crystals were produced by slow evaporation with distilled water solution at room temperature. These single crystals were irradiated by super(60)Co-gamma-ray source with a dose speed of 0.981 kGy/h at room temperature for 72 h. The EPR spectra of irradiated C sub(9)H sub(10)O sub(2) single crystals were recorded between 125 and 400 K temperatures in steps of 10 degree intervals at different orientations in magnetic field with an X-band EPR spectrometer. The spectra were found to be slightly anisotropic and temperature independent; taking into consideration the chemical structure with experimental data we found only one free radical structure [Image omitted.]. The radical structure was simulated using the Bruker software WinEPR-Simfonia and the experimental g-value with anisotropic hyperfine coupling constants of radical were calculated as follows: g = 2.0124, [Image omitted.] = 26.51G, [Image omitted.] = 5.45G.