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    Electron spin resonance study of free radicals induced in single crystal of oxcarbazepine
    (Springer, 2023) Osmanoǧlu, Yunus Emre; Sütçü, Kerem
    In the present work, the ESR definition of gamma irradiated oxcarbazepine (OCB) single crystals and the ESR properties of the radicals formed after irradiation were studied at room temperature. Structural defects caused by irradiation in single crystals of OCB have been attributed to the R 1 (Ċ1 = CC = C(C = C1)C2(C(= O)NC(= O)N2)C3 = CC = CC = C3) radical as a result of experimental and simulation methods. The determination of the g value and hyperfine splitting constants of the R 1 radical was deduced from the most accurate simulations. ESR resonance signals persisted in the recorded experimental spectra for a duration of 45 days.
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    Gamma irradiated of amino acid derivatives examined by epr and simulation methods
    (TUBITAK, 2020) İpek Işıkcı, Nazenin; Osmanoǧlu, Yunus Emre
    Amino acids of solid state DL-beta-amino-n-butyric acid (BABA), Triethylene tetramine hexa acetic acid (TTHAA) and DL-Asparagine monohydrate (DLAMH) have been investigated by Electron Paramagnetic Resonance Spectroscopy. Free radicals formed in irradiated powder crystals have been examined at temperatures of 300 Kelvin. The structure of the free radical and the hyperfine structure constants were reported. The free radicals formed in the compounds were found to be stable for three months, fifteen days and two months respectively. The obtained results are in agreement with the literature values.
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    Identification of free radicals formed in gamma-irradiated acetazolamide using electron paramagnetic resonance spectroscopy
    (Springer, 2023) Sütçü, Kerem; Osmanoǧlu, Yunus Emre
    In this study, spectroscopic, dosimetric and stability characteristics of free radicals formed in acetazolamide (ACE) sample as a result of gamma irradiation in the range of 0–15 kGy were determined using electron paramagnetic resonance (EPR) spectroscopy. For this purpose, by interpreting the spectra of the sample in the 0–100 mW microwave power region, it was determined that two different radicals were formed in the sample. The structures formed after irradiation were attributed to CH3OṄ-(radical I) and -OSOṄH (radical II) radicals. The g-values, hyperfine coupling constants and spectrum contribution ratios of these radicals contributing to the experimental spectrum were also calculated. It has been determined that radical II is quite stable both at high temperature and after a long storage period.
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    Simulation study of paramagnetic centers induced in glycine tertbutyl ester hydrochloride and L-?-alanine ethyl ester in solid state
    (TUBİTAK, 2020) Osmanoǧlu, Yunus Emre
    The paramagnetic centers formed in glycine tert-butyl ester hydrochloride and L-α-alanine ethyl ester after irradiated was determined using EPR spectroscopy. The EPR spectra of the samples were attributed to the H2NĊHCO2C(CH3)3.HCl and CH3ĊHCOCH2CH3 radicals, respectively. The magnetic parameters obtained from the spectra were evaluated. The spectra were seen to be stable for more than 2 months at 300 K. Magnetic parameters and the electronic structure of the paramagnetic centers (radicals) were determined with a simulation method.