An EPR study on radiation-induced 4-hydroxyphenyl-acetic acid polycrystalline

Ceylan, Yusuf; Usta, K.; Usta, Ayhan; Aydoğmuş, Hacer Yumurtacı; Güner, Ali̇

doi:10.1016/j.molstruc.2015.07.022

Cited by 8 publications

(6 citation statements)

References 17 publications

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“…In recent years, electron paramagnetic resonance (EPR) technique has been widely used for characterization of various materials . Researchers have investigated compounds containing Ag and Br by using EPR method.…”

Section: Introductionsupporting

confidence: 87%

Identification of radical structures on 1-pentamethylbenzyl-3-ethylimidazoliumsilver(I)bromide and 1,3-bis(pentamethylbenzyl)-4,5-dimethylbenzimidazoliumsilver(I)bromide exposed to gamma rays: an EPR study

et al. 2016

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1-Pentamethylbenzyl-3-ethylimidazoliumsilver(I)bromide and 1,3-bis(pentamethylbenzyl)-4,5dimethylbenzimidazoliumsilver(I)bromide and their Ag complexes were synthesized and their polycrystal forms were produced by recrystallization in dichloromethane/Et O solvent system. Structural determinations were carried out by H NMR and C NMR with a Varian 400 NMR system using tetramethylsilane as internal standard and CDCl as solvent. The disappearance of acidic N-heterocyclic carbene proton showed the formation of Ag(I) complexes. Also, elemental analyses were carried out. Electron paramagnetic resonance (EPR) measurements were performed to determine the formed radical structure on the samples irradiated at the room temperature for 72 h by using Co-source with dose rate of 0.680 kGy. The EPR measurements were carried out in the temperature range of 200 K-450 K. Identical radicals were determined on the irradiated compounds. It was observed that the shapes of the spectra of the samples were independent of the temperature but, the resonance line intensities changed linearly with the temperature. Also, it was detected that the free radical on the 1-pentamethylbenzyl-3-ethylimidazoliumsilver(I)bromide is not stable compared to that on the 1,3-bis(pentamethylbenzyl)-4,5dimethylbenzimidazoliumsilver(I)bromide. Copyright © 2016 John Wiley& Sons, Ltd.

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Section: Introductionsupporting

confidence: 87%

Identification of radical structures on 1-pentamethylbenzyl-3-ethylimidazoliumsilver(I)bromide and 1,3-bis(pentamethylbenzyl)-4,5-dimethylbenzimidazoliumsilver(I)bromide exposed to gamma rays: an EPR study

et al. 2016

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“…At the implementation of the theoretical phase, studies were performed separately for COP2 and COP4. Unlike in our previous work [21], trainings were performed separately for the data sets and average statistical values were calculated. The basic steps of the theoretical study are as follows: firstly the current data was used for training for ten-fold cross validation in the Weka Explorer and it was tried to determine the methods having the least error values.…”

Section: Resultsmentioning

confidence: 99%

Analysis of Poly(2-Hydroxyethyl~Methacrylate)-co- Poly(4-Vinyl Pyridine) Copolymers [COP2,4] Irradiated: an EPR study

et al. 2016

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Poly(2-hydroxyethyl methacrylate)-co-poly(4-vinyl pyridine) and poly(HEMA)-co-poly-(4-VP) copolymers were synthesized by free radical polymerization. K2S2O8 was used as an initiator. Chain lengths of the copolymer was changed by varying the monomer/initiator ratio. These polymers have molarites of 2.6 and 2.1 respectively and are called COP2 and COP4. The samples were exposed to gamma rays at room temperature. After irradiation, the EPR spectra of COP2 and COP4 were recorded between 120 K and 450 K. From the temperature dependence of the line intensity, it was concluded that unpaired spin concentration in the irradiated samples has been changing with temperature. A theoretical study, presented in this report, was aimed to test success of the machine learning methods and to select the best learning method.

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“…Therefore, it is important to identify radical structures produced by irradiation. EPR is a powerful spectroscopic method for detecting radicals in the materials [7][8][9][10][11][12][13][14][15][16][17][18]. In this study, Calix [4]arene, labeled calix [4]arene (1), and 25,27-di(4-nitrobenzyl)-26,28-dihydroxycalix [4]arene, labeled calix [4]arene(2), were exposed to gamma rays and then radical structures of these calix [4]arenes were evaluated by EPR method.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Influences of Gamma Rays on Calix[4]Arene and 25,27-di(4-Nitrobenzyl)-26,28-Dihydroxycalix[4]Arene: EPR Study

et al. 2017

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In the present study, calix [4]arene and its derivate 25,27-di(4-nitrobenzyl)-26,28-dihydroxycalix[4]arene were irradiated for 72 hours by 60 Co gamma rays at dose rate of 0.720 kGy/h. These irradiated samples were analyzed by EPR method and it was found that one type of radical was produced in calix[4]arene, and two type of radicals were produced in 25,27-di(4-nitrobenzyl)-26,28-dihydroxycalix[4]arene. The measurements were performed in the temperature range of 273-400 K using x-band EPR spectrometer. It was observed that the spectra, obtained from two samples, have very weak temperature dependence. Hyperfine and g parameters were calculated for two samples.

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An EPR study on radiation-induced 4-hydroxyphenyl-acetic acid polycrystalline

Cited by 8 publications

References 17 publications

Identification of radical structures on 1-pentamethylbenzyl-3-ethylimidazoliumsilver(I)bromide and 1,3-bis(pentamethylbenzyl)-4,5-dimethylbenzimidazoliumsilver(I)bromide exposed to gamma rays: an EPR study

Identification of radical structures on 1-pentamethylbenzyl-3-ethylimidazoliumsilver(I)bromide and 1,3-bis(pentamethylbenzyl)-4,5-dimethylbenzimidazoliumsilver(I)bromide exposed to gamma rays: an EPR study

Analysis of Poly(2-Hydroxyethyl~Methacrylate)-co- Poly(4-Vinyl Pyridine) Copolymers [COP2,4] Irradiated: an EPR study

Comparative Study of Influences of Gamma Rays on Calix[4]Arene and 25,27-di(4-Nitrobenzyl)-26,28-Dihydroxycalix[4]Arene: EPR Study

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