Effect of irradiation on ethyl 2-amino-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate: an ESR study
Küçük Resim Yok
Tarih
2012
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
WILEY-BLACKWELL
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Ethyl 2-amino-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate [C11H15NO2S] was synthesized by the Gewald method. Its single crystals were grown from an alcohol/ethyl acetate solution at 15 degrees C and characterized using IR and 1H-NMR. These single crystals were irradiated for 72h at 298K by a 60Co gamma source with a dose speed of 0.864kGy/h. After irradiation, electron spin resonance (ESR) measurements were carried out to study radiation-induced radicals in the temperature range from 120 to 450K. Additionally, for the single crystal, ESR angular dependencies were measured in the xy, xz and yz planes of the substance. This irradiated single crystal was analyzed based on the ESR spectra. Analysis of the spectra revealed that the radical was formed by a CH bond fission at the carbon end of the substance. It was also observed that the color of the sample changed after irradiation. The hyperfine and g parameters were determined from the experimental spectra. It was inferred from these results that the hyperfine parameters and g value exhibited anisotropic behavior. The average values of these parameters were calculated as follows: g=2.0088, AH1=H2=20.70G, AH3=H4=10.80G, AHa=4.59G, AHb=3.24G and, AN=6.10G. Copyright (c) 2011 John Wiley & Sons, Ltd.
Açıklama
Anahtar Kelimeler
electron spin resonance, ethyl-amino-4, 5, 6, 7-tetrahydrobenzo[b]thiophene-3-carboxylate, Gewald method, irradiation effects, radical
Kaynak
JOURNAL OF PHYSICAL ORGANIC CHEMISTRY
WoS Q Değeri
Q3
Scopus Q Değeri
Q3
Cilt
25
Sayı
4
