Karboksili Asitlerin Elektron Paramanyetik Rezonans (EPR) Özellikleri

Yıl 2009, Sayı: 12, 197 - 201, 01.06.2009

M Halim Başkan

Öz

Bu çalışmada Karboksilli asitlerin Elektron Paramanyetik Rezonans (EPR) özellikleri incelemesi yapıldı. Karboksilli asit radikalleri ile ilgili olarak, bugüne kadar yapılan çalışmalar incelenerek ortak özellikler bulunmaya çalışıldı. Karboksilli asitlerin ışınlanması sonucu genellikle beş tip radikalin oluştuğu görüldü. Bu radikallerin aşırı inceyapı sabitleri ve g-değerleri hesaplanarak karşılaştırıldı. Bu tip radikallerden elde edilen spektrumların sıcaklığa bağlı olarak değişiklikler gösterdikleri anlaşıldı

Anahtar Kelimeler

EPR, karboksilli asitler, izobutirik asit türevleri, serbest radikaller

The Properties of Electron Paramagnetic Resonance (EPR) of Carboxyclic Acids

Öz

In this study, the properties of Electron Paramagnetic Resonance (EPR) of carboxylic acids were investigated by EPR technique. By investigating the studies about carboxylic acids from the begining till now, we tried to find common propertier. As a result of irradiating carboxylic acids, in general five types of rasicals were observed to occur. Hyperfine structure constants and g-values of these rasicals were calculated and compared. It was found that the spectra obtained from these rasicals showed differences based on temperature

Anahtar Kelimeler

EPR, carboxylic acids, isobutyric acid derivatives, free radicals

Kaynakça

• Aydın, M., Osmanoğlu Y. E. & Başkan, M.H. (2008). Electron paramagnetic resonance of γ- irradiated methyliminodiacetic acid. Radiat. Eff. Defect S., 163, 47-53. monohydrate, iminodiacetic acid and
• Başkan, M.H. & Osmanoğlu, Ş. (2004). EPR of Gamma Irradiated Nα-Monochloroacetyl-α- Aminoisobutyric Acid. Z.Naturforsch,. 59a, 665-668.
• Box, H.C. & Freund, H.G. (1966) Conformation of the Free Radical in Irradiated α- Aminoisobutyric Acid. J.Chem.Phys, 44, 2345-2348.
• Holmerg, R.W. (1969). ESR Study of HCO in Single Crystal of Formik Asit at 77 K. J.Chem .pys. 51, 3255-3260.
• Horsfield, A., Morton, J.R., & Whiffen, D.H. (1961) Electron Spin Resonance Spectra of the Free Radical (CH3)2ĊCOOH. Trans.Faraday Soc., 57, 1657-1661.
• Köksal, F.& Osmanoğlu, Ş. (1993) Electron Paramagnetic Resonance of Gamma-Irradiation Damage Centers in Ethylenediaminetetraacetic and Dietylenediaminepentaacetic Acids. Journal of Chemical Research. S, 84-85.
• McCalley, R.C. & Kwiram, A.L. (1970) Disvovery of A Sigma Radical in X-Irradiared Malonic Acid, J. Am. Chem. soc. 921, 441-1443.
• Nakajima, Y., Sato, S., & Shida, S. (1969) ESR Studies of Carboxylic Acid and Ester Radical Anions Produced by γ-Irradiated at 77 K. Bulletin Chem. Soc. Japan, 42, 2132-2136.
• Okay , G.& Özgün, B.(1986). Organik Kimya II, Ankara: Seldem Ofset ,sf.71-90.
• Osmanoğlu, Ş., Başkan, M.H. & Güner, T. (2002) EPR of Gamma Irradiated Single Crystal of 2,2-Dimethyl Succinic Acid. Z.Naturforsch. 57a, 909-911.
• Osmanoğlu, Ş. (2008) Electron Paramagnetic Resonance of Radiation Damage of γ-Irradiated diethylmalonic acid. J. Mol.Struct. 877, 7-9.
• Osmanoğlu, Ş., Köksal, F., Kartal, İ. & Ucun, F. (1997) Electron Paramagnetic Resonance of Gamma Irradiated Single Crystals of Two Isobutyric Acid Derivatives. Rad.Phys.Chem. 49, 419-420.
• Osmanoğlu, Ş. & Başkan, M.H. (2003) EPR of Gamma Irradiated Single Crystals of N-Acetyl and N-Carbamyl α-Aminoisobutyric Acid. Z.Naturforsch. 58a, 290-292.