Kızılırmak Yatağından Çıkarılan Doğal Silis Mineralinin EPR Spektroskopisi ile İncelenmesi

Abstract

Kızılırmak yatağından alınan çakıl içinde bulunan ve yapısında organik radikaller bulunduran bir silis minerali EPR spektroskopisi ile incelenmiştir. Farklı sıcaklıklarda ve farklı mikrodalga gücü altında incelenen silis minerali içerisindeki radikallerin türü, EPR çizgilerinin şiddet dağılımlarına bakılarak belirlenmiştir. EPR spektrumlarında şiddet dağılımları birbirinden farklı olan sinyaller tespit edilmiş ve bu sinyallere ait g ve A spin-Hamiltonien parametreleri hesaplanmış ve Tablo 1ʹde verilmiştir. Literatür ile karşılaştırılarak, sinyaller camsı yapı içerisindeki 𝐶̇𝐻2, 𝐶̇𝐻3 , 𝐶̇𝐻 , 𝐶𝑂2−, 𝑂3− radikallerine atfedilmiştir.

Keywords

• EPR
• Radikal
• Camsı yapı

INVESTIGATION OF NATURAL SILICA MINERALS FROM THE KIZILIRMAK WITH EPR SPECTROSCOPY

Abstract

A silica mineral contained in gravel taking from the Kizilirmak deposit and bearing organic radicals in its structure was investigated by EPR spectroscopy. The type of radicals in the silica mineral determined under different temperatures and different microwave power were by examining the intensity distributions of the EPR lines. In EPR spectra, the signals with different intensity distributions were detected. g and A spin-Hamiltonian parameters for these signals were calculated and given in Table 1. These signals are attributed to the 𝐶̇𝐻2, 𝐶̇𝐻3 , 𝐶̇𝐻 , C𝑂2−, 𝑂3−radicals in the glassy structure by comparing with the literature.

Keywords

• EPR
• radicals
• glass structure

References

1. [1]D.G. Permenov and V.A. Radzig, Mechanism of Heterogenous Processes in the System SiO2+CH4,Kinetics and Catalysis, 45 (2004) 293-298.
2. [2]Sheriff, R.E., Encyclopedic Dictionary of Applied Geophysics, 4th Edition, Geophysical References,Society of Exploration Geophysicists, Vol.13,2002.
3. [3]Freeman A.J., Frankel R.B. (eds.): Hyperfine Interactions. New York: Academic Press 1967.
4. [4]Penrose R.P., Nature 163,992 (1949)
5. [5]Abragam A., Bleaney B.B.: Electron Paramagnetic Resonance of Transition Ions. Oxford:Clarendon Press 1970.
6. [6]J.E. Wertz, J.R. Bolton, J.A. Weil, Electron Paramagnetic Resonance Elementary Theory andPractical Application, John-Wiley and Sons INC, 568 s, USA, 1993.
7. [7]Mabbs F.E., Collison D.: Electron Paramagnetic Resonance of d Transition Metal Compounds.Amsterdam: Elsevier 1992.
8. [8]Pilbrow J.R., Transition Ion Electron Paramagnetic Resonance. Oxford: Clarendon Press 1990.

9. [9]Chien J.C.W., Dickinson L.C.: Biol. Magn. Reson. 3, 155 (1981)
10. [10]Hutchison C.A., Appl. Magn. Reson. 3, 219 (1992)
11. [11]Schweiger A., Concepts for the Measurement of Hyperfine Structure in EPR Spectroscopy, Appl.Magn. Reson. 1993, 5, 229.
12. [12]J. Kamali and G.N. Walton, Electron Spin Resonance of Gamma, Electron, Neutron and FissionFragments Irradiated K2SO4, Radiated Effects, 84 (1985), 171-184.
13. [13] R. Köseoğlu, E. Köseoğlu, F. Köksal, E. Başaran, D. Demirci, EPR of Some Irradiated Renal Stones, Radiation Measurements, 40 (2005) 65-68.
14. [14] F. Callens, P. Matthys, E. Boesman, Paramagnetic Resonance Spectrum of CO Trapped in KCl, J. Phy. Chem. Of Solids, 50 (1989) 377-381.
15. [15] N.M. Atherton, Electron Spin Resonance Theory and Application, John-Wiley and Sons INC, 438 s, USA, 1973.
16. [16] S. Çakır, F. Köksal, R. Tapramaz, O. Çakır, Electron Spin Resonance of Free Radicals in Some Legumes, Cereals and Their Aqueous Solutions Under Photolysis. Radiat. Phys. Chem.,38 (1991), 17-21.
17. [17] G. Bacquet, V. Quang-Truong, M. Vignoles, J.C. Tromble, G. Bonel, ESR of CO in X-irradiated tooth enamel and A-type carbonate apatite, Calcif. Tissue Int., 33(1981) 105.
18. [18] P.W. Atkins and M.C.R. Symons, The Structure of Inorganic Radicals, Elsevier Publishing Company, 1957.
19. [19] K. Tabaka, J. Jezierska, Molecular Geometry and Hyperfine Interactions in Iminoxy Radicals with C=O or CH2 Group – DFT and EPR Studies in Liquid and Rigid Media, Chemical Physics Letters, 394 (2004) 298–306.
20. [20] K. Tabaka, J. Jezierska, Positional and Angular Dependence of Hyperfine Interactions in Cyclic and Bicyclic Iminoxy Radicals with C=O or CH2 Group – DFT and EPR Studies, Chemical Physics Letters, 410 (2005) 391–399.
21. [21] F. Köksal, M. Birey, R. Tapramaz, F. Çelik, Journal of Molecular Structure, 211 (1990) 57.
22. [22] M. Chiesa, E. Giamello, and M. Che, EPR Characterization and Reactivity of Surface-Localized Inorganic Radicals and Radical Ions, Chem. Rev., 110 (2010) 1320–1347.