Intramolecular spin exchange in flexible short-chain biradicals in solutions with various viscosity
Article
Received:
Revised:
- 69 Downloads
- 15 Citations
Abstract
Intramolecular electron spin exchange as a function of temperature and solvent viscosity has been studied by X-band electron paramagnetic resonance (EPR) spectroscopy in two short-chain flexible nitroxide biradicals. Certain thermodynamic parameters of the conformational rearrangements were calculated from the EPR spectra. The process of spin exchange in these biradicals dissolved in six different alcohols is compared with that in a nonpolar solvent (toluene) and with the thermodynamic characteristics of the solvents. No correlation is found on a macroscopic level (solvent viscosity) but on a microscopic level (solvent longitudinal relaxation times) a distinct correlation is seen. The original results are compared with literature data.
Keywords
Electron Paramagnetic Resonance Electron Paramagnetic Resonance Spectrum Nitroxide Cyclohexanol Hexanol
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
References
- 1.Parmon V.N., Kokorin A.I., Zhidomirov G.M.: J. Struct. Chem.18, 104 (1977); Parmon V.N., Kokorin A.I., Zhidomirov G.M.: Stable Biradicals. Moscow: Nauka 1980.CrossRefGoogle Scholar
- 2.Rassat A.: Pure. Appl. Chem.25, 623 (1971)CrossRefGoogle Scholar
- 3.Shapiro A.B., Baimagambetov K., Goldfield M.G., Rozantsev E.G.: Zh. Org. Khim.8, 2263 (1972)Google Scholar
- 4.Parmon V.N., Kokorin A.I., Zhidomirov G.M., Zamaraev K.I.: Mol. Phys.30, 695 (1975)CrossRefADSGoogle Scholar
- 5.Molin Yu.N., Salikhov K.M., Zamaraev K.I.: Spin Exchange. Berlin: Springer 1980.Google Scholar
- 6.Grampp G., Landgraf S., Grigor’ev I.A., Shapiro A.B., Kokorin A.I.: Appl. Magn. Reson.19, 187 (2000)CrossRefGoogle Scholar
- 7.Alster E., Silver B.L.: Mol. Phys.58, 977 (1986)CrossRefADSGoogle Scholar
- 8.Shastnev P.V., Salikhov K.M.: Teor. Eksp. Khim.9, 291 (1973)Google Scholar
- 9.Nedlin G.M.: Fiz. Tverd. Tela (Leningrad)15, 3048 (1973)Google Scholar
- 10.Rozantsev E.G.: Free Nitroxyl Radicals. New York: Plenum 1970.Google Scholar
- 11.Shapiro A.B., Suskina V.I.: Izv. Akad. Nauk SSSR Ser. Khim.1986, 1900.Google Scholar
- 12.Shapiro A.B., Goldfield M.G., Rozantsev E.G.: Tetrahedron Lett.24, 2183 (1973)CrossRefGoogle Scholar
- 13.Riddick J.A., Bunger W.B., Sakano K.T. in: Techniques of Chemistry, vol. II: Organic Solvents. Physical Properties and Methods of Purification. New York: Wiley 1986.Google Scholar
- 14.Lemaire H.: J. Chem. Phys.64, 559 (1967)Google Scholar
- 15.Gulin V.I., Dikanov S.A., Martin V.V., Grigor’ev I.A., Volodarsky L.B.: Izv. Sib. Otd. Akad. Nauk SSSR Ser. Khim. (2)1988, 99.Google Scholar
- 16.Dikanov S.A., Shchukin G.I., Grigor’ev I.A., Rukin S.I., Volodarsky L.B.: Izv. Akad. Nauk SSSR Ser. Khim.1985, 565.Google Scholar
- 17.Gilmont R.: Measurement Control2002, 36.Google Scholar
- 18.Karapet’yants M.Kh., Yen K.-S.: Izv. Vyssh. Uchebn. Zaved., Khim. Khim. Tekhnol.4, 580 (1961)Google Scholar
- 19.Glarum S.H., Marshall J.H.: J. Chem. Phys.47, 1374 (1967)CrossRefADSGoogle Scholar
- 20.Luckhurst G.R.: Mol. Phys.10, 543 (1966)CrossRefADSGoogle Scholar
- 21.Parmon V.N., Kokorin A.I., Zamaraev K.I.: Izv. Akad. Nauk SSSR Ser. Khim.1976, 1776.Google Scholar
- 22.Friedman H.L.: J. Chem. Soc. Faraday Trans.79, 1465 (1983); Kivelson D., Friedman H.L.: J. Phys. Chem.93, 7026 (1989).CrossRefGoogle Scholar
- 23.Grampp G., Rasmussen K.: Phys Chem Chem Phys4, 5546 (2002)CrossRefGoogle Scholar
- 24.Onganer Y., Yin M., Bessire D.R., Quitevis E.L.: J. Phys. Chem.97, 2344 (1993)CrossRefGoogle Scholar
- 25.Hanna F.F., Gestblom B., Soliman A.: J. Mol. Liq.95, 27 (2002)CrossRefGoogle Scholar
- 26.Lou J., Hatton T.A., Laibnis P.E.: J. Phys. Chem. A101, 5262 (1997)CrossRefGoogle Scholar
Copyright information
© Springer 2004