Intramolecular Mobility in Nitroxide Biradicals with Flexible Linkers
Tóm tắt
Intramolecular electron spin exchange has been studied by X-band electron paramagnetic resonance (EPR) spectroscopy in two long-chain flexible nitroxide biradicals existing in fluid solutions in three spectroscopy-different spatial conformations as a function of temperature, solvent viscosity and polarity. Certain thermodynamic parameters of the conformational transitions were calculated from the EPR spectra. The process of spin-exchange in these biradicals dissolved in five different alcohols was compared with that in the non-polar solvents (toluene) and aprotic (acetonitrile), as well as with two other biradicals studied earlier, and with thermodynamic characteristics of the solvents. A distinct correlation was found between macroscopic (solvent viscosity) characteristics of solvents and thermodynamic parameters of the intramolecular conformational transitions.
Tài liệu tham khảo
A.L. Buchachenko, V.A. Golubev, A.A. Mejidov, E.G. Rozantsev, Theoret. Exp. Khim. 1, 249 (1965)
E.G. Rozantsev, V.I. Suskina, Izv. AN SSSR. Ser. Khim 9, 2148 (1968)
E.G. Rozantsev, Free Nitroxyl Radicals (Plenum Press, New York, 1970)
V.N. Parmon, A.I. Kokorin, G.M. Zhidomirov, K.I. Zamaraev, Mol. Phys. 30, 695 (1975)
V.N. Parmon, A.I. Kokorin, G.M. Zhidomirov, Russ. J. Struct. Chem. 18, 104 (1977)
S.V. Kozlov, A.I. Kokorin, A.B. Shapiro, E.G. Rozantsev, Vysokomolek. Soed. 23, 323 (1981)
S.A. Dikanov, G.I. Shchukin, I.A. Grigoŕev, S.I. Rukin, L.B. Volodarsky, Izv. AN SSSR. Ser. Khim. 3, 565 (1985)
I.A. Grigor’ev, S.A. Dikanov, Synthesis, properties, applications, in Imidazoline nitroxides, 1st edn., ed. by L.B. Volodarsky (CRC Press, Boca Raton, 1988), pp. 77–150
S. Sankarapandi, J.M. Rifkind, P.T. Manoharan, Proc. Indian Acad. Sci. Chem. Sci. 106, 1329 (1994)
S. Sankarapandi, M. Sukumar, P. Balaram, P.T. Manoharan, Biochem. Biophys. Res. Commun. 213, 439 (1995)
V.A. Tran, K. Rasmussen, G. Grampp, A.I. Kokorin, Appl. Magn. Reson. 32, 395 (2007)
G. Ionita, V. Meltzer, E. Pincu, V. Chechik, Org. Biomol. Chem. 5, 1910 (2007)
J. Szydłowska, K. Pietrasik, Ł. Głaz, A. Kaim, Chem. Phys. Lett. 460, 245 (2008)
A. Kaim, K. Pietrasik, T. Stokłosa, Eur. Polym. J. 46, 519 (2010)
A. Kaim, J. Szydłowska, K. Pietrasik, Macromol. Res. 19, 1041 (2011)
E.G. Ionita, G.A. Vorobieva, V. Chechik, A.I. Kokorin, Appl. Magn. Reson. 46, 251 (2015)
B. Mladenova-Kattnig, G. Grampp, A.I. Kokorin, Appl. Magn. Reson. 46, 1359 (2015)
S.S. Eaton, L.B. Woodcock, G.R. Eaton, Concepts Magn. Reson. A 47A, e21426 (2019)
A.I. Kokorin, Ionic Liquids, Theory and Applications (InTech Publ., Rijeka, 2011), pp. 183–200
D. Wang, Y. Ma, B. Wolf, A.I. Kokorin, M. Baumgarten, J. Phys. Chem. A 122, 574 (2018)
A.I. Kokorin, E.N. Golubeva, V.A. Tran, B. Mladenova, T. Kálai, K. Hideg, G. Grampp, Appl. Magn. Reson. 44, 1041 (2013)
O.I. Gromov, E.N. Golubeva, V.N. Khrustalev, T. Kálai, K. Hideg, A.I. Kokorin, Appl. Magn. Reson. 45, 981 (2014)
A.I. Kokorin, O.I. Gromov, T. Kálai, K. Hideg, Appl. Magn. Reson. 47(11), 1283–1293 (2016)
A.I. Kokorin, O.I. Gromov, P.V. Dorovatovskii, V.A. Lazarenko, V.N. Khrustalev, K. Hideg, T. Kálai, Appl. Magn. Reson. 50, 425 (2019)
C. Reichard, Chem. Rev. 94, 2319 (1994)
Y. Marcus, The Properties of Solvents (Wiley, Chichester, 1998)
G. Grampp, K. Rasmussen, Phys. Chem. Chem. Phys. 4, 5546 (2002)
A.B. Shapiro, V.I. Suskina, V.V. Fedorova, E.G. Rozantsev, Izv. AN SSSR. Ser. Khim. 4, 694 (1970)
J.A. Riddick, W.B. Bunger, K.T. Sakano, Organic Solvents, Physical Chemistry and Methods of Purification, in Techniques of chemistry, 2nd edn., ed. by K.T. Sakano (Wiley, New York, 1986)
Yu.N. Molin, K.M. Salikhov, K.I. Zamaraev, Spin Exchange (Springer, Berlin, 1980)
A.I. Kokorin, Appl. Magn. Reson. 26, 253 (2004)
R. Gilmont, Meas Control 10, 36 (2002)
M.K. Karapetýants, K.-S. Yen, Izv. Vysshikh Uchebn. Zavedenii Khim. i Khim. Tekhnol. 4, 580 (1961)
J. Barthel, R. Buchner, M. Münsterer, Chemistry Data Series. Part 2a: Electrolyte Data Collection, 12th edn. (Dechema, Germany, 1996)
S.P. Patil, A.S. Chaudhari, M.P. Lokhande, M.K. Lande, A.G. Shankarwar, S.N. Helambe, B.R. Arbad, S.C. Mehrotra, J. Chem. Eng. Data 44, 875–878 (1999)
S.K. Garg, C.P. Smyth, J. Chem. Phys. 46, 373–378 (1967)
M.L.T. Asaki, A. Redondo, T.A. Zawodzinski, J. Chem. Phys. 116, 10377–10385 (2002)
G. Grampp, K. Rasmussen, A.I. Kokorin, Appl. Magn. Reson. 26, 245 (2004)