Abstract
The recombination kinetics of three photogenerated covalently-linked ketyl-phenoxyl triplet radical pairs,3[PhC.(OD)C6H4O(CH2) n OC6H4C6H4O.] (n=3, 6, and 10), and of the corresponding deuterated derivatives were examined by the laser flash technique under an external magnetic field (up to 0.2 T) in a CDCl3/CD3OD (2∶1) mixture. In zero magnetic field, radical pairs (RPs) with small exchange interactions (n=6 and 10) are characterized by high values of the magnetic isotope effect (MIE), which reach 3 for pairs withn=10. Under strong magnetic fields (up to 0.2 T), the values of MIE decrease to 1.2 to 1.1. The photochemical behavior of covalently-linked RPs is compared with that of similar unlinked RPs in micelles.
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C. Doubleday Jr., N. J. Turro, and J.-F. Wang,Accounts. Chem. Res., 1989,22, 199; U. E. Steiner and H.-J. Wolff, in:Photochemistry and Photophysics,4, Eds. J. F. Rabek and G. W. Scott, CRC Press, Boca Raton, 1991, p. 1.
G. L. Closs, M. D. E. Forbes, and P. Piotrowiak,J. Am. Chem. Soc., 1992,114, 3285.
H. Staerk, H.-G. Busmann, W. Kuhnle, and R. Treichel,J. Phys. Chem., 1991,95, 1906.
Y. Tanimoto, N. Samejima, T. Tamura, M. Hayashi, A. Kita, and M. Itoh,Chem. Phys. Lett., 1992,188, 446; Y. Tanimoto, Y. Fujiwara, S. Takamatsu, A. Kita, M. Itoh, and M. Okazaki,J. Phys. Chem., 1992,96, 9844.
H. Nakamura, S. Usui, Y. Matsuda, T. Matsuo, K. Maeda, and T. Azumi,J. Phys. Chem., 1993,97, 534.
V. Ya. Shafirovich, E. E. Batova, and P. P. Levin,J. Chem. Soc. Faraday Trans., 1992,88, 935;J. Phys. Chem., 1993,97, 4877.
J.-F. Wang, V. P. Rao, C. Doubleday, Jr., and N. J. Turro,J. Phys. Chem., 1990,94, 1144.
N. J. Turro, K. C. Hwang, V. P. Rao, and C. Doubleday, Jr.,J. Phys. Chem., 1991,95, 1872.
P. P. Levin and V.A. Kuzmin,Chem. Phys. Lett., 1990, 165, 302;Chem. Phys., 1992,162, 79.
P. P. Levin, V. Ya. Shafirovich, and V. A. Kuzmin,J. Phys. Chem., 1992,96, 1044.
H. Miyasaka, M. Kiri, K. Morita, N. Mataga, and Y. Tanimoto,Chem. Phys. Lett., 1992,199, 21.
O. B. Lantratova, A. I. Prokofev, I. V. Khudyakov, V. A. Kuzmin, and I. E. Pokrovskaya,Nouv. J. Chim., 19826, 365.
Y. Tanimoto, N. Okada, S. Takamatsu, and M. Itoh,Bull. Chem. Soc. Jpn., 1990,63, 1342; K. Maeda, Q.-X. Meng, T. Aizawa, M. Terazima, T. Azumi, and Y.Tanimoto,J. Phys. Chem., 1992,96, 4884.
K. Schulten and P. G. Wolynes,J. Chem. Phys., 1978,68, 3292.
V. F. Tarasov, N. D. Ghatlia, N. I. Avdievich, I. A. Shkrob, A. L. Buchachenko, and N. J. Turro,J. Am. Chem. Soc., 1994,116, 2281.
A. Weller, H. Staerk, and R. Treichel,Faraday Disc. Chem. Soc., 1984,78, 271.
H. Hayashi and S. Nagakura,Bull. Chem. Soc. Jpn., 1984,57, 322.
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Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 442–446, March, 1995.
The authors are grateful to V. F. Tarasov, A. I. Shushin (N. N. Semenov Institute of Chemical Physics, RAS) and V. A. Nadtochenko (Institute of Chemical Physics in Chernogolovka, RAS) for helpful discussions.
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Batova, E.E., Levin, P.P., Shafirovich, V.Y. et al. Magnetic field and magnetic isotope effects on the recombination kinetics of covalently-linked ketyl-phenoxyl triplet radical pairs. Russ Chem Bull 44, 427–431 (1995). https://doi.org/10.1007/BF00702380
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DOI: https://doi.org/10.1007/BF00702380