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EPR parameters of radical ions and polarizability effect

✍ Scribed by Alexey N. Egorochkin; Olga V. Kuznetsova; Nadiya M. Khamaletdinova; Lada G. Domratcheva-Lvova

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
178 KB
Volume
49
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The literature data on substituent influence on the g factors, hyperfine coupling (hfc) constants (a) of the EPR signals and the spin densities (ρ) have been analyzed for 25 series of the organic radical cations and radical anions as well as of the transition metal complexes. The g, a, and ρ values were first established to depend not only on the inductive and resonance effects but also on the polarizability of substituents which can be characterized by the Οƒ~Ξ±~ constants. The polarizability effect is caused by the partial charge on the radical center. This effect consists in an electrostatic attraction between the charge and the dipole moments induced by this charge in the substituents. The polarizability contribution ranges up to 92%. Copyright Β© 2011 John Wiley & Sons, Ltd.

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