Abstract
Methods of EPR spectroscopy and GLC were used to determine the magnetic resonance and thermodynamic characters of the formation of paramagnetic complexes consisting of a free π radical (diphenyldicumynitroxyl, triphenylverdazyl, indophenoxyl) and substituted benzenes. It was established that in such systems, depending on the donor-acceptor and polar properties of the diamagnetic molecules, there form paramagnetic complexes of two types: donor-acceptor complexes in which the free radical acts as a β-electron acceptor and both intramolecular and intermolecular redistribution of spin density is accomplished, and dipole-dipole complex in which electrostatic interaction determines mutual orientation of molecules in the complex and intramolecular distribution of electron and spin densities. Spectral and thermodynamic criteria of the formation of donor-acceptor and dipole-dipole paramagnetic free radical-diamagnetic molecule complexes are formulated.
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Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 25, No. 3, pp. 283–289, May–June, 1989.
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Kuts, V.S., Radchenko, N.F. & Filonenko, G.V. Relationship of magnetic resonance, thermodynamic, and structural characteristics of π complexes of free radicals with aromatic molecules. Theor Exp Chem 25, 260–265 (1989). https://doi.org/10.1007/BF01299001
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DOI: https://doi.org/10.1007/BF01299001