Positive hole transfer between organic molecules of different classes in freon matricesстатья

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[1] Positive hole transfer between organic molecules of different classes in freon matrices / A. V. Egorov, I. A. Baranova, A. A. Zezin et al. // High Energy Chemistry. — 2007. — Vol. 41, no. 6. — P. 409–414. The processes of positive charge (hole) transfer between organic molecules of different classes occurring upon irradiation of their frozen freonic solutions at 77 K were studied by ESR spectroscopy. The efficiency of positive hole transfer was characterized by the ” redistribution coefficient ”, which was determined as ratio of concentrations of the radical cations of different compounds at equal concentrations of the parent neutral molecules. A very effective positive hole transfer to toluene was shown to occur for alkane-toluene pairs (K > 10). Meanwhile, much lower K values (similar to 2 to 3) were observed for alkane-alkene pairs, in spite of a rather high difference in the ionization potentials (ca. 1 eV). This effect was explained by the conformation dispersion and distribution of environment configurations of ionized molecules for the alkane-alkene pairs. An effective positive hole transfer (K similar to 6) was observed for the pair dimethyl ether-acetone, where the conformation dispersion was absent, although the difference in ionization potentials for this pair was only 0.3 eV. [ DOI ]

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