Abstract
The kinetics of sequential generation of mono-, bi-, and triradical centers in heterogeneous reactions of toluene solutions of orthoquinones, catechols, and their mixtures with γ-Al2O3 was studied. The localization of mono- and biradical centers on the solid oxide surface and the transfer of triradical Al3+ (Q−)3 complexes (Q− is the corresponding 3,6-di-tert-butylsemiquinone radical) to a solution (extraction of Al from the solid phase) were proved. The number of the triradical complexes extracted is considerably higher than that of active surface centers accessible for coordination with radical ligands. The conditions favoring the formation of the radical complexes on the Al ions were established. Possible mechanisms of these processes were proposed.
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Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2223–2227, November, 1998.
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Vorob'eva, G.A., Gal'tseva, E.V., Kozintsev, A.V. et al. Sequential coordination of orthosemiquinone radical ligands by surface centers on γ-Al2O3 . Russ Chem Bull 47, 2155–2159 (1998). https://doi.org/10.1007/BF02494271
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DOI: https://doi.org/10.1007/BF02494271