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Trends in Photochemistry & Photobiology   Volumes    Volume 3  Issue 1
Formation and decay of anthryloxy radicals produced via higher excited triplet nπ* states of nitroanthracenes (the 9-nitro, 9-benzoyl-10-nitro and 9-cyano-10-nitro compounds)
Kumao Hamanoue, Toshihiro Nakayama
Pages: 91 - 100
Number of pages: 10
Trends in Photochemistry & Photobiology
Volume 3  Issue 1

Copyright © 1994 Research Trends. All rights reserved

From measurements of phosphorescence and triplet-triplet absorption spectra due to the lowest excited triplet π π* states of the title compounds together with the absorption spectra of their anthryloxy radicals, it is concluded that photolysis of nitroanthracenes gives rise to the nitro→nitrite rearrangement for a higher excited triplet state of  nπ* character, followed by the cleavage of nitrites to anthryloxy radicals and nitrogen (II) oxide. Except for the formation of anthraquinone monoxime via 9-nitroanthracenes, the existence of a keto-enol equilibrium between anthrone and 9-anthronol, and the recombination of two 9-anthryloxy raicals yielding 10, 10’ -bianthrone, the photophysics and photochemistry of 9-nitroanthracene are essentially identical with those of 9-benzoyl-10-nitroanthracene and 9-cyano-10-nitroanthracene.
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