Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Radicals Produced by UV Irradiation of Acridan and Acridine in Glassy and Crystalline Medium at 77°K
Shigeya NiizumaMasao Koizumi
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1968 Volume 41 Issue 5 Pages 1090-1096


Choosing two groups of solvent a) methanol, ethanol, isopropanol (glassy at liquid nitrogen temperature) and b) t-butanol, benzene, tetrahydrofuran (crystalline at liquid nitrogen temperature), ESR studies have been made on the irradiated solutions of A] acridine (A)+acridan (AH2) (1:1), B] A alone, and C] AH2 alone at 77°K. 1) 365 mμ irradiation of A] and B] in the solvents of a) group does not cause any photochemical reaction, whereas in the solvents of b) group, the A*+AH2→2AH· reaction occurs. A resultant singlet ESR line has been assigned to AH·. 2) Irradiation of A] and C] with the entire output from a superhigh pressure mercury lamp gives, for solvents of group a), the ESR spectra which can be attributed mainly to alcohol radicals (RCHOH) but gives electronic absorption spectra ascribed only to AH· ; for the solvents of group b) the results were almost the same as in 1).

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