ANTHRALIN‐DERIVED TRANSIENTS—II. FORMATION OF THE RADICAL BY SPONTANEOUS FRAGMENTATION OF BOTH SINGLET AND TRIPLET STATES OF THE 10,10′‐DEHYDRODIMER: RADICAL PAIR MULTIPLICITY EFFECTS
- 1 August 1990
- journal article
- research article
- Published by Wiley in Photochemistry and Photobiology
- Vol. 52 (2) , 345-351
- https://doi.org/10.1111/j.1751-1097.1990.tb04190.x
Abstract
The singlet and triplet states of the anthralin (1,8‐dihydroxy‐9‐anthrone) dehydrodimer have been produced selectively in benzene via pulsed laser excitation and pulse radiolysis respectively. The lifetime of S, is 30 ps, that of T, short but unspecified. Both states fragment spontaneously to yield a pair of anthralin radicals. The singlet radical pair predominantly undergoes geminate recombination within the solvent cage. In contrast, the corresponding triplet radical pair undergoes essentially exclusive cage escape to give the anthralin free radical (δ.max 370, 490 and 720 nm) which recombines under normal diffusive conditions. Both recombination processes lead, at least in part, to one or more species which have been assigned as tautomeric forms of the original dimer. The anthralin free radical in benzene is insensitive to the vitamin E model 6‐hydroxy‐2,2,5,7,8‐pentamethylchroman and reacts only slowly with oxygen.This publication has 23 references indexed in Scilit:
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