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    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.

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    Authors
    Bruce, J M
    Dodd, Nicholas J F
    Gorman, A A
    Hamblett, I
    Kerr, C W
    Lambert, C
    McNeeney, S P
    Affiliation
    Chemistry Department, University of Manchester, UK.
    Issue Date
    1990-08
    
    Metadata
    Show full item record
    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 S1 is less than or equal to 30 ps, that of T1 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 (lambda 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.
    Citation
    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. 1990, 52 (2):345-51 Photochem. Photobiol.
    Journal
    Photochemistry and Photobiology
    URI
    http://hdl.handle.net/10541/109800
    DOI
    10.1111/j.1751-1097.1990.tb04190.x
    PubMed ID
    2217548
    Type
    Article
    Language
    en
    ISSN
    0031-8655
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1751-1097.1990.tb04190.x
    Scopus Count
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