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.

2.50
Hdl Handle:
http://hdl.handle.net/10541/109800
Title:
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.
Authors:
Bruce, J M; Dodd, Nicholas J F; Gorman, A A; Hamblett, I; Kerr, C W; Lambert, C; McNeeney, S P
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.
Affiliation:
Chemistry Department, University of Manchester, UK.
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
Issue Date:
Aug-1990
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
Appears in Collections:
All Paterson Institute for Cancer Research

Full metadata record

DC FieldValue Language
dc.contributor.authorBruce, J Men
dc.contributor.authorDodd, Nicholas J Fen
dc.contributor.authorGorman, A Aen
dc.contributor.authorHamblett, Ien
dc.contributor.authorKerr, C Wen
dc.contributor.authorLambert, Cen
dc.contributor.authorMcNeeney, S Pen
dc.date.accessioned2010-08-18T08:43:30Z-
dc.date.available2010-08-18T08:43:30Z-
dc.date.issued1990-08-
dc.identifier.citationAnthralin-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.en
dc.identifier.issn0031-8655-
dc.identifier.pmid2217548-
dc.identifier.doi10.1111/j.1751-1097.1990.tb04190.x-
dc.identifier.urihttp://hdl.handle.net/10541/109800-
dc.description.abstractThe 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.en
dc.language.isoenen
dc.subject.meshAnthralin-
dc.subject.meshFree Radicals-
dc.subject.meshLasers-
dc.subject.meshMolecular Structure-
dc.subject.meshSpectrophotometry-
dc.titleAnthralin-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.en
dc.typeArticleen
dc.contributor.departmentChemistry Department, University of Manchester, UK.en
dc.identifier.journalPhotochemistry and Photobiologyen

Related articles on PubMed

All Items in Christie are protected by copyright, with all rights reserved, unless otherwise indicated.