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Mechanism of photocycloaddition in α,ω-(bis-9-anthryl)-n-alkanes

✍ Scribed by James Ferguson

Book ID
103020299
Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
386 KB
Volume
76
Category
Article
ISSN
0009-2614

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✦ Synopsis

Receked 17 June 1980 hleasurements of quantum yields of fluorescence, photoreaction and internal deactivation as a function of temperature in a glass-forming solvent provide no support for a biradical intermediate in the reversible photochemistry of a,w_(bk+9anthryl)+alkanes. Photocycloaddition is therefore a concerted reaction. 1. introduction Kaupp [ I] pointed out the need for accurate measurements of quantum yields for the elucidation of photomechanism in reversible photochemical reac-tions_ From measurements with 2.2anthracenophane he concluded that a biradical mechanism was involved. Bergrnark et al. [2] studied bis(9-anthryl) methane and l&%(9-anthryl)ethane

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Comment on “mechanism of photocycloaddit
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Fluorescence and photocyclomerization quantum-yield measurements and a transient kinetic analysis were performed for a series of u,w-fbis-9-anthryl)-fi-~anes (4Ca-X to ACro-A and A-tiy-A) in methylcyclohesane and ethanol. Of note is an irregular periodicity of intramolecular escimer fluorescence yie