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On the fluorescence anomaly of azulene

✍ Scribed by G. Binsch; E. Heilbronner; R. Jankow; D. Schmidt

Publisher
Elsevier Science
Year
1967
Tongue
English
Weight
287 KB
Volume
1
Category
Article
ISSN
0009-2614

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✦ Synopsis

Azulene (symmetry C2,) is the only known example of a compound in which the fluorescence transition originates from the second electronically excited singlet state (S2 -SO) rather than from the lowest one (Sl -SO). It is shown that single annelation. lowering of symmetry (from C2*, to C, or C2). increase of the energy gap ratio (ES, -Es, )/(Es, -Es,). inclusion of a n loose bolt" substituent or an increase in spinorbit coupling does not remove this-anomaly.

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Deuterium isotope effect on the fluorescence lifetime of azulene
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The quantum yield ratio r=& +&+ . , ofthe &-So and +S, fluorescences from azulene has been redetermined. With azulene in isopentane at 190 K, r=455 & 100. This value agrees with the lower limit, given by Huppert, Jortner and Rentzepis, but is an order of magnitude lower than that given by Gillispie