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Further results on the triplet—triplet fluorescence of anthracenes

✍ Scribed by Gregory D. Gillispie; E.C. Lim

Publisher: Elsevier Science
Year: 1979
Tongue: English
Weight: 457 KB
Volume: 63
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(79)87035-9

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✦ Synopsis

Triplet-triplet

fhrorescence spectra have been measured following excitation into the St state for eight anthraccnes For those molecules in which near-infrared 3Bau -3B,o absorption has been reported, the @-0 band wavelength in absorption and fluorescence agrees well. Hoaever. the quantur?i yield of triplet-triplet emission in anthracene is more than a hundred times weaker than that predicted from independent measurements of Ta -Tt radiative and non-radiative decay rates. In general. halo-anthracenes exhibit considerably stronger triplet-triplet fluorescence than do the phenyl and methyl derivatives; the origin of this apparent interval heavy atom effect is unclear. The suggestion is made that more than one higher tripIet state is intimateIy involved in the St -T intersystem crossing of anthracenes.

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