Internal heavy atom studies on the triplet state of dimethyl- and dihaloxanthones

Henry J. Pownall, Itshak Granoth

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8 Scopus citations


The lowest triplet of these xanthones has been studied by phosphorescence spectroscopy. In 1:1 ether:ethanol, xanthone and its dimethyl derivatives have lowest triplets which contain considerable 3(π,π*) character with some 3(n,π*) character as assessed from phosphorescence lifetimes. The spectral positions and phosphorescence lifetimes are determined in part by both positional and inductive effects of the substituent. The phosphorescence of the dihaloxanthones exhibits additional spectral changes which can be attributed to an internal "heavy atom" effect which we attribute to a greater participation of the 3(π,π*) component of a "mixed" triplet state.

Original languageEnglish (US)
Pages (from-to)508-511
Number of pages4
JournalJournal of Physical Chemistry
Issue number5
StatePublished - Jan 1 1976

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry


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