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

Henry J. Pownall; Itshak Granoth

doi:10.1021/j100546a017

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

Henry J. Pownall, Itshak Granoth

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Abstract

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 language	English (US)
Pages (from-to)	508-511
Number of pages	4
Journal	Journal of Physical Chemistry
Volume	80
Issue number	5
DOIs	https://doi.org/10.1021/j100546a017
State	Published - Jan 1 1976

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General Engineering
Physical and Theoretical Chemistry

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abstract = "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.",

author = "Pownall, {Henry J.} and Itshak Granoth",

year = "1976",

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doi = "10.1021/j100546a017",

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T1 - Internal heavy atom studies on the triplet state of dimethyl- and dihaloxanthones

AU - Pownall, Henry J.

AU - Granoth, Itshak

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Y1 - 1976/1/1

N2 - 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.

AB - 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.

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

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