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Discrimination between 3ππ* and 3nπ* states in organic molecules by circular polarization of phosphorescence

✍ Scribed by Peter M.L. Blok; Harry P.J.M. Dekkers

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
606 KB
Volume
161
Category
Article
ISSN
0009-2614

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✦ Synopsis

The degree of circular polarization gin electronic transitions of chiral molecules is a measure of the ratio of the magnetic and electric dipole transition moments. From theory an upper bound for lgl as a function of dipole strength D can be found. This offers the possibility to distinguish %x* from 'nn* states in organic molecules. For molecules of approximate Clv symmetry it can be shown that large absolute values of g,,, (order 10-l ) can arise only in the case of Jmr* phosphorescence, whereas emission from %m* states yields low values of g,,, (order lo-'), This conclusion is substantiated with experimental data on three examples: a-santonin, ( IS)-( -)-I-bromo-a-fenchocamphoronequinone and ( + )-thiocamphor.

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