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Polarization of singlet-singlet electronic transitions in substituted naphtahlenes

✍ Scribed by Suzanne M. Lyle; E.C. Lim

Publisher
Elsevier Science
Year
1972
Tongue
English
Weight
262 KB
Volume
17
Category
Article
ISSN
0009-2614

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✦ Synopsis

The polarizationsof three low energy singlet-singlet electronic transitions of several monesubstituted naphthdenes have been measured rctative to the transition moment of fluorescence by the method of photoselection. It is shown that substitution of a hydrosy or a methosy group at the 2 (or &position of naphthalene leads to mixing between the 'Lb 2nd 'La states, resulting in the short-axis polarization of the electronic transition to the former state. 1 (or a> substituted compounds exhibit no such mixin g. and the transition to the rLb state is polarized Iargely along the long .-is of the molecuie. Substitution of a cyono group at the 2-position also leads to short-axis polarization of the Lb band. These results are consistent with the predictions based on molecular orbital calculations.

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