Journal of Physical Chemistry p. 6077 - 6079 (1987)
Update date:2022-08-11
Topics:
Spangler, Lee H.
Zee, Roger D. van
Blankespoor, Stephen C.
Zwier, Timothy S.
The geometry of the isolated trans-stilbene molecule has been investigated through the study of a close analogue, α-deuterio-trans-stilbene, in which the inversion symmetry is broken.Both the jet-cooled fluorescence excitation and dispersed fluorescence spectra show no observable intensity down to 0.02percent of the origin in the fundamentals of two low-frequency vibrational modes which should become allowed if the molecule were nonplanar.However, we do observe at least one new transition in the first 400 cm-1 which is present due to symmetry lowering as a result of the isotopic substitution.We conclude that both isolated α-deuterio-trans-stilbene and trans-stilbene itself are planar in both their ground and first excited singlet states.
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