ELECTRONIC SPECTROSCOPY OF JET-COOLED CONJUGATED CYCLOHEXENE COMPOUNDS.

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1993

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Ohio State University

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The mass-resolved $S_{1} \leftarrow S_{0}$ resonant two-photon ionization spectrum of 1-phenylcyclohexene cooled in a supersonic jet has been observed. A weak origin transition was found at $35066 cm^{-1}$. upon which was built a long progression in a low frequency mode assigned to the torsional motion between the two rings. The spectrum was analyzed using a hindered rotor model to calculate the $S_{1}$ torsional potential energy surface. The change in the torsional coordinate upon excitation from $S_{0}$ to $S_{1}$ was also calculated from a Franck-Condon analysis of the intensities within the torsional progression and this change, in conjunction with the potential surface derived for $S_{1}$ was used to find the equilibrium torsional geometry in $S_{0}$. Evidence was also found for assigning the origin transition of a second ground state conformer. Spectra were also recorded of two other compounds having a cyclohexene ring in conjugation with a styryl group. The molecular conformations predicted from these spectra will also be discussed.

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Author Institution: Department of Chemistry and Center for Photochemical Sciences,, Bowling Green State University

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