# SPECTROSCOPY AND CONFORMATION OF 2-PHENYLIDOLE

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/29786

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 Title: SPECTROSCOPY AND CONFORMATION OF 2-PHENYLIDOLE Creators: Sinclair, Wayne E.; Yu, Hua-Gen; Phillips, D. Issue Date: 1995 Publisher: Ohio State University Abstract: Employing techniques of fluorescence excitation and dispersed fluorescence, we have recorded the $S_{1} \leftarrow S_{0}$ electronic spectra of 2PI in a supersonic jet. All spectra exhibit extended low frequency progressions which we assign to torsional motion around the bond joining the benzene and indole moieties. The $S_{0}$ and $S_{1}$ torsional potentials have been determined from a vibrational analysis of the spectra by fitting the torsional vibrational spacings to a one-dimensional potential of the form $V(\phi) = {^{1}}/_{2} \Sigma V_{n} (1-\cos {\rm n} \phi)$. The potentials provide a detailed picture of the conformations of 2PI in $S_{0}$ and $S_{1}$, yielding accurate torsional barriers. Additional features displayed in the spectra provide interesting information about vibronic coupling effects involving the $S_{1}$ and $S_{2}$ states of 2PI. Description: Author Institution: University of Pittsburgh, Pittsburgh, PA 15260.; Imperial College, London SW7 2AY, UK. URI: http://hdl.handle.net/1811/29786 Other Identifiers: 1995-TE-07