CHARACTERIZATION OF STRUCTURAL ISOMERS OF NAPHTHALENE: ELECTRONIC SPECTROSCOPY OF Z-PHENYLVINYLACETYLENE
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Date
2009
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Publisher
Ohio State University
Abstract
In a variety of contexts from planetary atmospheres to combustion processes, the appearance of C$_{10}$H$_8$ is commonly attributed to naphthalene. Often neglected are other stable C$_{10}$H$_8$ isomers that could be formed prior to isomerization to naphthalene, such as phenylvinylacetylene (PVA, 1-phenyl-1-buten-3-yne). The electronic spectroscopy of the E isomer of PVA has already been reported, \textbf {112}, 9454 (2008).} but direct isomerization to naphthalene would seem more likely from the Z isomer. Here, we report the jet-cooled laser induced fluorescence and single vibronic level dispersed fluorescence spectra of Z-PVA. The spectra display low frequency vibronic structure reminiscent of that in styrene, attributable to the out-of-plane torsion and bend of the vinylacetylene group. The vibrational assignments are assisted by \textit{ab initio} calculations and the results are compared with the analogous motions in styrene. Interestingly, the excitation spectrum shows a dramatic decrease in fluorescence intensity about 600 \wn above the electronic origin. This intensity drop off is attributable to a turn on in nonradiative processes.
Description
C. P. Liu, J. J. Newby, C. W. Muller, H. D. Lee, and T. S. Zwier \textit{J. Phys. Chem. A.
Author Institution: Department of Chemistry, Purdue University, West Lafayette, IN 47907
Author Institution: Department of Chemistry, Purdue University, West Lafayette, IN 47907