Characterization of Structural Isomers of Naphthalene: Electronic Spectroscopy of Z-Phenylvinylacetylene

Details Characterization of Structural Isomers of Naphthalene: Electronic Spectroscopy of Z-Phenylvinylacetylene Characterization of Structural Isomers of Naphthalene: Electronic Spectroscopy of Z-Phenylvinylacetylene

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mss..confetb02n&link_type=abstract

"International Symposium On Molecular Spectroscopy, 64th Meeting, Held 22-26 June, 2009 at Ohio State University. http://molspec

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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, 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 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.
C. P. Liu, J. J. Newby, C. W. Müller, H. D. Lee, and T. S. Zwier J. Phys. Chem. A. 112, 9454 (2008).

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