VIBRATIONAL SPECTRA AND ASSIGNMENT FOR 3,3,4,4-TETRAFLUOROCYCLOBUTENE-$D_{0}$-$D_{1}$, AND $-D_{2}$
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Date
1992
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Publisher
Ohio State University
Abstract
The three hydrogen-deuterium isotopomers of tetrafluorocyclobutene are near-prolate symmetric tops. The two $C_{2{v}}$ species are unusual in having their dipole axes perpendicular to the pseudo-figure axis, $I_{a}$. In addition, the $I_{a}$ axis is parallel to the dipole axis in the $d_{0}$ species but perpendicular to it in the $d_{2}$ species. 1 Under these circumstances B-type and C-type band shapes are essentially indistinguishable in gas-phase infrared spectra. Nonetheless, a reasonably complete and convincing assignment of vibrational fundamentals can be made from the infrared and Raman spectra of the three isotopomers, considered together. For the $d_{0}$ species selection rules and fundamentals (in $cm^{-1}$) are ($a_{1}$; IR, C-type; R, pol) 3154, 1564, 1350, 1155, 1025, 755, 500, 277; ($a_{2}$; IR, -; R, dp) --, 966, 348, --, 132; ($b_{1}$ IR, A-type; R, dp) 3108, 1338, 1177, 1058, 730, 614, 431; ($b_{2}$ IR, B-type; R, dp) 1340, 799, 366, 208.
Description
1. A. E. Andrews, S. L. Maruca, K. W. Hillig II, R. L. Kuczkowski, and N. C. Craig, J. Phys. Chem. 95, 7714 (1991).
Author Institution: Department of Chemistry, Oberlin College
Author Institution: Department of Chemistry, Oberlin College