VIBRATIONAL SPECTRA OF CYCLOBUTANE, OCTAFLUORO-, OCTACHLORO-, AND OCTAHYDROXY-CYCLOBUTANE.
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Date
1969
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Ohio State University
Abstract
Infrared spectra from 33 to $4000 cm^{-1}$ and the Raman spectra with polarizations have been obtained for cyclo-$C_{4}F_{8}, cyclo-C_{4}Cl_{8}$ and cyclo-$C_{4}(OH)_{8}$. Assignment of the fundamental frequencies to the normal modes for cyclo-$C_{4}F_{8}$ and cyclo-$C_{4}Cl_{8}$ has been made on the basis of $D_{2d}$ symmetry (folded-ring). For cyclo-$C_{4}(OH)_{8}$, however, the symmetry is clearly $D_{4th}$ (planar ring). The reason for this difference will be discussed. The most interesting vibration of these 4-membered cyclic systems is the ring puckering mode. It is forbidden in both the infrared and Raman spectrum under $D_{4h}$, but is allowed in the Raman spectrum under $D_{2d}$. We have observed it for liquid cyclo-$C_{4}Cl_{8}$ at $66 cm^{-1}$ and for liquid cyclo-butane at $187 cm^{-1}$. New Raman polarization data for cyclo-$C_{4}F_{8}$ require some alteration of the assignments by Bauman and $Bulkin^{1}$.
Description
$^{1}$ R.P. Bauman and B.J. Bulkin. J. Chem. Phys 45, 496 (1966).
Author Institution: Department of Chemistry, University of Pittsburgh
Author Institution: Department of Chemistry, University of Pittsburgh