THE PURE ROTATIONAL RAMAN SPECTRA OF CYCLO-OCTATETRAENE, CYCLOOCTADIENE, AND s-TRIAZIKE
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Date
1977
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Ohio State University
Abstract
The pure rotational Raman spectra of 1,3,5,7-cyclooctatetraene $(C_{8}H_{8})$ 1,5-cyclooctadiene $(C_{8}H_{12})$ and s-triazine $(C_{3}N_{3}H_{3})$ vapor at pressures of 4, 2, and 7 Torr, respectively, have been photographed under high resolution using the lines 4880 {\AA} and 4765 {\AA} of a single mode argon ion laser. The spectra were recorded on Kodak IIIa-J plates hypersensitized by baking in a nitrogen atmosphere. The spectra of cyclooctatetraene and s-triazine resemble those of symmetric top rotators with well developed R-and S-branches. For cyclooctadiene R-branch lines are barely present and measurements were made only on S-branch lines. The molecular constants found from the analysis of the spectra are for 1,3,5,7-cyclooctatetraene: $B_{0} = 0.090392(2) cm^{-1}, D_{J} = 1.34(2) \times 10^{-8} cm^{-1}$ 1,5-cyclooctadiene: $B_{0} = 0.090345(22)cm^{-1}, D_{J} = 7.12(34) \times 10^{-8} cm^{-1} s-triazine: B_{0} = 0.214783(4) cm^{-1} , D_{J} = 3.92(8) \times 10^{-8} cm^{-1}$. The constants for cyclooctatetraene and cyclooctadiene are averages over several conformers present concurrently in the sample as well as over the low-lying vibrational states which are populated at room temperature. The results for s-triazine are slightly larger than those obtained by Lancaster and $Stoicheff.^{1}$
Description
$^{1}$ J. E. Lancaster and B, P. Stoicheff, Can. J. Phys. 34, 1016 (1956). This work has been supported, in part, by a grant from the National Science Foundation.
Author Institution: Department of Physics, Fordham University
Author Institution: Department of Physics, Fordham University