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Rotational Isomerism Of Unbranched 1-alkenes By Infrared Spectra

Report Number: WADD TR 61-82
Author(s): Larry A. Harrah
Corporate Author: Physics Laboratory
Date of Publication: 1961-03
Pages: 62
AD Number: AD0270877

The IR spectra of the 1-alkenes from 1-butene to 1-hexadecene together with the spectra of 3 bromo-, 3 iodo-, and 3 cyanpropene were studied over the range from 1/4000 to 1/240 cm. The spectra of the crystalline solid states of some of the igher 1-alkenes in the range 1/700 to 1/500 cm are shown and in conjunction with the corresponding liquid state spectra indicate the presence of rotational isomerism about the carbon-carbon bond in the 1-alkenes. The potentials for rotation about the 2,3 carbon-carbon bond are derived from the observed spectra together with an empirical relationship for hydrogen-hydrogen steric interactions. The fundamental vibrational assignment was made f r 1-butene and the IR spectrum of the vapor interpreted on the basis of this assignment. The cell used to obtain the solid state spectra of t e 1-alkenes is described in detail.

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