Accession Number:

AD0270877

Title:

ROTATIONAL ISOMERISM OF UNBRANCHED 1-ALKENES BY INFRARED SPECTRA

Descriptive Note:

Corporate Author:

AERONAUTICAL SYSTEMS DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

• HARRAH,LARRY A.

Report Date:

1961-03-01

Pagination or Media Count:

1.0

Abstract:

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 14000 to 1240 cm. The spectra of the crystalline solid states of some of the igher 1-alkenes in the range 1700 to 1500 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. Author

Descriptors:

• *BUTENES
• *ALKENES
• *ETHYLENES
• *MOLECULAR ISOMERISM
• *PROPENES
• GASES
• INFRARED SPECTROPHOTOMETERS
• INFRARED SPECTROSCOPY
• IODIDES
• NUCLEAR ISOMERS
• STEREOCHEMISTRY

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE