INFRARED AND RAMAN SPECTRA OF FLUORINATED ETHANES. XII. 1,1,2,2- TETRAFLUOROETHANE

Journal Article · Tue Mar 01 04:00:00 EST 1960 · Journal of Chemical Physics (U.S.)

DOI:https://doi.org/10.1063/1.1730815· OSTI ID:4174854

Klaboe, P; Nielsen, J R

The infrared absorption specta of gaseoils CHF/sub 2/-CHF/sub 2/ at five temperatures between 30 and 170 deg C and of the crystalline solid at -- 170 deg C were obtained with a PerkinElmer double-pass spectrometer equipped with CsBr, NaCl, and LiF prisms. The Raman spectrum of the liquid at 20, --25, and -- 80 deg C was photographed with a 3-prism glass spectrograph of reciprocal linear dispersion 15 A/ mm at 4358 A, and polarization measurements were made. In the gaseous and liquid states the compound exists as a mixture of two rotational isomers of symmetries C/sub 2h/ and C/sub 2/, respectively, the former (trans) being the more stable. In the crystalline state only the trans configuation was present. A value of 1160 plus or minus 100 cal/mole was found for the enthalpy difference DELTA H/sup 0/ in the gas. In the liquid, DELTA H/sup 0/ was much smaller. With some uncertainties, the vibrational fundamentals were assigned for each isomer. (See also NSA Vol. II abstact No. 9243.) (auth)

• Research Organization: Univ. of Oklahoma, Norman
• Sponsoring Organization: USDOE
• NSA Number: NSA-14-012968
• OSTI ID: 4174854
• Journal Information: Journal of Chemical Physics (U.S.), Journal Name: Journal of Chemical Physics (U.S.) Vol. Vol: 32; ISSN JCPSA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CESIUM BROMIDES
CRYSTALS
ENTHALPY
FLUORINATED HYDROCARBONS
GASES
INFRARED RADIATION
ISOMERS
LIQUIDS
LITHIUM FLUORIDES
LOW TEMPERATURE
MEASURED VALUES
METALS, CERAMICS, AND MATERIALS
OPTICAL SYSTEMS
PHOTOGRAPHY
POLARIZATION
RAMAN EFFECT
SODIUM CHLORIDES
SOLIDS
SPECTRA
SPECTROMETERS
TEMPERATURE
THERMODYNAMICS
VIBRATIONS