# INFRARED STUDIES OF ROTATIONAL ISOMERISM IN $CF_{2}CL-CF_{2}CL$ AND $CF_{2}BR-CF_{2}CL$

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 dc.creator Kagarise, R. E. en_US dc.date.accessioned 2006-06-15T12:49:12Z dc.date.available 2006-06-15T12:49:12Z dc.date.issued 1956 en_US dc.identifier 1956-W-1 en_US dc.identifier.uri http://hdl.handle.net/1811/7580 dc.description Author Institution: Chemistry Division, Naval Research Laboratory en_US dc.description.abstract The phenomenon of rotational isomerism has been studied in $CF_{2}CL-CF_{2}CL$ and $CF_{2}BR-CF_{2}CL$ by observing the temperature and state dependence of their infrared absorption spectra in the $2-18\mu$ region. In $CF_{2}CL-CF_{2}CL$, the trans isomer persists in the crystalline solid, and is also the more stable form in the liquip and vapor states. The energy difference between the trans ($C_{2}H$) and gauche ($C_{2}$) forms in the vapor was observed to be 500 $\pm$ 200 calories/mole. In $CF_{2}BR-CF_{2}CL$, the selection rules for the two probable isomeric species ($C_{s}$ and $C_{1}$) are not sufficiently different to facilitate a direct determination of the symmetry of the form which persists in the solid state. However, a comparison of the infrared spectrum of $CF_{2}BR-CF_{2}CL$ with those of $CF_{2}CL-CF_{2}CL$ and $CF_{2}BR-CF_{2}BR$ indicates that the persistent isomer is the pseudo-trans form ($C_{s}$ symmetry). This trans form is also the more stable isomer in both the liquid and vapor phases, the energy difference being 520 $\pm$ 200 and 600 $\pm$ 200 calories/mole, respectively. en_US dc.format.extent 101932 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title INFRARED STUDIES OF ROTATIONAL ISOMERISM IN $CF_{2}CL-CF_{2}CL$ AND $CF_{2}BR-CF_{2}CL$ en_US dc.type article en_US