Measurement of the dipole moments of seven partially fluorinated hydrocarbons with a radiofrequency reentrant cavity resonator

Equilibrium dipole moments of gaseous pentafluorodimethyl ether (HFE-1251, 1,1,1,2,3,3,3-heptafluoropropane ( H FC-227ea ), I,l,l,2,3,3-hexafluoropropane (HFC-236ea), l,l,l,3,3,3-hexafluoropropane (HFC-236fa), l,l,2,2,3-pentafluoropropane ( H FC-245ca), l,l,l,2,2-pentafluoropropane (HFC-245fa), and I,l,l,2,2,3,3,4-octafluorobutane (HFC-338mccq) were obtained from the resonance frequency of a reentrant cavity at temperatures between 250 and 373 K. The electronic contributions to tbe polarization were determined for each fluid from liquid-phase optical index of refraction measurements at 297 K.