Dielectric studies of 1-chloro-2-bromoethane in the liquid state

Abstract

The value of the activation energy for dielectric relaxation in 1-chloro-2-bromoethane in the liquid state obtained from dielectric studies in different microwave regions and at different temperatures is found to be 1 kcal/mole which is in good agreement with the calculated value of the difference of electrostatic energies of 0.9 kcal/mole between the gauche and trans isomers in the liquid state. This activation energy is also almost equal to the amount of lowering of the energy difference (940 cal/mole) between trans and gauche isomers of the molecule from the vapor to the liquid state obtained from spectroscopic studies. The energy difference of 550 cal/mole between the two isomers of the molecule in the liquid state calculated from the measured dipole moment values at different temperatures agrees fairly well with the spectroscopic value of 490 cal/mole.