Internal Rotation II The Energy Difference between the Rotational Isomers of 1,2-Dichloroethane

Abstract

From the variation of the intensities of infra-red bands with temperature the value of ΔH0 for the reaction C2h dichloroethane →C2 dichloroethane is found to be 1250±50 cals. per mole. The probable energy difference between the isomers is 1100±50 cal. per mole. A tentative assignment of all the fundamentals has been made. Peak intensities and integrated intensities yield the same results within the limits of the experimental error. The ratio of the number of C2 molecules to the number of C2h molecules at room temperature is 0.29.