An Ultrasonic Method for Determination of the Difference in Hard-Sphere Volume of Conformational Isomers

An ultrasonic method for determining the difference in hard-sphere volume of conformational isomers from sound velocity has been worked out, its accuracy being improved by taking the temperature dependence of the effective hard-sphere diameter into account. The difference for 1,2-dibromoethane, 1,1,2-trichloroethane, methylcyclohexane, and 1,2-dichloroethane was determined. The fractions of volume differences ΔV⁄V in these liquids were found to be 4.5, 5, 11, and 19% for 1,2-dibromo-, 1,1,2-trichloroethane, methylcyclohexane, and 1,2-dichloroethane, respectively.