The Structure and Internal Motion of 1,2-Dichloroethane

The structure and internal motion of 1,2-dichloroethane were investigated by means of electron diffraction. Values were obtained for several distances involving hydrogen atoms. In addition, the average amplitude of vibration was found for many of the distances. The predominant isomer was in the trans-form and the less abundant one was in the gauche-positions at 109±5° from the trans-equilibrium position. The amount of gauche-isomer was found to be 27±5 percent at 22°C.