Abstract
A new heterodyne-beat apparatus has been employed to determine the dipole moment of acetonitrile from —60° to +60° and that of succinonitrile from —90° to +90° in solution. By assuming each half of the succinonitrile molecule to have the same moment as the acetonitrile molecule, the observed moments have been used to calculate the height of the potential barrier which restricts rotation around the carbon-carbon single bond in succinonitrile and thereby causes the moment of the molecule to increase with rising temperature. The value 1.2±0.5 kcal. thus obtained is in better agreement with the value 1.5 obtained from the calculation of the sum of the various potential energies existing between the two halves of the molecule than is warranted by the necessarily approximate nature of the calculation.
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