The Normal Coordinates of N‐Dimethylaminodiborane

The multiple origin method has been utilized for the selection of initial coordinates for the description of the normal vibrations of N‐dimethylaminodiborane. Symmetry considerations were then used in order to obtain symmetry coordinates from these MOM coordinates, and, under the assumption of a diagonal potential function, these coordinates were assigned to vibrational frequencies which have been recently reported by Mann. The valence force constants for the methyl‐N‐methyl framework vibrations were then calculated and the results compared with similar constants obtained from the dimethylamine molecule.