Electron diffraction study of gaseous dimethylamine and trimethylamine

The molecular structures of dimethylamine and trimethylamine in the gas phase have been determined accurately by electron diffraction. The C—N bond lengths in the two molecules are equal (1.455 Å; reproducibility 0.002 Å). This value is 0.010 Å less than that obtained by Bartell in methylamine. The C—N—C angles are 111.8 and 110.6°, respectively (reproducibilities 0.6°).