The Infra-Red Absorption Spectrum of Methyl Amine

Abstract

The parallel type methyl amine band at 10μ has been resolved. Its center is at 1045.27 cm—1, and the very regular structure of its P and R branches indicates a close approximation to axial symmetry. The mean of the two largest moments of inertia is 37.43 × 10—40 g·cm2. Assuming angles and distances for NH2 as in ammonia, and for CH3 as in methane, the C–N distance is computed to be 1.48 × 10—8 cm. Certain enhanced lines suggest a superposed perpendicular band. The 13μ band is partially resolved, and assigned to a motion corresponding to v3 in NH3. The bands arising from vibrations characteristic of the amino and methyl groups have been examined but could not be resolved.