FTIR SPECTRA OF NH3-METHYLAMINE COMPLEXES IN SOLID ARGON

Infrared spectra of 1:1 complexes of NH3 with mono-, di- and trimethylamines in solid argon have been recorded. Absorptions assigned to the nu-3-c-, nu-1-c-, and 2-nu-4-c-like modes of the NH3 submolecule in each ammonia-methylamine complex were observed red-shifted 5-7 cm-1 from the three strong modes in (NH3)2. On the basis of the similarity of the corresponding (NH3)2 spectrum and the positions of the N-H stretching absorptions in the NH3-methylamine complexes, the more strongly perturbed NH3 submolecule in (NH3)2 occupies a similar bonding role as the NH3 subunit in the above complexes. Furthermore, the structures of the complexes appear to be similar to that of (NH3)2.