The triethylammonium-pyridine complex cation

The infrared spectra of the hydrogen bonded complex cation (triethylamine H⁺ pyridine) and of the three similar cations resulting from deuterium substitution in pyridine and at the bridge, have been examined in solution. The bridging proton occupies a potential with a single minimum closer to the triethylamine moiety. The V_s band structure is ascribed to Fermi resonance with triethylamine mode combinations. The N · N stretching mode of this complex, and also of the (trimethylamine H⁺ pyridine) complex have been observed in the far-infrared range.The present complex is weaker than the corresponding trimethylamine one.