Abstract
The broad ν s (NH stretching) band in the i.r. spectra of the complex cations (TMAH B) +, where TMA is Trimethylamine, and B is Isooxazole, Thiazole, Pyridine, 3-Me Pyridine, 4-Me Pyridine, or methyl Imidazole, moves to lower frequency as the pK of B increases. A ‘window’ remains fixed at ∼ 2600 cm −1. This is ascribed to Fermi resonance of ν s with a TMA combination mode, and implies the bridging proton is closer to the TMA.
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