Self-association of N-methylaniline by hydrogen bonds has been examined. The fundamental of the NH stretching vibration and its first and second overtones were measured in solution down to −190°C. In addition to the band due to the free species, two bands due to oligomers and a polymer band are found. The anharmonicity of the oligomer NH vibrations is practically the same as that of the free NH vibration. The spectrum of the N-deuterated molecule yields similar results.
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Bernard-Houplain et al. (1972) studied this question.
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