Topic summary
Secondary amine
Extracted from the Wikipedia article Amine.
Spectroscopic identification
Typically the presence of an amine functional group is deduced by a combination of techniques, including mass spectrometry as well as NMR and IR spectroscopies. H NMR signals for amines disappear upon treatment of the sample with D2O. In their infrared spectrum primary amines exhibit two N–H bands, whereas secondary amines exhibit only one. In their IR spectra, primary and secondary amines exhibit distinctive N–H stretching bands near 3300 cm. Somewhat less distinctive are the bands appearing below 1600 cm, which are weaker and overlap with C–C and C–H modes. For the case of propylamine, the H–N–H scissor mode appears near 1600 cm, the C–N stretch near 1000 cm, and the R2N–H bend near 810 cm.