♦NH tension: between 3500 and 3300 cm ^-1 . The primary amines present two bands (symmetric and asymmetric), the secondary ones only one band.

♦ NH bending: Primary amines two bands at 1640 and 1560 cm ^-1 . Secondaries a band at 1500 cm ^-1

Aromatic amines have more intense bands than aliphatic ones.