| S. No. | Frequency (cm−1) | Assignment | Description |
| 1 | 3300 | Amide A | N-H stretching |
| 2 | 3100 | Amide B | N-H stretching |
| 3 | 1600-1690 | Amide I | C=0 stretching |
| 4 | 1480-1575 | Amide II | CN stretching |
| 5 | 1229-1301 | Amide III | N-H bending |
| 6 | 625-767 | Amide IV | N-H bending |
| 7 | 640-800 | Amide V | OCN bending |
| 8 | 537-606 | Amide VI | Out of plane bending |
| 9 | 200 | Amide VII | C=O bending skeletal torsion |