| NAM powder (cm−1) | Sample NAM-Cu (cm−1) | Tentative assignement |
| 1680 | - | ν (C = O) |
| 1617 | 1599 | NH2scis |
| 1599 | 1581 | ν (C = C)ring, ν (C = N)ring |
| 1581 | 1530 | νring |
| 1391 | 1406 | νCNamide + δ (CCH) |
| 1161 | 1198 | νring + δ (CCH) |
| 1125 | - | δ (CH) |
| 1096 | - | NH2rock |
| 1045 | 1034 | Pyridine ring breathing |
| 943 | - | γ (CH), C-NH2 |
| 834 | 845 | ring N in pyridine nuclei |
| 790 | 797 | δring |
| 648 | 661 | γring |
| 630 | 644 | δring |
| 389 | 400 | NH2wagging |