| Wave number (cm−1) | Assignments |
| 3330 | asymmetric N-H stretching |
| 3082 | asymmetric C-H stretching |
| 2782 | symmetric C-H stretching vibration of methyl group |
| 1966 | overtones and combinations |
| 1638 | C=C stretching due to the aromatic ring |
| 1549 | asymmetric stretching of NO2 group |
| 1494 | COO stretching |
| 1442 | -CH3 asymmetric bending |
| 1369 | -CH3 symmetric bending |
| 1315 | symmetric stretching of NO2 group |
| 1270 | C-O stretching |
| 1233 | N-H…S hydrogen bonding |
| 1158 | C-H bending |
| 1079 | Ρ (NH2) |
| 1051 | C-N stretching |
| 1022 | C-H bending (in plane) |
| 963 | C-H bending |
| 936 | C-H deformation |
| 907 | C-NO2 stretching |
| 894 | C-C-N symmetric stretching |
| 827 | NO2 scissoring |
| 794 | C-H bending (out of plane) |
| 751 | NO2 wagging |
| 698 | C-H bending (out of plane) |
| 546 | NO2 rocking |
| 522 | NO2 scissoring |
| 506 | δ(N-C-S) |