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| Vibration mode | Frequency (cm−1) | |
|---|---|---|
| Theoretical | Observed | |
| N–H bridge (stretching) | 3587 | 3399.11 |
| Aromatic ring (C–H) stretching | 3151 | 3019.41 |
| Aromatic C C | 1652 | 1661.44 |
| C N stretching | 1622 | 1513.49 |
| Aliphatic CH2 stretching | 1480 | 1407.37 |
| C–N stretching | 1192 | 1243.88 |
