| Compound | IR Characteristic bands, cm−1 | ||||||
| υ(C-S) | υ(C=N) | υ(S-H) | υ(N-H) | υ(C-N) | υ(C=C) | υ(NH2) | |
| 1 | 750 | 1600 | 2600 | 3250 | 1070 |
| 3093 - 3350 |
| 2 | 750 | 1550 | 2550 |
|
|
|
|
| 3 | 730 | 1610 |
| 3300 | 1200 |
| 3300 |
| 4 | 750 | 1640 |
| 3300 | 1210 |
| 3400 |
| 5 | 730 | 1650 | 2580 |
|
| 1560 |
|
| 6 | 750 | 1650 | 2580 |
|
| 1610 |
|