| Absorption Bands | CP[BTA]A (cm–1) | CP[BTA]NA (cm–1) |
|---|---|---|
| NH2, N-H stretching | 3425 | 3460 |
| Ar-C-NO2 stretching | - | 1445 |
| N-C=S stretching | 1305 | 1320 |
| C=S stretching | 1175 | 1180 |
| Ar-C-OCH3asym. stretching | 1250 | - |
| Ar-C-OCH3 sym. stretching | 1020 | - |
| C-H, Deformation (“oop”) | 840 | 848.7 |