Table 1.
The fundamental wavenumbers (cm−1) of the Schiff base.
| 3462 | υ (OH) | |
|---|---|---|
| 3373w | 3299 | υ (CH) furan ring |
| 3155w 3101w |
3158 3062 |
υ (CH3) antisymmetric υ (CH3) symmetric |
| 3082w, 2973w | 3192, 3184 | υ (sp2 alkene moiety) |
| 1661m | 1687 | υ C=N imino group |
| 1611w | 1648 | υ (C=N) isoxazole ring |
| 1593s | 1622 | 1593s |
| 1502s | 1599 | 1502s |
| 1463s | 1502, 1431 | υ furan moiety |
| 1374–1389s | 1483, 1300 | υ isoxazole ring vibrations |
| 1326s | 1415 | υ (SO2) antisymmetric |
| 1156vs | 1187 | υ (SO2) symmetric |
| 925s | 883 | υ (SN bond stretching) |
| 882w | 831 | υ out-of-plane CH (isoxazole ring) |