Table 1.
Infrared spectra and assignments of the main bands (cm−1) of the compounds resorcinol, vanillin and resvan.
| Assignment | Resorcinol | Vanillin | Resvan |
|---|---|---|---|
| νO-H (phenol) | 3447 | 3447 | 3411 |
| νC-H (aromatic) | 3012 | 3013 | 3008 |
| νC-H (aldehyde) | 2855 | ||
| νC=O (aldehyde) | 1666 | ||
| νC-C (benzene) | 1616 | 1596 | 1616 and 1518 |
| νCH3 (methoxy) | 1463 | 1463 | |
| δCH (methine bridge) | 1430 | ||
| νC-CHO (aldehyde) | 1265 | ||
| νC-O (ether) | 1200 | 1204 | |
| δCH3 (methoxy) | 1172 | ||
| νC-OH | 1150 | 1155 | 1154 |
| δCCH (in-plane) | 1123 | 1123 | |
| νO-CH3 | 1028 | 1030 | |
| δC-C-CHO (out-of-plane) | 732 | ||
| δC-C=O (in-plane) | 588 |