Number | Wavenumber (cm−1) | Functional groups and structures assignment |
---|---|---|
1 | 3420 | OH stretching vibration |
2 | 3210 | OH stretching vibration |
3 | 3050 | OH stretching vibration |
4 | 2860 | C–H stretching in aromatic methoxyl groups |
5 | 1650 | Absorbed O–H and conjugated C–O |
6 | 1635 | C=C stretching vibration peak in benzene ring |
7 | 1600 | Aromatic skeletal vibrations and C=O stretch; S > G |
8 | 1511 | Aromatic skeletal vibrations; G > S |
9 | 1420 | Aromatic skeletal vibrations combined with O–CH3 in plane deform |
10 | 1317 | C–O in syringyl group |
11 | 1275 | C–O in guaiacyl group |
12 | 1090 | C–O vibrations in aliphatic ethers and/or in secondary alcohols |
13 | 1041 | C–O in guaiacyl group |
14 | 618 | Stretching vibrations of the C–S bond linked to the aromatic ring |