| Wavenumber (cm-1) |
Assignment |
Band numbers |
| 1738/1734 |
C=O stretching vibration in acetyl groups on hemicelluloses |
1 |
| 1655 |
C=O stretch in conjugated carbonyl groups |
2 |
| 1593 |
Aromatic skeletal vibration plus C=O stretch |
3 |
| 1372 |
Aliphatic C–H stretch in CH3 |
4 |
| 1268 |
Guaiacyl ring breathing, C–O stretch in lignin and C–O linkage in guiacyl aromatic methoxyl groups |
5 |
| 1240 |
Syringyl ring and C–O stretching vibration in lignin, xylan and ester groups |
6 |
| 1050 |
C–O stretch in cellulose and hemicellulose |
7 |
| 1035 |
C–O deformations in primary alcohols, aromatic C–H in-plane deformation |
8 |
| 896 |
C–H deformation vibration in cellulose |
9 |
