| Group Frequencies (cm-1) | Funtional group/assignment |
|---|---|
| 1270 - 1230 | Aromatic ethers, C-O stretch |
| 1380 - 1350 | Aliphatic nitro compounds/nitrate ion |
| 1555 - 1485 | Aromatic nitro compounds |
| 1650 - 1600 | Quinone or conjugated ketone |
| 1680 - 1630 | Amide |
| 1740 - 1725 | Aldehyde |
| 1725 - 1700 | Carboxylic acid |
| 1870 - 1820 | Five-membered ring anhydride |
| 3250 - 3650 | Hydroxyl/Amino group |
| 3350 - 3320 | Imino compounds, NH stretch |
| 3490 - 3430 | Heterocyclic amine, NH stretch |
| 3670 - 3550 | Non-hydrogen-bonded hydroxyl group |