| Peak items | Main wavenumber (cm−1) | Vibrations |
| Saturated hydrocarbon | 1475–700, 1375–1380, 1400, 720 | C-H, C-C, C-CH3, H-C-H, -CH2-, | Aromatic hydrocarbon | 3030, 1600–1500, 1500–1480, 1610–1500, 1650–1600, 1525–1450, 2000–1670 | C-H, C=C | Carboxyl compound | 1725, 1690, 2820, 2720, 1700–1670, 1690–1600, 3550, 3200–2500, 1700–1680, 920, 1860–1750, 1740, 1700, 1300–1050, 1210–1160 | C=O, O-H, C-O-C | Hydroxy compound | 2700–2500 | -COOH | Nitrogen-containing compound | 3050, 1690–1650, 1640–1600, 1400, 1680–1655, 1550–1530, 1300, 620 | C-H, C-N, O=C-N | Sulfur-containing compound | 2992–2955, 2897–2869, 1090, 2590–2560, 1065–1030, 520–430 | S-C, ArSH, S=O, S-S |
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