FTIR Functional Group Database Table with Search
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FTIR Functional Group Database Table with Search - InstaNANO. https://instanano.com/all/characterization/ftir/ftir-functional-group-search/ (accessed December 5th, 2025).
FTIR Functional Group Database Table with Search - InstaNANO. https://instanano.com/all/characterization/ftir/ftir-functional-group-search/ (accessed December 5th, 2025).
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| Peak Position | Group | Class | Peak Details |
|---|---|---|---|
| 3584-3700 | O-H stretching (free) | alcohol, phenol | strong, sharp |
| 3500-3700 | O-H stretching (free) | phenol, alcohol | strong, sharp |
| 3200-3550 | O-H stretching (hydrogen-bonded) | alcohol | strong, broad |
| 3500 | N-H stretching | primary amine | medium, sharp |
| 3300-3400 | N-H stretching | aliphatic primary amine | medium, sharp |
| 3310-3350 | N-H stretching | secondary amine | medium, sharp |
| 3050-3100 | C-H stretching (aromatic) | aromatic hydrocarbon | medium to weak |
| 2500-3300 | O-H stretching | carboxylic acid | very strong, very broad |
| 2700-3200 | O-H stretching | alcohol | weak, broad |
| 2800-3000 | N-H stretching | amine salt | strong, broad |
| 3267-3333 | C-H stretching | alkyne | strong, sharp |
| 3300 | ≡C–H stretching | terminal alkyne | strong, sharp |
| 3000-3100 | C-H stretching | alkene | medium |
| 2840-3000 | C-H stretching | alkane | medium |
| 2695-2830 | C-H stretching | aldehyde | medium (plus weak Fermi doublet at 2720, 2820) |
| 2550-2600 | S-H stretching | thiol | weak |
| 2349 | O=C=O stretching | carbon dioxide | strong |
| 2250-2275 | N=C=O stretching | isocyanate | strong, broad |
| 2222-2260 | C≡N stretching | nitrile | weak to medium, sharp |
| 2190-2260 | C≡C stretching | alkyne | weak |
| 2200-2250 | C≡C stretching | terminal alkyne | weak to medium, sharp |
| 2140-2175 | S-C≡N stretching | thiocyanate | strong |
| 2120-2160 | N=N=N stretching | azide | strong |
| 2150 | C=C=O stretching | ketene | typically sharp, medium |
| 2120-2145 | N=C=N stretching | carbodiimide | strong, sharp |
| 2100-2140 | C≡C stretching | alkyne | weak |
| 1990-2140 | N=C=S stretching | isothiocyanate | strong, sharp |
| 1900-2000 | C=C=C stretching | allene | medium, sharp |
| 2000 | C=C=N stretching | ketenimine | weak to medium, sharp |
| 1650-2000 | C-H bending | aromatic compound | weak |
| 1818 | C=O stretching | anhydride | strong, sharp |
| 1785-1815 | C=O stretching | acid halide | strong, sharp |
| 1770-1800 | C=O stretching | conjugated acid halide | strong, sharp |
| 1775 | C=O stretching | conjugated anhydride | strong, sharp |
| 1770-1780 | C=O stretching | vinyl / phenyl ester | strong, sharp |
| 1760 | C=O stretching | carboxylic acid | strong, sharp |
| 1735-1750 | C=O stretching | esters | strong, sharp |
| 1735-1750 | C=O stretching | δ-lactone | strong, sharp |
| 1745 | C=O stretching | cyclopentanone | strong, sharp |
| 1720-1740 | C=O stretching | aldehyde | strong, sharp |
| 1715-1730 | C=O stretching | α,β-unsaturated ester | strong, sharp |
| 1705-1725 | C=O stretching | aliphatic ketone | strong, sharp |
| 1706-1720 | C=O stretching | carboxylic acid | strong, broad |
| 1680-1710 | C=O stretching | conjugated acid | strong |
| 1685-1710 | C=O stretching | conjugated aldehyde | strong, sharp |
| 1690 | C=O stretching | primary amide | strong, sharp |
| 1640-1690 | C=N stretching | imine / oxime | strong |
| 1666-1685 | C=O stretching | conjugated ketone | strong, sharp |
| 1680 | C=O stretching | secondary amide | strong, sharp |
| 1680 | C=O stretching | tertiary amide | strong, sharp |
| 1650 | C=O stretching | δ-lactam | strong, sharp |
| 1668-1678 | C=C stretching | alkene | weak |
| 1665-1675 | C=C stretching | alkene | weak |
| 1626-1662 | C=C stretching | alkene | medium |
| 1648-1658 | C=C stretching | alkene | medium |
| 1600-1650 | C=C stretching | conjugated alkene | medium |
| 1580-1650 | N-H bending | amine | medium |
| 1566-1650 | C=C stretching | cyclic alkene | medium |
| 1638-1648 | C=C stretching | alkene | strong |
| 1610-1620 | C=C stretching | α,β-unsaturated ketone | strong |
| 1500-1550 | N-O stretching | nitro compound | strong |
| 1465 | C-H bending | alkane | medium |
| 1450 | C-H bending | alkane | medium |
| 1380-1390 | C-H bending | aldehyde | medium |
| 1380-1385 | C-H bending | alkane | medium |
| 1395-1440 | O-H bending | carboxylic acid | medium |
| 1330-1420 | O-H bending | alcohol | medium |
| 1380-1415 | S=O stretching | sulfate | strong, sharp |
| 1380-1410 | S=O stretching | sulfonyl chloride | strong, sharp |
| 1000-1400 | C-F stretching | fluoro compound | strong |
| 1310-1390 | O-H bending | phenol | medium |
| 1335-1372 | S=O stretching | sulfonate | strong, sharp |
| 1335-1370 | S=O stretching | sulfonamide | strong, sharp |
| 1342-1350 | S=O stretching | sulfonic acid | strong, sharp |
| 1300-1350 | S=O stretching | sulfone | strong, sharp |
| 1266-1342 | C-N stretching | aromatic amine | strong |
| 1250-1310 | C-O stretching | aromatic ester | strong, sharp |
| 1200-1275 | C-O stretching | alkyl aryl ether | strong, sharp |
| 1020-1250 | C-N stretching | amine | medium |
| 1200-1225 | C-O stretching | vinyl ether | strong, sharp |
| 1163-1210 | C-O stretching | ester | strong, sharp |
| 1124-1205 | C-O stretching | tertiary alcohol | strong, sharp |
| 1085-1150 | C-O stretching | aliphatic ether | strong, sharp |
| 1087-1124 | C-O stretching | secondary alcohol | strong, sharp |
| 1050-1085 | C-O stretching | primary alcohol | strong, sharp |
| 1030-1070 | S=O stretching | sulfoxide | strong, sharp |
| 1040-1050 | CO-O-CO stretching | anhydride | strong, broad |
| 985-995 | C=C bending | allene | strong, sharp |
| 970-990 | =C–H out-of-plane bending | trans-alkene | strong, sharp |
| 960-980 | C=C bending | alkene | strong, sharp |
| 905-920 | =C–H out-of-plane bending | vinyl group | medium |
| 885-895 | C=C bending | alkene | strong |
| 790-840 | C=C bending | alkene | medium |
| 665-730 | C=C bending | alkene | strong |
| 650-900 | C-H out-of-plane bending | aromatic substitution | pattern analysis, medium to strong |
| 515-690 | C-Br stretching | halo compound | strong |
| 500-600 | C-I stretching | halo compound | strong |
| 700-800 | C-Cl stretching | alkyl halide | strong, sharp |
| 550-850 | C-Cl stretching | halo compound | strong |
| 860-900 | C-H bending | 1,2,4-trisubstituted benzene | strong |
| 860-900 | C-H bending | 1,3-disubstituted benzene | strong |
| 790-830 | C-H bending | 1,4-disubstituted benzene | strong |
| 790-830 | C-H bending | 1,2,3,4-tetrasubstituted benzene | strong |
| 760-800 | C-H bending | 1,2,3-trisubstituted benzene | strong |
| 735-775 | C-H bending | 1,2-disubstituted benzene | strong |
| 730-770 | C-H bending | monosubstituted benzene | strong |
| 400-600 | M–O stretching | metal–oxygen (inorganic) | strong, broad |
| 680-720 | benzene derivative | aromatic out-of-plane C–H bending |
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