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Chemistry LibreTexts

Infrared Spectroscopy Absorption Table

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The following table lists infrared spectroscopy absorptions by frequency regions.

4000-3000 cm-1
3700-3584 medium sharp O-H stretching alcohol free
3550-3200 strong broad O-H stretching alcohol intermolecular bonded
3500- 3400 medium - N-H stretching primary amine -
3400-3300
3330-3250
medium - N-H stretching aliphatic primary amine -
3350-3310 medium - N-H stretching secondary amine -
3300-2500 strong broad O-H stretching carboxylic acid usually centered on 3000 cm-1
3200-2700 weak broad O-H stretching alcohol intramolecular bonded
3000-2800 strong broad N-H stretching amine salt -
3000-2500 cm-1
3333-3267 strong sharp C-H stretching alkyne -
3100-3000 medium - C-H stretching alkene -
3000-2840 medium - C-H stretching alkane -
2830-2695 medium - C-H stretching aldehyde doublet
2600-2550 weak - S-H stretching thiol -
2400-2000 cm-1
2349 strong - O=C=O stretching carbon dioxide -
2275-2250 strong broad N=C=O stretching isocyanate -
2260-2222 weak - CΞN stretching nitrile -
2260-2190 weak - CΞC stretching alkyne disubstituted
2175-2140 strong - S-CΞN stretching thiocyanate -
2160-2120 strong - N=N=N stretching azide -
2150 - - C=C=O stretching ketene -
2145-2120 strong - N=C=N stretching carbodiimide -
2140-2100 weak - CΞC stretching alkyne monosubstituted
2140-1990 strong - N=C=S stretching isothiocyanate -
2000-1900 medium - C=C=C stretching allene -
2000 - - C=C=N stretching ketenimine -
2000-1650 cm-1
2000-1650 weak - C-H bending aromatic compound overtone
1870-1540 cm-1
1818
1750
strong - C=O stretching anhydride -
1815-1785 strong - C=O stretching acid halide -
1800-1770 strong - C=O stretching conjugated acid halide -
1775
1720
strong - C=O stretching conjugated anhydride -
1770-1780 strong - C=O stretching vinyl / phenyl ester -
1760 strong - C=O stretching carboxylic acid monomer
1750-1735 strong - C=O stretching esters 6-membered lactone
1750-1735 strong - C=O stretching δ-lactone γ: 1770
1745 strong - C=O stretching cyclopentanone -
1740-1720 strong - C=O stretching aldehyde -
1730-1715 strong - C=O stretching α,β-unsaturated ester or formates
1725-1705 strong - C=O stretching aliphatic ketone or cyclohexanone or cyclopentenone
1720-1706 strong - C=O stretching carboxylic acid dimer
1710-1680 strong - C=O stretching conjugated acid dimer
1710-1685 strong - C=O stretching conjugated aldehyde -
1690 strong - C=O stretching primary amide free (associated: 1650)
1690-1640 medium - C=N stretching imine / oxime -
1685-1666 strong - C=O stretching conjugated ketone -
1680 strong - C=O stretching secondary amide free (associated: 1640)
1680 strong - C=O stretching tertiary amide free (associated: 1630)
1650 strong - C=O stretching δ-lactam γ: 1750-1700 β: 1760-1730
1670-1600 cm-1
1678-1668 weak - C=C stretching alkene disubstituted (trans)
1675-1665 weak - C=C stretching alkene trisubstituted
1675-1665 weak - C=C stretching alkene tetrasubstituted
1662-1626 medium - C=C stretching alkene disubstituted (cis)
1658-1648 medium - C=C stretching alkene vinylidene
1650-1600 medium - C=C stretching conjugated alkene -
1650-1580 medium - N-H bending amine -
1650-1566 medium - C=C stretching cyclic alkene -
1648-1638 strong - C=C stretching alkene monosubstituted
1620-1610 strong - C=C stretching α,β-unsaturated ketone -
1600-1300 cm-1
1550-1500
1372-1290
strong - N-O stretching nitro compound -
1465 medium - C-H bending alkane methylene group
1450
1375
medium - C-H bending alkane methyl group
1390-1380 medium - C-H bending aldehyde -
1385-1380
1370-1365
medium - C-H bending alkane gem dimethyl
1400-1000 cm-1
1440-1395 medium - O-H bending carboxylic acid -
1420-1330 medium - O-H bending alcohol -
1415-1380
1200-1185
strong - S=O stretching sulfate -
1410-1380
1204-1177
strong - S=O stretching sulfonyl chloride -
1400-1000 strong - C-F stretching fluoro compound -
1390-1310 medium - O-H bending phenol -
1372-1335
1195-1168
strong - S=O stretching sulfonate -
1370-1335
1170-1155
strong - S=O stretching sulfonamide -
1350-1342
1165-1150
strong - S=O stretching sulfonic acid anhydrous
hydrate: 1230-1120
1350-1300
1160-1120
strong - S=O stretching sulfone -
1342-1266 strong - C-N stretching aromatic amine -
1310-1250 strong - C-O stretching aromatic ester -
1275-1200
1075-1020
strong - C-O stretching alkyl aryl ether -
1250-1020 medium - C-N stretching amine -
1225-1200
1075-1020
strong - C-O stretching vinyl ether -
1210-1163 strong - C-O stretching ester -
1205-1124 strong - C-O stretching tertiary alcohol -
1150-1085 strong - C-O stretching aliphatic ether -
1124-1087 strong - C-O stretching secondary alcohol -
1085-1050 strong - C-O stretching primary alcohol -
1070-1030 strong - S=O stretching sulfoxide -
1050-1040 strong broad CO-O-CO stretching anhydride -
1000-650 cm-1
995-985
915-905
strong - C=C bending alkene monosubstituted
980-960 strong - C=C bending alkene disubstituted (trans)
895-885 strong - C=C bending alkene vinylidene
850-550 strong - C-Cl stretching halo compound -
840-790 medium - C=C bending alkene trisubstituted
730-665 strong - C=C bending alkene disubstituted (cis)
690-515 strong - C-Br stretching halo compound -
600-500 strong - C-I stretching halo compound -
900-700 cm-1
880 ± 20
810 ± 20
strong - C-H bending 1,2,4-trisubstituted -
880 ± 20
780 ± 20
(700 ± 20)
strong - C-H bending 1,3-disubstituted -
810 ± 20 strong - C-H bending 1,4-disubstituted or
1,2,3,4-tetrasubstituted
-
780 ± 20
(700 ± 20)
strong - C-H bending 1,2,3-trisubstituted -
755 ± 20 strong - C-H bending 1,2-disubstituted -
750 ± 20
700 ± 20
strong - C-H bending monosubstituted
benzene derivative
-

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Infrared Spectroscopy Absorption Table is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by LibreTexts.

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