Infrared Spectroscopy Absorption Table
- Page ID
- 22645
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)The following table lists infrared spectroscopy absorptions by frequency regions.
| 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 | - |
| 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 | - |
| 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 | weak | - | C-H | bending | aromatic compound | overtone |
|---|
| 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 |
| 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 | - |
| 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 |
| 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 | - |
| 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 | - |
| 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 |
- |