Tabla de absorciones en espectroscopía infrarroja

Solapas principales

Tipo  de compuesto Grupo Absorción (cm-1)     Apariencia Comentarios
Haluros de ácido C=O Tensión 1815-1785 Fuerte  
Alcoholes O-H  Tensión 3700-3584 Media, aguda Libre
 

O-H

Tensión

3550-3200 Fuerte, amplia Con enlace de hidrógeno intermolecular
  O-H Tensión 3200-2700 Débil, amplia Con enlace de hidrógeno intramolecular
  O-H  Flexión 1420-1330 Media  
aldehyde C-H stretching 2830-2695 medium doublet
  C=O stretching 1740-1720 strong  
  C-H bending 1390-1380 medium  
aliphatic ether C-O stretching 1150-1085 strong  
aliphatic ketone C=O stretching 1725-1705 strong or cyclohexanone or cyclopentenone
aliphatic primary amine N-H stretching 3400-3300 medium  
alkane C-H stretching 3000-2840 medium  
  C-H bending 1465 medium methylene group
  C-H bending 1450 medium methyl group
  C-H bending 1385-1380 medium gem dimethyl
  C-H stretching 3100-3000 medium  
  C=C stretching 1678-1668 weak disubstituted (trans)
  C=C stretching 1675-1665 weak trisubstituted
  C=C stretching 1675-1665 weak tetrasubstituted
  C=C stretching 1662-1626 medium disubstituted (cis)
  C=C stretching 1658-1648 medium vinylidene
  C=C stretching 1648-1638 strong monosubstituted
  C=C bending 995-985 strong monosubstituted
  C=C bending 980-960 strong disubstituted (trans)
  C=C bending 895-885 strong vinylidene
  C=C bending 840-790 medium trisubstituted
  C=C bending 730-665 strong disubstituted (cis)
alkyl aryl ether C-O stretching 1275-1200 strong  
alkyne C-H stretching 3333-3267 strong, sharp  
  CΞC stretching 2260-2190 weak disubstituted
  CΞC stretching 2140-2100 weak monosubstituted
allene C=C=C stretching 2000-1900 medium  
amine N-H bending 1650-1580 medium  
  C-N stretching 1250-1020 medium  
amine salt N-H stretching 3000-2800 strong, broad  
anhydride C=O stretching 1818 strong  
  CO-O-CO stretching 1050-1040 strong, broad  
aromatic amine C-N stretching 1342-1266 strong  
aromatic compound C-H bending 2000-1650 weak overtone
aromatic ester C-O stretching 1310-1250 strong  
azide N=N=N stretching 2160-2120 strong  
benzene derivative   700 ± 20    
carbodiimide N=C=N stretching 2145-2120 strong  
carbon dioxide O=C=O stretching 2349 strong  
carboxylic acid O-H stretching 3300-2500 strong, broad usually centered on 3000 cm-1
  C=O stretching 1760 strong monomer
  C=O stretching 1720-1706 strong dimer
  O-H bending 1440-1395 medium  
conjugated acid C=O stretching 1710-1680 strong dimer
conjugated acid halide C=O stretching 1800-1770 strong  
conjugated aldehyde C=O stretching 1710-1685 strong  
conjugated alkene C=C stretching 1650-1600 medium  
conjugated anhydride C=O stretching 1775 strong  
conjugated ketone C=O stretching 1685-1666 strong  
cyclic alkene C=C stretching 1650-1566 medium  
cyclopentanone C=O stretching 1745 strong  
ester C-O stretching 1210-1163 strong  
esters C=O stretching 1750-1735 strong 6-membered lactone
fluoro compound C-F stretching 1400-1000 strong  
halo compound C-Cl stretching 850-550 strong  
  C-Br stretching 690-515 strong  
  C-I stretching 600-500 strong  
imine / oxime C=N stretching 1690-1640 medium  
isocyanate N=C=O stretching 2275-2250 strong, broad  
isothiocyanate N=C=S stretching 2140-1990 strong  
ketene C=C=O stretching 2150    
ketenimine C=C=N stretching 2000    
monosubstituted C-H bending 750 ± 20 strong  
nitrile CΞN stretching 2260-2222 weak  
nitro compound N-O stretching 1550-1500 strong  
none   3330-3250    
none   1870-1540    
none   1750    
none   1720    
none   1372-1290    
none   1375    
none   1370-1365    
none   1200-1185    
none   1204-1177    
none   1195-1168    
none   1170-1155    
none   1165-1150   hydrate: 1230-1120
none   1160-1120    
none   1075-1020    
none   1075-1020    
none   915-905    
none   810 ± 20    
none   780 ± 20    
none   (700 ± 20)    
none   (700 ± 20)    
phenol O-H bending 1390-1310 medium  
primary alcohol C-O stretching 1085-1050 strong  
primary amide C=O stretching 1690 strong free (associated: 1650)
  N-H stretching 3500 medium  
secondary alcohol C-O stretching 1124-1087 strong  
secondary amide C=O stretching 1680 strong free (associated: 1640)
secondary amine N-H stretching 3350-3310 medium  
sulfate S=O stretching 1415-1380 strong  
sulfonamide S=O stretching 1370-1335 strong  
sulfonate S=O stretching 1372-1335 strong  
sulfone S=O stretching 1350-1300 strong  
sulfonic acid S=O stretching 1350-1342 strong anhydrous
sulfonyl chloride S=O stretching 1410-1380 strong  
sulfoxide S=O stretching 1070-1030 strong  
tertiary alcohol C-O stretching 1205-1124 strong  
tertiary amide C=O stretching 1680 strong free (associated: 1630)
thiocyanate S-CΞN stretching 2175-2140 strong  
thiol S-H stretching 2600-2550 weak  
vinyl / phenyl ester C=O stretching 1770-1780 strong  
vinyl ether C-O stretching 1225-1200 strong  
α,β-unsaturated ester C=O stretching 1730-1715 strong or formates
α,β-unsaturated ketone C=C stretching 1620-1610 strong  
δ-lactam C=O stretching 1650 strong γ: 1750-1700 β: 1760-1730
δ-lactone C=O stretching 1750-1735 strong γ: 1770
1,2,3,4-tetrasubstituted        
1,2,3-trisubstituted C-H bending 780 ± 20 strong  
  C-H bending 880 ± 20 strong  
1,2-disubstituted C-H bending 755 ± 20 strong  
  C-H bending 880 ± 20 strong  
1,4-disubstituted or C-H bending 810 ± 20 strong