Download peak assignment table

Chemistry 361 (v1) – Infra-red Spectrophotometry
Page 3
FOR EACH OF YOUR SPECTRA COMPLETE THIS PEAK ASSIGNMENT TABLE:
Bond
Type of Compound
C-H
Alkanes
C-H
Alkenes
C-H
C-H
Alkynes
Aldehydes
C-H
Aromatic rings
O-H
Monomeric alcohols, phenols
Hydrogen-bonded alcohols,
phenols
Monomeric carboxylic acids
Hydrogen-bonded carboxylic
acids
Amines, amides
Alkenes
Aromatic rings
Alkynes
Amines, amides
Nitriles
Alcohols, ethers, carboxylic
acids, esters
Aldehydes, ketones,
carboxylic acids, esters
Nitro compounds
N-H
C=C
C=C
CC
C-N
CN
C-O
C=O
NO2
R2SO
R2SO2
R2SO3
C-Cl
C-F
Frequency Range, cm
-1
Is band
definitely
present or absent
2850-2970 asym and sym
stretch for CH3
~1380 CH bend in CH3
~ 1450 Scissor for CH2
3010-3095 asym and sym
stretch for CH2
675-995 Out-of-plane
bend
3300 stretch
2750 + 2850
Fermi doublet
3010-3100 stretch
690-900 Out-of-plane
bend
3590-3650
3200-3600
3500-3650
2500-2700
3300-3500
1610-1680
1500-1600
2100-2260
1180-1360
2210-2280
1050-1300
1690-1760
1500-1570
1300-1370
1050
1330 and 1140
1380 and 1170
850-550
1000-1400
Sulfur compounds (sulfoxide)
Sulfur compounds (sulfone)
Sulfur compounds
Alky Halides
Alky Halides
Overtones
Note: All frequencies given are for stretching mode(s) unless indicated.
Frequency in
spectrum , cm-1
Chemistry 361 (v1) – Infra-red Spectrophotometry
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Add any additional Bonds if you need to.
(C-Cl for CHCl3)
Copies of this table are under the IR section on the website. Print out and use for your write up.