Chemistry 361 (v1) – Infra-red Spectrophotometry Page 3
FOR EACH OF YOUR SPECTRA COMPLETE THIS PEAK ASSIGNMENT TABLE:
Bond Type of Compound Frequency Range, cm -1
Is band definitely present or absent
Frequency in spectrum , cm
-1
C-H
C-H
C-H
C-H
C-H
Alkanes
Alkenes
Alkynes
Aldehydes
Aromatic rings
O-H Monomeric alcohols, phenols
Hydrogen-bonded alcohols, phenols
Monomeric carboxylic acids
Hydrogen-bonded carboxylic acids
N-H Amines, amides
C=C Alkenes
C=C Aromatic rings
C

C Alkynes
C-N Amines, amides
C

N Nitriles
2850-2970 asym and sym stretch for CH
3
~1380 CH bend in CH
3
~ 1450 Scissor for CH
2
3010-3095 asym and sym stretch for CH
2
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
C-O Alcohols, ethers, carboxylic acids, esters
C=O Aldehydes, ketones, carboxylic acids, esters
NO
2
Nitro compounds
R
2
SO Sulfur compounds (sulfoxide) 1050
R
2
SO
2
Sulfur compounds (sulfone) 1330 and 1140
R
2
SO
3
Sulfur compounds
C-Cl Alky Halides
1050-1300
1690-1760
1500-1570
1300-1370
1380 and 1170
850-550
C-F Alky Halides
Overtones
1000-1400
Note: All frequencies given are for stretching mode(s) unless indicated.

Chemistry 361 (v1) – Infra-red Spectrophotometry Page 4
Add any additional Bonds if you need to. (C-Cl for CHCl
3
)
Copies of this table are under the IR section on the website. Print out and use for your write up.