Peak Assignment Table

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Chemistry 361 (v1) – Infra-red Spectrophotometry

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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 O-H N-H C=C C=C C  C C-N C  N C-O C=O NO 2 R 2 SO Alkanes Alkenes Alkynes Aldehydes Aromatic rings 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 R 2 SO 2 Sulfur compounds (sulfone) R 2 SO 3 Sulfur compounds C-Cl Alky Halides 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 1050-1300 1690-1760 1500-1570 1300-1370 Sulfur compounds (sulfoxide) 1050 1330 and 1140 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

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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.

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