infrared spectroscopy: functional groups keywords: infrared, radiation, absorption, spectroscopy
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Infrared spectroscopy:functional groups
Keywords: infrared, radiation, absorption, spectroscopy
• Identify, using C=O and O–H absorptions, an alcohol, an aldehyde or ketone and a carboxylic acid.
Learning objective
The information generated from an infrared spectrum can be used to identify the functional groups in a molecule using a reference data sheet.
You will need to identify the presence of these functional groups:• Alcohols Hydroxyl O-H 3200-3550• Aldehydes + ketones Carbonyl C=O 1640-1750• Carboxylic acid Carboxyl C-O 1000-1300
C=O 1640-1750O-H 2500-3300
• Organic compounds C-H ~3000
Alcohols
Aldehydes and ketones
Carboxylic acids
Task:
Stretch O-H C-H C=O C-O
Alcohols
Carbonyls
Carboxylics
Stretch O-H
2500-3300
C-H
2850-3100
C=O
1840-1750
C-O
1000-1300
Alcohols 3000-3300
Carbonyls Carboxylic
s
Very Broad
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