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Infrared spectroscopy: functional groups Keywords: infrared, radiation, absorption, spectroscopy
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Identify, using C=O and O–H absorptions, an alcohol, an aldehyde or ketone and a carboxylic acid. Learning objective
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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: AlcoholsHydroxylO-H3200-3550 Aldehydes + ketonesCarbonylC=O1640-1750 Carboxylic acidCarboxylC-O1000-1300 C=O1640-1750 O-H2500-3300 Organic compoundsC-H~3000
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Alcohols
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Aldehydes and ketones
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Carboxylic acids
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Task:
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StretchO-HC-HC=OC-O A lcohols C arbonyls C arboxylics
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Stretch O-H 2500-3300 C-H 2850-3100 C=O 1840-1750 C-O 1000-1300 A lcohols 3000-3300 C arbonyls C arboxylics Very Broad
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