infrared spectroscopy: functional groups keywords: infrared, radiation, absorption, spectroscopy

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Infrared spectroscopy: functional groups Keywords: infrared, radiation, absorption, spectroscopy

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Page 1: Infrared spectroscopy: functional groups Keywords: infrared, radiation, absorption, spectroscopy

Infrared spectroscopy:functional groups

Keywords: infrared, radiation, absorption, spectroscopy

Page 2: 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

Page 3: Infrared spectroscopy: functional groups Keywords: infrared, radiation, absorption, spectroscopy

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

Page 4: Infrared spectroscopy: functional groups Keywords: infrared, radiation, absorption, spectroscopy

Alcohols

Page 5: Infrared spectroscopy: functional groups Keywords: infrared, radiation, absorption, spectroscopy

Aldehydes and ketones

Page 6: Infrared spectroscopy: functional groups Keywords: infrared, radiation, absorption, spectroscopy

Carboxylic acids

Page 7: Infrared spectroscopy: functional groups Keywords: infrared, radiation, absorption, spectroscopy

Task:

Page 8: Infrared spectroscopy: functional groups Keywords: infrared, radiation, absorption, spectroscopy

Stretch O-H C-H C=O C-O

Alcohols

Carbonyls

Carboxylics

Page 9: Infrared spectroscopy: functional groups Keywords: infrared, radiation, absorption, spectroscopy
Page 10: Infrared spectroscopy: functional groups Keywords: infrared, radiation, absorption, spectroscopy
Page 11: Infrared spectroscopy: functional groups Keywords: infrared, radiation, absorption, spectroscopy
Page 12: Infrared spectroscopy: functional groups Keywords: infrared, radiation, absorption, spectroscopy
Page 13: Infrared spectroscopy: functional groups Keywords: infrared, radiation, absorption, spectroscopy
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Page 17: Infrared spectroscopy: functional groups Keywords: infrared, radiation, absorption, spectroscopy
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Page 19: Infrared spectroscopy: functional groups Keywords: infrared, radiation, absorption, spectroscopy

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