IR absorptions

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Chemistry

Organic Chemistry

COLLEGE

Last updated 11:02 PM on 9/10/26
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13 Terms

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Primary Amines (-NH)

3300-3500 (sharp, medium intensity, double)

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Alcohols (-OH)

3400-3650 (broad, intense)

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Aromatic rings

1450-1500 (series of medium intensity absorptions)

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C-H alkyne bonds

3300

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C-H alkene bonds

3000-3100 (may be difficult to see)

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C-H alkane bonds

2800-3000 (strong)

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Aldehydes

~1700 (strong), second C-H peak at 2750-2850

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Ketones

~1700 (strong), no noted second peak

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Esters

1735, strong

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Amide

1640-1690 (strong)

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Secondary amine

3100-3500 (medium and sharp, singular)

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Conjugated carbonyl group

1685

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