Common IR Spectrum Peaks and Their Characteristics

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Last updated 2:01 PM on 9/19/26
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7 Terms

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Alcohols

A LARGE, broad trough far to the left for alcohols and on top of 3000 cm-1 for carboxylic acids.

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C=C or C=N

Small to medium peak at 1600-1700 cm-1.

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C=O (carbonyl)

A BIG pointy peak at 1700+/-50 cm-1.

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C-H's

Big, pointy peaks coming straight down around 3000 cm-1.

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N-H

A sharp peak to the left of 3000 cm-1 (around 3200-3500 cm-1).

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C=N (a nitrile)

Medium-sized peak at ~2200 cm-1.

7
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NO2

Vampire teeth at 1500-1600 cm-1 and 1300-1400 cm-1.