IR + NMR Spectroscopy Frequencies

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Jude Matthews

Last updated 8:50 PM on 9/28/26
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21 Terms

1
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C=C (isolated)

1640-1680cm⁻¹

<p>1640-1680cm⁻¹ </p>
2
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C=C (aromatic)

~1600cm⁻¹ (Only will show if not symmetrical)

3
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C-H sp3

2800-3000 cm⁻¹

<p>2800-3000 cm⁻¹</p>
4
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C-H sp2 C

3000-3100 cm⁻¹

<p>3000-3100 cm⁻¹ </p>
5
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C-H sp C

3300 cm⁻¹ (Sharp)

<p>3300 cm⁻¹ (Sharp) </p>
6
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C≡C

<2200cm⁻¹ (Only will show if not symmetrical)

<p>&lt;2200cm⁻¹ (Only will show if not symmetrical)</p>
7
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OH

~3300cm⁻¹ (Broad and rounded tip)

<p>~3300cm⁻¹ (Broad and rounded tip)</p>
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Primary NH

~3300cm⁻¹ (Broad, two sharp spike)

<p>~3300cm⁻¹ (Broad, two sharp spike)</p>
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Secondary NH

~3300cm⁻¹ (Broad, one sharp spikes)

10
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Tertiary Amine

No reading, no NH bond.

11
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General Carbonyl (C=O)

Strong peak around ~1710cm⁻¹

12
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Ketone

1710cm⁻¹

<p>1710cm⁻¹ </p>
13
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Aldehyde

1725cm⁻¹ w C-H stretching

<p>1725cm⁻¹ w C-H stretching</p>
14
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Organic Acids

1710cm⁻¹ w/ OH bump

<p>1710cm⁻¹ w/ OH bump </p>
15
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Conjugated Carbonyl (resonance)

1685cm⁻¹

<p>1685cm⁻¹ </p>
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2.1 (NMR)

Methyl Ketone

<p>Methyl Ketone</p>
17
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2.5 (NMR)

Acetylenic

<p>Acetylenic</p>
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3-4 (NMR)

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19
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5-6 (NMR)

Vinyl

<p>Vinyl</p>
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7-8 (NMR)

Aromatic

<p>Aromatic</p>
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9-10 (NMR)

Aldehyde

<p>Aldehyde</p>