IR Spectroscopy Common Absorptions
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Last updated 2:13 PM on 8/29/25
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12 Terms
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Aromatic C-C
Characteristic absorption peaks around 1500-1600 cm⁻¹.
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C=O
Absorption peak near 1710 cm⁻¹, shifts for esters.
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O-H (alcohol)
Broad peak around 3300 cm⁻¹, smooth.
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N-H
One peak for -NH, two for -NH₂ around 3300 cm⁻¹.
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C=C
Absorption typically observed near 1650 cm⁻¹.
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C-H (aldehyde)
Two peaks at 2710 and 2810 cm⁻¹.
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O-H (acid)
Very broad peak in the range of 2500-3500 cm⁻¹.
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C (triple) C
2100 - 2300
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C (triple) N
2100 - 2300
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Sp3 C-H
Just right of 3000
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Sp2 C-H
Just left of 3000 cm-1
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Sp C-H
3300
Note 
Flashcards (178)