Organic Chemistry IR Spectroscopy Trends
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Last updated 12:11 AM on 3/5/25
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21 Terms
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C-C Alkane
3000 onwards
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C=C Alkene
Vibration at 1600-1700; stretch around 3080
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C≡C Alkyne
2100; ≡‒H @ 3300
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C=O
1705-1740
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Aldehyde (H-C=O)
2700-2800
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N-H
3200-3600
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Primary amine
2 peaks
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Secondary amine
1 peak
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Amide (NH2-C=O)
C=O @ 1710
N-H @ 3100-3500
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OH
~3500 broad
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Conjugation does what
Lowers wavenumber
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Greater bond polarity means…
Stronger IR signal
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2nd degree amine
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Alcohol
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Amide
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Carboxylic Acid
17
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Aldehyde
18
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Alcohol
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Secondary amine
20
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Ketone
21
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Note 
Flashcards (35)