Organic Chemistry IR Spectroscopy Trends

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21 Terms

1
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C-C Alkane

3000 onwards

2
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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

10
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OH

~3500 broad

11
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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

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Aldehyde

18
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Alcohol

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Secondary amine

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Ketone

21
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