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Spectrometry

Infa-red Spectrometry
detects functional groups

a) C=O Carbonyl - approx. 1700cm­1
(1680cm­1 ­ 1750cm­1)
peak is big and strong

b) O­H Carboxylic Acid - approx. 3000cm­1
(2500cm­1 ­ 3300cm­1)
peak is broad - `Big and fat'

Alcohols and Phenols - approx. 3000cm­1
(3230cm­1 ­ 3550cm­1)
peak is broad -…

Page 2

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Ha ­ Part of CH3 joined to another CH3

Hb ­ Part of CH3 joined to another CH3

Hc ­ Part of CH3 joined to a CH2

Hd ­ Part of CH2 joined to two CH3
He ­ Part of CH3 joined to a CH2
Hf ­ Part of CH3…

Page 3

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Spin-Spin Coupling

Each H affects its neighbours
When anything spins it generates a magnetic field
Each H is affected by number of H's on adjacent C's
We have to apply the (n+1) rule
o We first have to count the number of H's on adjacent C's (n)
o Spin-Spin coupling…

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