2B-3 Infrared Spectroscopy.pdf

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What is it?
1
Chromatography
Separate mixture into components
Comparison to authentic samples
2
3
Spectroscopy
Spectrometry
Identify components
1
Infrared (IR) Spectroscopy
Identification of compounds
Based on molecular vibrations
Stretching and bending of chemical bonds
Energy change match that of IR light
2
Infrared (IR) Spectroscopy
Irradiate a molecule with IR
light of the correct frequency
Molecule starts to vibrate
3
Infrared (IR) Spectroscopy
Stretching frequency depends on
1
2
Masses of atoms involved
Stiffness of the bond
Single
bonds
Double
bonds
Triple
bonds
4
Infrared (IR) Spectroscopy
Double
bonds (stiff)
bonds to
H (light)
Triple bonds
(very stiff)
5

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