Infrared Spectroscopy

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Infrared Spectroscopy
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Presentation transcript:

Infrared Spectroscopy

Analytical Chemistry • Chromatography (Separations) • Mass Spectrometry • Infrared (IR) Spectroscopy • Nuclear Magnetic Resonance (NMR) Spectroscopy • X-ray Crystallography (visual solid state molecular structure)

The Electromagnetic Spectrum

Infrared (IR) Spectroscopy What insights are we hoping to gain? • Presence/Absence of Functional Groups

Molecular Vibrations

The functional group region The fingerprint region

Carbon-Hydrogen (C–H) Bonds

Heteroatom-Hydrogen (X–H) Bonds

Other Single Bonds

Carbon-Carbon Bonds

Double Bonds

Carbonyl Stretching Frequencies

Effect of Conjugation

Some Examples: Ethyl Benzene

Some Examples: Molecular Ion = 84

Some Examples: 2-Methyl-1-Pentene

Some Examples: Molecular Ion = 106

Some Examples: Benzaldehyde

Some Examples: Molecular Ion = 56

Some Examples: Propargyl Alcohol

Some Examples: Molecular Ion = 148

Some Examples: 1-Phenylbutan-2-one

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