Infrared Spectroscopy

Infrared Spectroscopy - Analytical Chemistry Chromatography...

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• Chromatography (Separations) • Mass Spectrometry Infrared (IR) Spectroscopy • Nuclear Magnetic Resonance (NMR) Spectroscopy • X-ray Crystallography (visual solid state molecular structure) Analytical Chemistry
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The Electromagnetic Spectrum
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What insights are we hoping to gain? • Presence/Absence of Functional Groups Infrared (IR) Spectroscopy
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Molecular Vibrations
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The fingerprint region The functional group region
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C H C H C C H O C H Absorbs at (cm -1 ): 2950-2850 3150-3000 3350-3300 2900-2700 (2 bands) More s-character causes the bond lengths to shorten (a more spherical atomic orbital on carbon is being shared) – this leads to a stronger C–H bond as seen in the IR absorbances above. Carbon-Hydrogen (C–H) Bonds
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N H N H H O H 3500-3100 (2 bands) broad, may be weak 3500-3100 (1 band) broad, may be weak 3550-3200 broad, usually strong O O H 3500-2500 very broad, strong Absorbs at (cm -1 ): The broadened peaks are due to hydrogen bonding . As a hydrogen bonding network develops,
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This note was uploaded on 02/09/2010 for the course CH CH242 taught by Professor Katz during the Spring '10 term at Colby.

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Infrared Spectroscopy - Analytical Chemistry Chromatography...

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