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IR Absorbances of Common Functional Groups
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IR Absorbances of Common Functional Groups
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The infrared spectrum of benzyl alcohol displays a broad, hydrogen-bonded 
OH stretching band in the region 
3400 cm
, a sharp unsaturated (sp
) CH stretch at about 3010 cm and a saturated (sp
) CH stretch at about 2900 cm; these bands are typical for alcohols and for aromatic compounds containing some saturated carbon. Acetylene (ethyne) displays a typical terminal alkyne CH stretch, as shown in the second panel.
Saturated and unsaturated CH bands also shown clearly in the spectrum of vinyl acetate (ethenyl ethanoate). This compound also shows a typical ester carbonyl at 1700 cm and a nice example of a carbon-carbon double bond stretch at about 1500 cm. Both of these bands are shifted to slightly lower wave numbers than are typically observed (by about 50 cm) by conjugation involving the vinyl ester group.
Click here to view an IR correlation table.
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Copyright 1996, Paul R. Young, University of Illinois at Chicago, All Rights Reserved