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Click the mouse on the spectrum to review selected absorbance bands...
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3400-3200 cm-1: O-H and NH stretch; typically broad; very intense...
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3100 cm-1: Unsaturated CH stretch; typically sharp; variable intensity...
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2900 cm-1: Saturated CH stretch; typically sharp; variable intensity...
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2750 cm-1: Aldehydic CH stretch; typically sharp, variable intensity...
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2550 cm-1: Thiol SH stretch; typically sharp; variable intensity...
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2400-2200 cm-1: Triple bond stretch; typically sharp for CN, weak for alkynes...
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1800-1650 cm-1: Carbonyl stretch; typically broad and intense...
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1640 cm-1: NH bend-amide II; typically broad and medium...
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1600-1400 cm-1: Double bond stretch; sharp; variable; up to four peaks for arenes
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1200-1050 cm-1: Carbon-Oxygen stretch; typically broad and intense...
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1750 cm-1: This peak is unusually high for an alkene, but is too weak to be a carbonyl (also note that the molecule does not contain oxygen); it most likely represents a sterically hindered alkene...
@1997 Brooks/Cole Publishing Company