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Some characteristic absorption frequencies in IR spectroscopy

[ "article:topic", "Lower Division", "Organic", "Author tag:Soderberg", "authorname:soderberg", "authorname:soderbergt", "showtoc:no" ]
  • Page ID
    1100
    • Contributed by

    Bond type

    Frequency (cm-1)

    C-H alkane

    2950 – 2850

    C-H alkene

    3080 – 3020

    C-H aldehyde

    ~2900

    C-H alkyne

    ~3300

    alkyne triple bond

    2250 – 2100 (s)

    alkene double bond

    1680 - 1620 (s)

    carbonyl, ketone

    1725 – 1700 (s)

    carbonyl, aldehyde

    1740 – 1720 (s)

    carbonyl, ester

    1750 – 1730 (s)

    carbonyl, acid

    1725 – 1700 (s)

    carbonyl, amide

    1690 – 1650 (s)

    O-H, alcohol

    3600 – 3200 (s, broad)

    O-H, acid

    3000 – 2500 (s, broad)

    C-O, alcohol, ester, ether

    1300 - 1000

     

    s = strong absorbance

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    Contributors

    • Organic Chemistry With a Biological EmphasisTim Soderberg (University of Minnesota, Morris)