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IR Spectroscopy + Triple Bonds = Headache...

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    As part of a course assignment I have to match an IR Spectroscopy reading with a molecule, but I'm having a bit of trouble with one of them.

    One is an alkyne attached to benzene, and the other is a nitrile attached to a benzene. I've had a look in a few text books and websites, but none of them really give a good explanation of how to tell a
    alkyne or a nitrile group apart, just that they show up in the same region. :/

    I'd be really grateful if someone could explain to me what sort of differences would show up for each.
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    It's been a while since you posted and nobody's replied yet...maybe you should check out MarkedbyTeachers.com, TSR's sister site. It has the largest library of essays in the UK.

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    (Original post by fudgestix)
    As part of a course assignment I have to match an IR Spectroscopy reading with a molecule, but I'm having a bit of trouble with one of them.

    One is an alkyne attached to benzene, and the other is a nitrile attached to a benzene. I've had a look in a few text books and websites, but none of them really give a good explanation of how to tell a
    alkyne or a nitrile group apart, just that they show up in the same region. :/

    I'd be really grateful if someone could explain to me what sort of differences would show up for each.
    Try and read up on the chemical shifts of these since a nitrile group is more electron withdrawing than a simple alkyne.
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    benzonitrile - http://riodb01.ibase.aist.go.jp/sdbs...064&sdbsno=669

    phenylacetylene - http://riodb01.ibase.aist.go.jp/sdbs...79&sdbsno=1444

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Updated: October 2, 2009
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