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    (Original post by iHeartCookies)
    Just wondering what is an aldehyde doublet on an IR spectrum?

    I've got it written on a benzaldehyde spectrum.. but I have no idea what it is?! I tried googling it.. didn't really come up with much :/

    Thanks in advance
    What wavenumber range are the doublets at? Could those be the aromatic and aldehyde C-H stretches?
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    In generic aldehydes or just benzaldehyde? You shouldn't see a 'doublet' in the C=O region for benzaldehyde :no:
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    Ah the two C-H bands are due to something called 'Fermi resonance' which is something to do with the bending modes and the strecthing modes interacting, but I know nothing more than that :ninja2:
 
 
 
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