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Advanced Organic Chemistry: Infrared spectrum of propanone

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Interpreting the infrared spectrum of propanone (acetone)

Doc Brown's Chemistry Advanced Level Pre-University Chemistry Revision Study Notes for UK IB KS5 A/AS GCE advanced A level organic chemistry students US K12 grade 11 grade 12 organic chemistry courses involving molecular spectroscopy analysing infrared spectra of propanone

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Infrared spectroscopy - spectra index

infrared spectrum of propanone wavenumbers cm-1 functional group detection fingerprint pattern identification of acetone doc brown's advanced organic chemistry revision notes 

Spectra obtained from a liquid film of propanone. The right-hand part of the of the infrared spectrum of propanone, wavenumbers ~1500 to 400 cm-1 is considered the fingerprint region for the identification of propanone and most organic compounds. It is due to a unique set of complex overlapping vibrations of the atoms of the molecule of propanone.

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Interpretation of the infrared spectrum of propanone  (acetone)

The most prominent infrared absorption lines of propanone

The strongest and most characteristic absorption band of propanone is at wavenumbers ~1700 to 1725 cm-1 for the stretching vibrations of the carbonyl group bond C=O.

There are multiple C-H absorptions at wavenumbers ~1215 to 1435 cm-1 and ~3000 cm-1, but non particularly characteristic of ketones.

The absence of other specific functional group bands will show that particular functional group is absent from the propanone molecular structure.

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