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Advanced Organic Chemistry: Infrared spectrum of butanone

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Interpreting the infrared absorption spectrum of butanone

Doc Brown's Chemistry Advanced Level Pre-University Chemistry Revision Study Notes UK IB GCE advanced A level organic chemistry students US K12 grade 11 grade 12 organic chemistry courses involving molecular spectroscopy analysing infrared spectra of butanone (2-butanone, butan-2-one)

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Infrared spectroscopy - spectra index

infrared spectrum of butanone wavenumbers cm-1 functional group detection fingerprint pattern identification of 2-butanone butan-2-onean-2-one doc brown's advanced organic chemistry revision notes 

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

Butanone C4H8O,  aldehydes and ketones nomenclature (c) doc b , aldehydes and ketones nomenclature (c) doc b , aldehydes and ketones nomenclature (c) doc b , aldehydes and ketones nomenclature (c) doc b

Interpretation of the infrared spectrum of butanone

The most prominent infrared absorption lines of butanone

The strongest and most characteristic absorption band of butanone 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 butanone molecular structure.


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