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Advanced Organic Chemistry: Infrared spectrum of benzaldehyde

Interpreting the infrared spectrum of benzaldehyde

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 benzaldehyde

C7H6O C6H5CHO infrared spectrum of benzaldehyde wavenumbers cm-1 functional group detection fingerprint pattern identification of benzaldehyde doc brown's advanced organic chemistry revision notes 

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

 benzaldehyde C7H6O, C6H5CHO , (c) doc b , (c) doc b 

Interpretation of the infrared spectrum of benzaldehyde

The most prominent infrared absorption lines of benzaldehyde

At wavenumbers 3000 to 3080 cm-1 you get the C-H vibrations from the benzene ring.

At wavenumbers 2650 to 2880 cm-1 you get the C-H vibration absorptions from the aldehyde group.

At ~1700 cm-1 you get the characteristic C=O stretching vibrations of the carbonyl group.

Between wavenumbers 1440 and 1625 cm-1 you get several absorption bands between due to C=C vibrations in the benzene ring.

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


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