Advanced Organic Chemistry: Infrared spectrum of ethylbenzene  C6H5CH2CH3

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Interpreting and explaining the infrared spectrum of ethylbenzene

[Author © Dr Phil Brown PhD: Doc Brown's advanced level organic chemistry exam revision notes suitable for students of UK A level chemistry courses & US K12 grade 11, grade 12 and AP honors chemistry courses: Molecular spectroscopy analysis of ethylbenzene [spectra page updated Mar 23rd 2026 *]

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 Infrared spectroscopy - spectra index

Introductory note on the infrared spectrum of ethylbenzene

Students and teachers please note my explanation of the infrared spectrum of ethylbenzene is designed for advanced, but pre-university, chemistry courses.

Based in the infrared spectrum diagram for ethylbenzene, only some of the most prominent peaks for particular bond vibrations are discussed, particularly if ethylbenzene has a functional group with a particular characteristic wavenumber peak.

The infrared spectrum of ethylbenzene is unique and the whole, or selected wavenumbers, can be used to fingerprint its identity, sometimes analysing a mixture containing ethylbenzene or following its change of concentration in a reaction.

C8H10 infrared spectrum of ethylbenzene wavenumbers cm-1 functional group detection fingerprint pattern identification of ethylbenzene doc brown's advanced organic chemistry revision notes 

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

Ethylbenzene, C8H10 , C6H5CH2CH3 , (c) doc b , (c) doc b

The molecular structure and naming of aromatic compounds

Interpretation of the infrared spectrum of ethylbenzene

The most prominent infrared absorption lines of ethylbenzene

Strong absorption at wavenumbers 3080 to 3030 cm-1 due to =C-H aryl C-H stretching vibrations.

Strong C-H stretching vibrations from the alkyl groups (CH2 and CH3) at wavenumbers 2975 to 2845 cm-1.

benzene ring vibrations with peaks close to wavenumbers 1600 and 1500 cm-1 and these values are lower than what you would expects for a full C=C double bond.

The bond order of C=C in alkenes is 2.0, in the aromatic it is only 1.5.

Other aryl C-H vibration absorptions occur at wavenumbers 770 to 690 cm-1 characteristic of a monosubstituted benzene ring.

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

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The mass spectrum of ethylbenzene

The H-1 NMR spectrum of ethylbenzene

The C-13 NMR spectrum of ethylbenzene

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