Advanced level pre-university organic chemistry: Infrared spectrum 1,3,5-trimethylbenzene (mesitylene)

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Interpreting the infrared spectrum of 1,3,5-trimethylbenzene (mesitylene)

[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 1,3,5-trimethylbenzene [spectrum page updated Mar 24th 2026 *]

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Introductory note on the infrared spectrum of 1,3,5-trimethylbenzene (mesitylene)

Students and teachers please note my explanation of the infrared spectrum of 1,3,5-trimethylbenzene (mesitylene) is designed for advanced, but pre-university, chemistry courses.

Based in the infrared spectrum diagram for 1,3,5-trimethylbenzene (mesitylene), only some of the most prominent peaks for particular bond vibrations are discussed, particularly if 1,3,5-trimethylbenzene (mesitylene) has a functional group with a particular characteristic wavenumber peak.

The infrared spectrum of 1,3,5-trimethylbenzene (mesitylene) is unique and the whole, or selected wavenumbers, can be used to fingerprint its identity, sometimes analysing a mixture containing 1,3,5-trimethylbenzene (mesitylene) or following its change of concentration in a reaction.

C9H12 infrared spectrum of 1,3,5-trimethylbenzene wavenumbers cm-1 functional group detection fingerprint pattern identification of mesitylene doc brown's advanced organic chemistry revision notes 

Spectra obtained from a liquid film of 1,3,5-trimethylbenzene (mesitylene). The right-hand part of the of the infrared spectrum of 1,3,5-trimethylbenzene (mesitylene), wavenumbers ~1500 to 400 cm-1 is considered the fingerprint region for the identification of 1,3,5-trimethylbenzene (mesitylene) and most organic compounds. It is due to a unique set of complex overlapping vibrations of the atoms of the molecule of 1,3,5-trimethylbenzene (mesitylene).

structural formula 1,3,5-trimethylbenzene mesitylene molecular structure molecular formula C9H12 C6H3(CH3)3

The molecular structure and naming of aromatic compounds

Interpretation of the infrared spectrum of 1,3,5-trimethylbenzene, mesitylene, C6H3(CH3)3

The most prominent infrared absorption lines of 1,3,5-trimethylbenzene (mesitylene)

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.

C=C benzene ring vibrations with peaks close to wavenumbers 1600 and 1500 cm-1.

C-H side-chain alkyl vibrations are observed at wavenumbers 1470 to 1370 cm-1.

Other aryl C-H vibration absorptions occur at wavenumbers 900 to 735 cm-1 characteristic of a 1,3,5-trisubstituted benzene ring.

The absence of other specific functional group bands will show that particular functional group is absent from the 1,3,5-trimethylbenzene (mesitylene) molecular structure.

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The mass spectrum of 1,3,5-trimethylbenzene

The H-1 NMR spectrum of 1,3,5-trimethylbenzene

The C-13 NMR spectrum of 1,3,5-trimethylbenzene

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