Advanced Organic Chemistry: Infrared spectrum of 1,4-dimethylbenzene C6H4(CH3)2

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Interpreting infrared spectrum of 1,4-dimethylbenzene

[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 - analysing the infrared spectrum of 1,4-dimethylbenzene [spectra page updated Mar 16th 2026 *]

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Introductory note on the infrared spectrum of 1,4-dimethylbenzene

Students and teachers please note my explanation of the infrared spectrum of 1,4-dimethylbenzene is designed for advanced, but pre-university, chemistry courses.

Based in the infrared spectrum diagram for 1,4-dimethylbenzene, only some of the most prominent peaks for particular bond vibrations are discussed, particularly if 1,4-dimethylbenzene has a functional group with a particular characteristic wavenumber peak.

The infrared spectrum of 1,4-dimethylbenzene is unique and the whole, or selected wavenumbers, can be used to fingerprint its identity, sometimes analysing a mixture containing 1,4-dimethylbenzene or following its change of concentration in a reaction.

C8H10 infrared spectrum of 1,4-dimethylbenzene wavenumbers cm-1 functional group detection fingerprint pattern identification of para-xylene doc brown's advanced organic chemistry revision notes 

Spectra obtained from a liquid film of 1,4-dimethylbenzene. The right-hand part of the of the infrared spectrum of 1,4-dimethylbenzene, wavenumbers ~1500 to 400 cm-1 is considered the fingerprint region for the identification of 1,4-dimethylbenzene and most organic compounds. It is due to a unique set of complex overlapping vibrations of the atoms of the molecule of 1,4-dimethylbenzene.

1,4-dimethylbenzene , C8H10 , C6H4(CH3)2 , (c) doc b , (c) doc b

The molecular structure and naming of aromatic compounds

Interpretation of the infrared spectrum of 1,4-dimethylbenzene

The most prominent infrared absorption lines of 1,4-dimethylbenzene

Strong absorption at wavenumbers 3080 to 3030 cm-1 due to -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.

Aryl (NOT C=C) benzene ring vibrations with peaks close to wavenumbers 1600 and 1500 cm-1.

There are no other functional groups in 1,4-dimethylbenzene, so there are no other particularly characteristic absorptions (wavenumbers) in its infrared spectrum.

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

Other aryl C-H vibration absorptions occur at wavenumbers 770 to 735 cm-1 characteristic of a disubstituted benzene ring.

The absence of other specific functional group bands will show that particular functional group is absent from the 1,4-dimethylbenzene molecular structure.

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The infrared spectrum of 1,2-dimethylbenzene

The infrared spectrum of 1,3-dimethylbenzene

The mass spectrum of 1,2-dimethylbenzene

The mass spectrum of 1,3-dimethylbenzene

The mass spectrum of 1,4-dimethylbenzene

The H-1 NMR spectrum of 1,2-dimethylbenzene

The H-1 NMR spectrum of 1,3-dimethylbenzene

The H-1 NMR spectrum of 1,4-dimethylbenzene

The C-13 NMR spectrum of 1,2-dimethylbenzene

The C-13 NMR spectrum of 1,3-dimethylbenzene

The C-13 NMR spectrum of 1,4-dimethylbenzene

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