Advanced Organic Chemistry: Infrared spectrum of bromomethane CH3Br

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Interpreting the infrared spectrum of bromomethane (methyl bromide)

[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 & AP honors chemistry courses: Molecular spectroscopy of bromomethane [updated Mar 20th 2026 *]

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 Infrared spectroscopy - spectra index

Introductory note on the infrared spectrum of bromomethane

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

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

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

CH3Br infrared spectrum of bromomethane wavenumbers cm-1 functional group detection fingerprint pattern identification of methyl bromide doc brown's advanced organic chemistry revision notes 

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

Bromomethane, CH3Br (methyl bromide)

The molecular structure and naming of haloalkanes

Interpretation of the infrared spectrum of bromomethane

The most prominent infrared absorption lines of bromomethane

Several moderately strong absorption bands at wavenumbers 2975 to 2845 cm-1 for C-H stretching vibrations - collectively give the impression of strong absorption in the infrared spectrum of bromomethane.

Several strong absorption bands from C-H deformation vibrations at wavenumbers 1470 to 1370 cm-1.

Several strong absorption bands from 750 to 550 cm-1 due to C-Br stretching vibrations of bromomethane.

Note the extra sharpness of the peaks using vapourised bromomethane compared to the broader bands you get with liquid film infrared spectra.

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

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The mass spectrum of bromomethane

The H-1 NMR spectrum of bromomethane

The C-13 NMR spectrum of bromomethane

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