Advanced Organic Chemistry: Infrared spectrum of 1,2-dichloroethane ClCH2CH2Cl

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Interpreting and explaining and explaining the infrared spectrum of 1,2-dichloroethane

[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 spectrometry - analysing the infrared spectra of 1,2-dichloroethane [spectra page updated April 3rd 2026 *]

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Introductory note on the infrared spectrum of 1,2-dichloroethane

Students and teachers please note my explanation of the infrared spectrum of 1,2-dichloroethane is designed for advanced, but pre-university, chemistry courses.

Based in the infrared spectrum diagram for 1,2-dichloroethane, only some of the most prominent peaks for particular bond vibrations are discussed, particularly if 1,2-dichloroethane has a functional group with a particular characteristic wavenumber peak.

The infrared spectrum of 1,2-dichloroethane is unique and the whole, or selected wavenumbers, can be used to fingerprint its identity, sometimes analysing a mixture containing 1,2-dichloroethane or following its change of concentration in a reaction.

infrared spectrum of 1,2-dichloroethane C2H4Cl2 CH2ClCH2Cl wavenumbers cm-1 functional group detection fingerprint pattern identification of 1,2-dichloroethane doc brown's advanced organic chemistry revision notes 

Spectra obtained from a liquid film of 1,2-dichloroethane. The right-hand part of the of the infrared spectrum of 1,2-dichloroethane, wavenumbers ~1500 to 400 cm-1 is considered the fingerprint region for the identification of 1,2-dichloroethane and most organic compounds. It is due to a unique set of complex overlapping vibrations of the atoms of the molecule of 1,2-dichloroethane.

1,2-dichloroethane,  C2H4Cl2,  ClCH2-CH2Cl

The molecular structure and naming of haloalkanes

Interpretation of the infrared spectrum of 1,2-dichloroethane

The most prominent infrared absorption lines of 1,2-dichloroethane

As with any molecule with an alkyl group in the molecule, like 1,2-dichloroethane, C-H stretching vibrations occur at wavenumbers 2975 to 2845 cm-1 and 1470 to 1340 cm-1.

For 1,2-dichloroethane, there are series of C-Cl vibrations bands of various modes at wavenumbers 800 to 580 cm-1.

The absence of other specific functional group bands will show that a particular functional group is absent from the 1,2-dichloroethane molecular structure.

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Links associated with 1,2-dichloroethane

The mass spectrum of 1,2-dichloroethane

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

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

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