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Advanced Organic Chemistry: Infrared spectrum of 1,2-dibromoethane

Interpreting the infrared spectrum of 1,2-dibromoethane

Doc Brown's Chemistry Advanced Level Pre-University Chemistry Revision Study Notes for UK IB KS5 A/AS GCE advanced A level organic chemistry students US K12 grade 11 grade 12 organic chemistry courses involving molecular spectroscopy analysing infrared spectra of 1,2-dibromoethane

C2H4Br2 BrCH2CH2Br infrared spectrum of 1,2-dibromoethane wavenumbers cm-1 functional group detection fingerprint pattern identification of 1,2-dibromoethane doc brown's advanced organic chemistry revision notes 

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

1,2-dibromoethaneC2H4Br2 BrCH2CH2Br2

Interpretation of the infrared spectrum of 1,2-dibromoethane

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

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 1,2-dibromoethane.

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

Several strong absorption bands from 780 to 580 cm-1 due to C-Cl stretching vibrations of 1,2-dibromoethane.

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


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