Advanced Organic Chemistry: Carbon-13 NMR spectrum of 1,2-dibromoethane

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The Carbon-13 NMR 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 C-13 NMR spectra of 1,2-dibromoethane

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C-13 NMR spectroscopy - spectra index

C2H4Br2 BrCH2CH2Br C-13 nmr spectrum of 1,2-dibromoethane analysis of chemical shifts ppm interpretation of 13C chemical shifts ppm of 1,2-dibromoethane C13 13-C nmr doc brown's advanced organic chemistry revision notes 

TMS is the acronym for tetramethylsilane, formula Si(CH3)4, whose 13C atoms are arbitrarily given a chemical shift of 0.0 ppm. This is the 'standard' in 13C NMR spectroscopy and all other 13C resonances, called chemical shifts, are measured with respect to the TMS, and depend on the individual (electronic) chemical environment of the 13C atoms in an organic molecule - 1,2-dibromoethane here.

1,2-dibromoethane,  C2H4Br2,  BrCH2CH2Br2

Interpreting the C-13 NMR spectrum of 1,2-dibromoethane

As you can see from the diagram above there is only one chemical shift line in the C-13 NMR spectrum of 1,2-dibromoethane indicating one chemical environment for the two carbon atoms of 1,2-dibromoethane.

BrCH2CHBr2

1,2-dibromoethane is a symmetrical molecule and the two carbons are in an identical chemical environment.

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