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Advanced Organic Chemistry: Carbon-13 NMR spectrum of methylamine

Interpreting the Carbon-13 NMR spectrum of methylamine

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 methylamine

13C nmr spectrum of methylamine CH5N CH3NH2 analysis of chemical shifts ppm interpretation of C-13 chemical shifts ppm of methylamine 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 - methylamine here.

Methylamine  CH5N   (c) doc b   (c) doc b   (c) doc b   (c) doc b

Interpreting the C-13 NMR spectrum of methylamine

As you can see from the diagram above there is only one chemical shift line in the C-13 NMR spectrum of methylamine indicating only one chemical environments of the carbon atom of methylamine.

CH3NH2

13C chemical shift (a) on the C-13 NMR spectrum diagram for methylamine.

The carbon-13 NMR spectra provides direct evidence of only one carbon atom environments for the carbon atom of the methylamine molecule, deduced from the presence of only one 13C NMR chemical shift (ppm).


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