Advanced Organic Chemistry: The 13C NMR spectrum of methylamine (methanamine) CH3NH2

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Interpreting and explaining the Carbon-13 NMR spectrum of methylamine

[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 spectroscopy - analysing the 13C NMR spectra of methylamine (methanamine) [spectra page updated April 4th 2026 *]

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 C-13 NMR spectroscopy - spectra index

Introductory note on the 13C NMR spectrum of methanamine (methylamine)

Students and teachers please note that my explanation of the carbon-13 NMR spectrum of methanamine (methylamine) is designed for advanced, but pre-university, chemistry courses.

The description does not involve the chemical shift δ spin-spin coupling effects for methanamine (methylamine) and the relative size of the carbon-13 NMR shifts does not give the ratio of the carbon atoms in the different non-equivalent chemical environments of the methanamine (methylamine) molecule.

The most common solvent used for investigating the 13C NMR spectrum of compounds like methanamine (methylamine), is CDCl3 and other deuterated solvents.

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

The classification, structure and naming of organic nitrogen compounds

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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