Advanced Organic Chemistry: Carbon-13 NMR spectrum of trimethylamine (CH3)3N

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Interpreting and explaining the Carbon-13 NMR spectrum of N,N-dimethylmethanamine (N,N-dimethylmethylamine, trimethylamine)

[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 propyl methanoate [spectra page updated April 4th 2026 *]

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 C-13 NMR spectroscopy - spectra index

Introductory note on the 13C NMR spectrum of trimethylamine

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

The description does not involve the chemical shift δ spin-spin coupling effects for trimethylamine 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 trimethylamine molecule.

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

13C nmr spectrum of N,N-dimethylmethanamine (trimethylamine) C3H9N (CH3)3N analysis of chemical shifts ppm interpretation of C-13 chemical shifts ppm of N,N-dimethylmethylamine 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 - N,N-dimethylmethanamine (trimethylamine) here.

N,N-dimethylmethanamine, N,N-dimethylmethylamine, trimethylamine, (c) doc b ,(c) doc b

The classification, structure and naming of organic nitrogen compounds

Interpreting the C-13 NMR spectrum of N,N-dimethylmethanamine (trimethylamine)

As you can see from the diagram above there is only one 13C chemical shift line in the C-13 NMR spectrum of N,N-dimethylmethanamine (trimethylamine) indicating only one chemical environment of the 3 carbon atoms of N,N-dimethylmethanamine (trimethylamine).

(CH3)3N

13C chemical shift (a) on the C-13 NMR spectrum diagram for N,N-dimethylmethanamine (trimethylamine).

All three carbon atoms are chemically equivalent to each other because of the symmetry of the trimethylamine molecule.

The carbon-13 NMR spectra provides direct evidence of only one carbon atom environment for the 3 carbon atoms in the N,N-dimethylmethanamine (trimethylamine) molecule, deduced from the presence of only a single 13C NMR chemical shifts (ppm).

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The infrared spectra of N,N-dimethylmethanamine (N,N-dimethylmethylamine, trimethylamine)

The mass spectra of N,N-dimethylmethanamine (N,N-dimethylmethylamine, trimethylamine)

The H-1 NMR spectra of N,N-dimethylmethanamine (N,N-dimethylmethylamine, trimethylamine)

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