Advanced Organic Chemistry: 1H NMR spectrum of trimethylamine (CH3)3N

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Interpreting and explaining the H-1 hydrogen-1 (proton) 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 1H NMR spectra of propyl methanoate [spectra page updated April 4th 2026 *]

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 H-1 proton NMR spectroscopy - spectra index

Introductory note on the 1H NMR spectra of trimethylamine

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

The chemical shift δ splitting pattern effects for trimethylamine are confined to a proton spin-spin coupling effects analysed using the n+1 rule for adjacent non-equivalent proton fields (n is the number of neighbouring protons in a non-equivalent different chemical environment for the trimethylamine molecule).

It is assumed that the integrated intensities of the δ chemical shifts give the ratio of the protons in the different non-equivalent chemical environments of the trimethylamine molecule.

The most common solvent used for investigating the 1H NMR spectrum of compounds like trimethylamine, is CDCl3 and other deuterated solvents to avoid confusion with a 1H NMR signal, 2D (2H) has a different chemical shift.

1H proton nmr spectrum of N,N-dimethylmethanamine (trimethylamine) low/high resolution diagrams C3H9N (CH3)3N analysis interpretation of chemical shifts ppm spin spin line splitting diagram H1 H-1 nmr for N,N-dimethylmethylamine explaining spin-spin coupling for line splitting doc brown's advanced organic chemistry revision notes

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

The chemical shifts quoted in ppm on the diagram of the H-1 NMR spectrum of N,N-dimethylmethanamine (trimethylamine) represent the peaks of the intensity of the chemical shifts of (which are often groups of split lines at high resolution) AND the relative integrated areas under the peaks gives you the ratio of protons in the different chemical environments of the N,N-dimethylmethanamine (trimethylamine) molecule.

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

The classification, structure and naming of organic nitrogen compounds

Interpreting the H-1 NMR spectrum of N,N-dimethylmethanamine (trimethylamine)

In terms of spin-spin coupling from the possible proton magnetic orientations, for N,N-dimethylmethanamine (trimethylamine) I have only considered the interactions of non-equivalent protons on adjacent carbon atoms, but this doesn't apply to trimethylamine.

All the hydrogen atoms (protons) of N,N-dimethylmethanamine (trimethylamine) occupy the same chemical environment so that the low/high resolution NMR spectra will only show one principal peak, just one 1H chemical shift at 2.12 ppm (diagram above for N,N-dimethylmethanamine (trimethylamine)) for all 9 protons of the three methyl groups.

(CH3)3N

All 9 hydrogen atoms of the three methyl groups are chemically equivalent to each other because of the symmetry of the trimethylamine molecule - no need for the n+1 rule!

The splitting pattern from proton spin-spin coupling effects is analysed using the n+1 rule for adjacent non-equivalent proton fields (n is the number of neighbouring protons in a non-equivalent different chemical environment) and applied to the 1H NMR spectrum of trimethylamine.
Number of directly adjacent protons 1H causing splitting Splitting pattern produced from the n+1 rule on spin-spin coupling and the theoretical ratio of line intensities
0 means no splitting             1            
1 creates a doublet           1   1          
2 creates a triplet         1   2   1        
3 creates a quartet       1   3   3   1      
4 creates a quintet     1   4   6   4   1    
5 creates a sextet   1   5   10   10   5   1  
6 creates a septet 1   6   15   20   15   6   1

Key words & phrases: isomer of C3H9N (CH3)3N N(CH3)3 Interpreting the proton H-1 NMR spectra of N,N-dimethylmethanamine (trimethylamine), low resolution & high resolution proton nmr spectra of N,N-dimethylmethanamine (trimethylamine), H-1 nmr spectrum of N,N-dimethylmethanamine (trimethylamine), understanding the hydrogen-1 nmr spectrum of N,N-dimethylmethanamine (trimethylamine), explaining the line splitting patterns from spin-spin coupling  in the high resolution H-1 nmr spectra of N,N-dimethylmethanamine (trimethylamine), revising the H-1 nmr spectrum of N,N-dimethylmethanamine (trimethylamine), proton nmr of N,N-dimethylmethanamine (trimethylamine), ppm chemical shifts of the H-1 nmr spectrum of N,N-dimethylmethanamine (trimethylamine), explaining and analyzing spin spin line splitting in the H-1 nmr spectrum, how to construct the diagram of the H-1 nmr spectrum of N,N-dimethylmethanamine (trimethylamine), how to work out the number of chemically different protons in the structure of the N,N-dimethylmethanamine (trimethylamine) organic molecule, how to analyse the chemical shifts in the hydrogen-1 H-1 proton NMR spectrum of N,N-dimethylmethanamine (trimethylamine) using the n+1 rule to explain the spin - spin coupling ine splitting in the proton nmr spectrum of N,N-dimethylmethanamine (trimethylamine) deducing the nature of the protons from the chemical shifts ppm in the H-1 nmr spectrum of N,N-dimethylmethanamine (trimethylamine) examining the 1H nmr spectrum of  N,N-dimethylmethanamine (trimethylamine) analysing the 1-H nmr spectrum of N,N-dimethylmethanamine (trimethylamine) how do you sketch and interpret the H-1 NMR spectrum of N,N-dimethylmethanamine (trimethylamine) interpreting interpretation of the 1H proton spin-spin coupling causing line splitting in the NMR spectrum of N,N-dimethylmethanamine (trimethylamine)  assignment of chemical shifts in the proton 1H NMR spectrum of N,N-dimethylmethanamine (trimethylamine) formula explaining spin-spin coupling for line splitting for N,N-dimethylmethanamine (trimethylamine) old names functional group tertiary aliphatic amine N,N-dimethylmethanamine (N,N-dimethylmethylamine, trimethylamine How do you interpret the H-1 NMR spectrum of trimethylamine How to interpret the H-1 NMR spectrum of trimethylamine Explanatory diagram of the chemical shifts of the 1H H-1 proton NMR spectrum of the trimethylamine molecule in terms of its molecular structure. Listing data of all the chemical shift peaks in ppm in the proton NMR spectrum of trimethylamine. How to explain the H-1 NMR spectrum of trimethylamine. The chemical shifts and  integrated values of the proton ratios in the 1-H NMR spectrum of the trimethylamine molecule. How to work out the molecular structure of the trimethylamine molecule from its proton NMR spectrum. The uses and distinctive features of the proton NMR spectrum of the trimethylamine molecule explained. What does the H-1 proton NMR spectrum chemical shifts tell us about the structure and properties of the trimethylamine molecule? explaining the spin-spin proton coupling effects in the 1H NMR spectrum of trimethylamine. interpretation diagram explaining the proton splitting pattern produced from the n+1 rule and the theoretical ratio of chemical shift δ and values of intensities for the proton NMR spectrum lines of trimethylamine

Links associated with N,N-dimethylmethanamine (trimethylamine)

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

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

The C-13 NMR spectra of N,N-dimethylmethanamine (N,N-dimethylmethylamine, trimethylamine)

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