Advanced Organic Chemistry: Infrared spectrum of N-methylethanamine CH3CH2NHCH3

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Interpreting and explaining the infrared spectrum of N-methylethanamine (ethylmethylamine)

[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 infrared spectra of ethylmethylamine [spectra page updated April 3rd 2026 *]

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Introductory note on the infrared spectrum of N-methylethanamine (ethylmethylamine)

Students and teachers please note my explanation of the infrared spectrum of N-methylethanamine (ethylmethylamine) is designed for advanced, but pre-university, chemistry courses.

Based in the infrared spectrum diagram for N-methylethanamine (ethylmethylamine), only some of the most prominent peaks for particular bond vibrations are discussed, particularly if N-methylethanamine (ethylmethylamine) has a functional group with a particular characteristic wavenumber peak.

The infrared spectrum of N-methylethanamine (ethylmethylamine) is unique and the whole, or selected wavenumbers, can be used to fingerprint its identity, sometimes analysing a mixture containing N-methylethanamine (ethylmethylamine) or following its change of concentration in a reaction.

infrared spectrum of N-methylethanamine (ethylmethylamine) C3H9N CH3NHCH2CH3 wavenumbers cm-1 functional group detection fingerprint pattern identification of N-methylethylamine doc brown's advanced organic chemistry revision notes 

Spectra obtained from a liquid film of N-methylethanamine (ethylmethylamine). The right-hand part of the of the infrared spectrum of N-methylethanamine (ethylmethylamine), wavenumbers ~1500 to 400 cm-1 is considered the fingerprint region for the identification of N-methylethanamine (ethylmethylamine) and most organic compounds. It is due to a unique set of complex overlapping vibrations of the atoms of the molecule of N-methylethanamine (ethylmethylamine) - a secondary aliphatic amine.

N-methylethanamine, N-methylethylamine, ethylmethylamine, (c) doc b, (c) doc b

The classification, structure and naming of organic nitrogen compounds

Interpretation of the infrared spectrum of N-methylethanamine (ethylmethylamine)

The most prominent infrared absorption lines of N-methylethanamine (ethylmethylamine).

Without the actual infrared spectrum of N-methyethanamine, all I can offer is what you might expect!

At wavenumbers ~3500 to 3300 cm-1 expect a broad band for N-H bond stretching vibrations, characteristic of amines like N-methyethanamine.

Primary amines have a highly polar bond (δ-N-Hδ+) and the intermolecular forces are increased by permanent dipole - permanent dipole attractions including hydrogen bonding (N-Hδ+llllδ-N-H) between the N-methylethanamine molecules.

The hydrogen bonding interferes with the N-H stretching vibrations producing a broad band peaking at around ~3400 cm-1.

Expect around 3000 to 2800 cm-1 are absorptions due to C-H stretching vibrations - they overlap with the N-H stretching vibrations of N-methylethanamine.

Expect N-CH3 vibrations occur at wavenumbers 2820 to 2760 cm-1 and overlap with the C-H vibration absorptions quoted above.

Expect characteristic bands due to N-H vibrations at wavenumbers ~1650 to 1580 cm-1, often sharp, so do not confuse with the C=O vibrations from carbonyl compounds.

Expect absorption due to C-N vibrations, characteristic of C-N bonds in aliphatic amines like N-methylethanamine occur at 1250 to 1020 cm-1.

There are other N-H vibration absorptions at wavenumbers ~910 to 665 cm-1,

The absence of other specific functional group bands will show that a particular functional group is absent from the N-methylethanamine (ethylmethylamine) molecular structure.

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The mass spectra of N-methylethylamine (N-methylethanamine, ethylmethylamine)

The H-1 NMR spectra of N-methylethylamine (N-methylethanamine, ethylmethylamine)

The C-13 NMR spectra of N-methylethylamine (N-methylethanamine, ethylmethylamine)

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