Advanced Organic Chemistry: Infrared spectrum of trimethylamine (CH3)3N

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Interpreting and explaining the infrared spectrum of N,N-dimethylmethanamine (N,N-dimethylmethylamine, trimethylamine)

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Introductory note on the infrared spectrum of trimethylamine

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

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

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

infrared spectrum of N,N-dimethylmethanamine (trimethylamine) C3H9N (CH3)3N wavenumbers cm-1 functional group detection fingerprint pattern identification of N,N-dimethylmethylamine doc brown's advanced organic chemistry revision notes 

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

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

The classification, structure and naming of organic nitrogen compounds

Interpretation of the infrared spectrum of N,N-dimethylmethanamine (trimethylamine)

The most prominent infrared absorption lines of N,N-dimethylmethanamine (trimethylamine)

Around 3000 to 2800 cm-1 are absorptions due to C-H stretching vibrations.

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

Absorption due to C-N vibrations, characteristic of C-N bonds in aliphatic amines like trimethylamine occur at 1220 to 1020 cm-1.

There are no N-H vibration absorptions because tertiary amines do NOT have a N-H bond, which, in terms of infrared spectra, distinguishes them from primary and secondary aliphatic amines.,

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


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Links associated with N,N-dimethylmethanamine (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)

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

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