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Advanced Organic Chemistry: Infrared spectrum of methyl methanoate

Interpreting the infrared spectrum of methyl methanoate

Doc Brown's Chemistry Advanced Level Pre-University Chemistry Revision Study Notes for UK IB KS5 A/AS GCE advanced A level organic chemistry students US K12 grade 11 grade 12 organic chemistry courses involving molecular spectroscopy analysing infrared spectra of methyl methanoate

infrared spectrum of methyl methanoate wavenumbers cm-1 functional group detection fingerprint pattern identification of methyl formate doc brown's advanced organic chemistry revision notes 

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

Methyl methanoate (methyl formate) C2H4O2,  (c) doc b , (c) doc b , (c) doc b

Interpretation of the infrared spectrum of methyl methanoate (an ester)

The most prominent infrared absorption lines of methyl methanoate

Around wavenumber 2900 cm-1 there are absorptions due to C-H stretching vibrations.

There is a strong absorption band at 1750 to 1735 cm-1 due to the carbonyl group, C=O stretching vibrations. - the most characteristic feature of the spectrum.

At 1200 to 1180 cm-1 absorptions are due to C-O stretching vibrations characteristic of methanoate esters (formates).

The absence of other specific functional group bands will show that particular functional group is absent from the methyl methanoate molecular structure.

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