SPECTROSCOPY INDEXES  *  All Advanced Organic Chemistry Notes  *  [SEARCH BOX]

Advanced Organic Chemistry: Infrared spectrum of methanol

Scroll down and take time to study the content and/or follow links or [Use the website search box]

Interpreting the infrared spectrum of methanol

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 methanol

email doc brown

Use your mobile phone or ipad etc. in 'landscape' mode

This is a BIG website, you need to take time to explore it

Infrared spectroscopy - spectra index

CH3OH infrared spectrum of methanol wavenumbers cm-1 functional group detection fingerprint pattern identification of methanol methyl alcohol doc brown's advanced organic chemistry revision notes 

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

Methanol  CH4O alcohols and ether structure and naming (c) doc b alcohols and ether structure and naming (c) doc b alcohols and ether structure and naming (c) doc b alcohols and ether structure and naming (c) doc b

Interpretation of the infrared spectrum of methanol

The most prominent infrared absorption lines of methanol

The very characteristic strong absorption band for the O-H stretching vibrations at wavenumbers 3400 to 3200 cm-1.

This absorption band is broadened by the intermolecular hydrogen bonding interactions between the hydroxyl groups of adjacent methanol molecules.

Hydrogen bonding (llll) between methanol molecules  CH3-OHδ+llllδ:O-CH3

The absorption bands ~2900 cm-1 arise from C-H bond stretching vibrations - common to most organic molecules.

There are several strong absorptions bands at wavenumbers 1075 to 1000 cm-1 and 1350 to 1260 cm-1 from the stretching vibrations of the C-O bond.

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

In this case there is a strong broad characteristic absorption of a molecule with a hydroxyl group exhibiting intermolecular hydrogen bonding e.g. aliphatic alcohols.

Key words & phrases: CH3OH image and diagram explaining the infrared spectrum of methanol, complete infrared absorption spectrum of methanol, comparative spectra of methanol, prominent peaks/troughs for identifying functional groups in the infrared spectrum of methanol, important wavenumber values in cm-1 for peaks/troughs in the infrared spectrum of methanol, revision of infrared spectroscopy of methanol, fingerprint region analysis of methanol, how to identify methanol from its infrared spectrum, identifying organic compounds like methanol from their infrared spectrum, how to analyse the absorption bands in the infrared spectrum of methanol detection of hydroxyl functional groups in the methanol molecule example of the infrared spectrum of a molecule like methanol with a functional hydroxy group  interpreting interpretation of the infrared spectrum of methanol shows presence of hydroxyl hydroxy functional group CH3OH methyl alcohol

Links associated with methanol

The chemistry of ALCOHOLS revision notes INDEX

Infrared spectroscopy index


All Advanced Organic Chemistry Notes

Use My Google search site box

Email doc b: chem55555@hotmail.com

 Doc Brown's Chemistry