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Advanced Organic Chemistry: Infrared spectrum of butan-1-ol

Interpreting the infrared spectrum of butan-1-ol (1-butanol)

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 butan-1-ol 1-butanol

infrared spectrum of butan-1-ol wavenumbers cm-1 functional group detection fingerprint pattern identification of 1-butanol doc brown's advanced organic chemistry revision notes 

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

Butan-1-ol C4H10O , alcohols and ether structure and naming (c) doc b . alcohols and ether structure and naming (c) doc b

Interpretation of the infrared spectrum of butan-1-ol (1-butanol, n-butyl alcohol)

The most prominent infrared absorption lines of butan-1-ol

The most characteristic absorption is the broad O-H stretching vibration band at wavenumbers ~3500 to 3200 cm-1, the breadth is caused by hydrogen bonding interactions, common to all hydrogen bonded molecules with a hydroxy group.

C-H stretching vibration absorption occurs ~2900 cm-1, wavenumbers common to any molecule with alkyl groups.

There are wavenumber C-O stretching vibration absorption bands ~1350 to 1070 cm-1.

The absence of other specific functional group bands will show that particular functional group is absent from the butan-1-ol molecular structure.


Key words & phrases: 1-butanol n-butyl alcohol image and diagram explaining the infrared spectrum of butan-1-ol, complete infrared absorption spectrum of butan-1-ol, comparative spectra of butan-1-ol, prominent peaks/troughs for identifying functional groups in the infrared spectrum of butan-1-ol, important wavenumber values in cm-1 for peaks/troughs in the infrared spectrum of butan-1-ol, revision of infrared spectroscopy of butan-1-ol, fingerprint region analysis of butan-1-ol, how to identify butan-1-ol from its infrared spectrum, identifying organic compounds like butan-1-ol from their infrared spectrum, how to analyse the absorption bands in the infrared spectrum of butan-1-ol detection of functional groups in the butan-1-ol molecule example of the infrared spectrum of a molecule like butan-1-ol with an alcohol functional group 1-butanol n-butyl alcohol


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