Advanced Organic Chemistry: Infrared spectrum of cyclohexane C6H12

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Interpreting the infrared spectrum of cyclohexane C6H12

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 cyclohexane

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Infrared spectroscopy - spectra index

C6H12 infrared spectrum of cyclohexane wavenumbers cm-1 functional group detection fingerprint pattern identification of cyclohexane doc brown's advanced organic chemistry revision notes 

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

Cyclohexane, C6H12 , alkanes structure and naming (c) doc b , alkanes structure and naming (c) doc b , all bond angles ~109o

Interpretation of the infrared spectrum of cyclohexane

The most prominent infrared absorption lines of cyclohexane

From 2950 to 2845 cm-1 there are multiple peaks amounting to strong absorption due to C-H stretching vibrations in the -CH2- or -CH3 groups in octane.

The are other C-H absorptions due to C-H deformation vibrations of the CH2 groups at 1480 to 1440 cm-1.

Skeletal C-C vibrations show an absorption ~950 cm-1 for -(CH2)n-, where n is >3, which is obviously the case in cyclohexane.

There are no specific characteristic lines for alkanes like cyclohexane because C-C and C-H vibrations are common to so many organic molecules and alkanes like cyclohexane have no functional group that gives a characteristic vibration.

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


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Where next? Links associated with cyclopentane

The mass spectrum of cyclohexane

The C-13 NMR spectrum of cyclohexane

The H-1 NMR spectrum of cyclohexane

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Infrared spectroscopy index

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