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Advanced Organic Chemistry: Infrared spectrum of 3-methylbut-1-ene (3-methyl-1-butene)

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Interpreting the infrared spectrum of 3-methylbut-1-ene (3-methyl-1-butene)

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 3-methylbut-1-ene (3-methyl-1-butene)

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Infrared spectroscopy - spectra index

C5H10 infrared spectrum of 3-methylbut-1-ene (3-methyl-1-butene) wavenumbers cm-1 functional group detection fingerprint pattern identification of 3-methylbut-1-ene (3-methyl-1-butene) doc brown's advanced organic chemistry revision notes 

Spectra obtained from a liquid film of 3-methylbut-1-ene (3-methyl-1-butene). The right-hand part of the of the infrared spectrum of 3-methylbut-1-ene (3-methyl-1-butene), wavenumbers ~1500 to 400 cm-1 is considered the fingerprint region for the identification of 3-methylbut-1-ene (3-methyl-1-butene) and most organic compounds. It is due to a unique set of complex overlapping vibrations of the atoms of the molecule of 3-methylbut-1-ene (3-methyl-1-butene).

3-methylbut-1-ene C5H10, alkenes structure and naming (c) doc b, alkenes structure and naming (c) doc b, alkenes structure and naming (c) doc b

Interpretation of the infrared spectrum of 3-methylbut-1-ene (3-methyl-1-butene)

The most prominent infrared absorption lines of 3-methylbut-1-ene (3-methyl-1-butene)

The most characteristic absorption is ~1660 cm-1 due to the C=C vibration (stretching).

You don't find this C=C absorption band in the infrared spectra of saturated alkanes.

There are also characteristic lines due to various C-H vibration absorptions group at wavenumbers ~3100, ~2900, ~1290-1420 and ~800 to 900 cm-1.

The absence of other specific functional group bands will show that particular functional group is absent from the 3-methylbut-1-ene (3-methyl-1-butene) molecular structure.


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