Advanced Organic Chemistry: Infrared spectrum of Pent-1-ene H2C=CHCH2CH2CH3

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Interpreting the infrared spectrum of Pent-1-ene (1-pentene)

[Author © Dr Phil Brown PhD: Doc Brown's advanced level organic chemistry exam revision notes suitable for students of UK A level chemistry courses & US K12 grade 11, grade 12 and AP honors chemistry courses: Molecular spectroscopy analysis of pent-1-ene [spectra page updated Mar 25th 2026 *]

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 Associated links for pent-1-ene (1-pentene)

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Introductory note on the infrared spectrum of pent-1-ene

Students and teachers please note my explanation of the infrared spectrum of pent-1-ene is designed for advanced, but pre-university, chemistry courses.

Based in the infrared spectrum diagram for pent-1-ene, only some of the most prominent peaks for particular bond vibrations are discussed, particularly if pent-1-ene has a functional group with a particular characteristic wavenumber peak.

The infrared spectrum of pent-1-ene is unique and the whole, or selected wavenumbers, can be used to fingerprint its identity, sometimes analysing a mixture containing pent-1-ene or following its change of concentration in a reaction.

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

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

Pent-1-ene, alkenes structure and naming (c) doc b , alkenes structure and naming (c) doc b , alkenes structure and naming (c) doc b (1-pentene)

an alkene The molecular structure and naming of alkenes

Interpretation of the spectrum of pent-1-ene

The most prominent infrared absorption lines of pent-1-ene

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 ~900 cm-1.

The absorption band at 915 to 905 cm-1 is due to C-H vibrations of the =CH2 group.

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

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What next? Associated links for pent-1-ene (1-pentene)

The mass spectrum of Pent-1-ene (1-pentene)

The H-1 NMR spectrum of Pent-1-ene (1-pentene)

The C-13 NMR spectrum of Pent-1-ene (1-pentene)

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