Advanced Organic Chemistry: Infrared spectrum of propylbenzene

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Interpreting and explaining the infrared spectrum of propylbenzene (1-phenylpropane)

[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 propylbenzene [spectra updated Mar 28th 2026 *]

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 Infrared spectroscopy - spectra index

Introductory note on the infrared spectrum of propylbenzene

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

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

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

C9H12 infrared spectrum of propylbenzene wavenumbers cm-1 functional group detection fingerprint pattern identification of 1-phenylpropane doc brown's advanced organic chemistry revision notes 

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

propylbenzene, 1-phenylpropane, C9H12 , C6H5CH2CH2CH3 , (c) doc b  , (c) doc b 

The molecular structure and naming of aromatic compounds

The molecular structure and naming of alkanes

Interpretation of the infrared spectrum of propylbenzene

The most prominent infrared absorption lines of propylbenzene

Strong absorption at wavenumbers 3080 to 3030 cm-1 due to =C-H aryl C-H stretching vibrations.

Strong C-H stretching vibrations from the alkyl groups (CH2 and CH3) at wavenumbers 2975 to 2845 cm-1.

The benzene ring stretching vibrations with peaks close to wavenumbers 1600 and 1500 cm-1. Note the bond has a bond order of 1.5 in a benzene ring, NOT a full double C=C bond, of bond order 2.

C-H side-chain alkyl vibrations are observed at wavenumbers 1470 to 1370 cm-1.

Other aryl C-H vibration absorptions occur at wavenumbers 770 to 690 cm-1 characteristic of a monosubstituted benzene ring.

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

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The mass spectrum of propylbenzene

The H-1 NMR spectrum of Propylbenzene

TheC-13 NMR spectrum of Propylbenzene

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Website content © Dr Phil Brown 2000+. All copyrights reserved on revision notes, images, quizzes, worksheets etc. Copying of Doc Brown's pre-university advanced level chemistry website material is NOT permitted. Exam revision summaries & references to science course specifications are unofficial. These organic chemistry revision notes on spectroscopy (on the infrared spectrum of propylbenzene, 1-phenylpropane) are suitable for use of pre-university students studying AQA advanced level chemistry, Edexcel advanced level chemistry, OCR advanced level chemistry, IB advanced level chemistry, WJEC (Eduqas) advanced level chemistry, CIE advanced level chemistry, CCEA advanced level chemistry, US grade 11-12 AP honors chemistry courses and they will also prove useful to 1st year undergraduate students of chemistry.

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