Advanced Organic Chemistry: Infrared spectrum of 1-iodopropane CH3CH2CH2I

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Interpreting and explaining the infrared spectrum of 1-iodopropane (n-propyl iodide)

[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 1-iodopropane (IR spectra) [spectra page updated Mar 30th 2026 *]

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 Infrared spectroscopy - spectra index

Introductory note on the infrared spectrum of 1-iodopropane

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

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

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

infrared spectrum of 1-iodopropane C3H7I CH3CH2CH2I wavenumbers cm-1 functional group detection fingerprint pattern identification of propyl iodide doc brown's advanced organic chemistry revision notes 

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

1-iodopropane, C3H7I, CH3CH2CH2I, CH3-CH2-CH2-I

The molecular structure and naming of haloalkanes

Interpretation of the infrared spectrum of 1-iodopropane

The most prominent infrared absorption lines of 1-iodopropane

C-H stretching vibration absorptions. peaking at wavenumbers ~2845 to 2975 cm-1.

C-H bending/deformation vibrations absorption bands peaking at wavenumbers ~1370 to 1470 cm-1.

C-C-C skeletal vibrations from the CH3-C-CH3 grouping occur at wavenumbers ~1140 to 1175 cm-1. and 840 to 790 cm-1.

Characteristic groups of C-I stretching vibration absorptions at wavenumbers ~600 to 500 cm-1.

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

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Links associated with 1-iodopropane

The chemistry of HALOGENOALKANES (haloalkanes) revision notes INDEX

The mass spectrum of 1-iodopropane (n-propyl iodide)

The H-1 NMR spectrum of 1-iodopropane (n-propyl iodide)

The C-13 NMR spectrum of 1-iodopropane (n-propyl iodide)

Infrared spectroscopy index

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