Advanced Organic Chemistry: Infrared spectrum of 1-chloropropane

Interpreting the infrared spectrum of 1-chloropropane

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 1-chloropropane

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Infrared spectroscopy - spectra index

C3H7Cl CH3CH2CH2Cl infrared spectrum of 1-chloropropane wavenumbers cm-1 functional group detection fingerprint pattern identification of n-propyl chloride doc brown's advanced organic chemistry revision notes 

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

1-bromopropane  C3H7Cl          

Interpretation of the infrared spectrum of 1-chloropropane

The most prominent infrared absorption lines of 1-chloropropane

C-H stretching vibrations at wavenumbers ~2880 to 3080 cm-1.

C-H bending vibrations at wavenumbers ~1300 to 1500 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-Cl vibrations at wavenumbers ~580 to 780 cm-1.

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

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