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Advanced Organic Chemistry: Infrared spectrum of 3,3-dimethylpentane

Interpreting the infrared spectrum of 3,3-dimethylpentane

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 3,3-dimethylpentane

C7H16 infrared spectrum of 3,3-dimethylpentane wavenumbers cm-1 functional group detection fingerprint pattern identification of 3,3-dimethylpentane doc brown's advanced organic chemistry revision notes 

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

 3,3-dimethylpentane C7H16 alkanes structure and naming (c) doc b alkanes structure and naming (c) doc b alkanes structure and naming (c) doc b

Interpretation of the infrared spectrum of 3,3-dimethylpentane

The most prominent infrared absorption lines of 3,3-dimethylpentane

Strong C-H stretching vibration absorptions at wavenumbers 2940 to 2880 cm-1 for the CH2 and CH3 groups in 2,3-dimethypentane.

Several strong C-H deformation vibration absorptions at wavenumbers 1480 to 1365 cm-1 for the CH2 and CH3 groups in 2,3-dimethypenttane.

Several strong C-C skeletal vibration absorptions associated with a C-(CH3)2 group occur at wavenumbers 840 to 790 and 1175 to 1140 cm-1.

The absence of other specific functional group bands will show that a particular functional group is absent from the 3,3-dimethylpentane molecular structure.

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