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Advanced Organic Chemistry: Infrared spectrum of urea

Interpreting the infrared spectrum of urea

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 urea

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Infrared spectroscopy - spectra index

infrared spectrum of urea CH4N2O CO(NH2)2 O=C(NH2)2 wavenumbers cm-1 functional group detection NH2 C=O fingerprint pattern identification of urea doc brown's advanced organic chemistry revision notes  

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

Urea, CH4N2O, CO(NH2)2, O=C(NH2)2

Interpretation of the infrared spectrum of urea

The most prominent infrared absorption lines of urea (wavenumber bands in cm-1)

Twin peaks of a broad band from N-H stretching vibrations at 3200 to 3600 cm-1.

At ~1700 cm-1 is the stretching vibration absorption band for the C=O carbonyl group.

At ~1600-1650 cm-1 is a double peak absorption band for other N-H vibrations.

Both the peak absorptions at ~1450 and 1150 cm-1 maybe both due to C-N vibrations?

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

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