IRexamples - Examples of Infrared Spectra Click to edit...

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Click to edit Master subtitle style 8/10/11 Examples of Infrared Spectra
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8/10/11 22 An Infrared Spectrum The functional group region (4000–1400 cm– 1) The fingerprint region (1400–600 cm– 1) The functional group, or diagnostic region, is used to determine the functional group present The fingerprint region is used for structure elucidation by spectral comparison High energy Low energy
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8/10/11 33 Examine the absorption bands in the vicinity of 3000 cm–1
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8/10/11 44 wavenumber (cm–1) assignment 3075 2950 1650 and 890 absence of bands 1500–1430 and 720 sp 2 CH sp 3 CH a terminal alkene with two substituents has less than four adjacent CH2 groups
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8/10/11
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8/10/11 66 Sharp absorption bands at ~1600 cm–1 and 1500–1430 cm– 1. Overtones at 1700–1900 cm–1 for the in-plane and out-of- plane benzene C—H bends. The benzene overtones in the diagnostic region are readily Benzene ring: Benzene in-plane and out-of-plane C —H bends
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8/10/11 77 Functional group regions: Both compounds are alcohols Fingerprint regions: Compounds are different alcohols
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IRexamples - Examples of Infrared Spectra Click to edit...

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