IR PROBLEMS

Infrared (IR) absorption spectroscopy is the measure of the amount of radiation absorbed by compounds within the infrared region of the electromagnectic spectrum.  The absorption of infrared radiation is a quantized process that means only selected frequencies (energies) of infrared radiation are absorbed by a molecule. Each absorption band corresponds to energy changes related to the two types of vibration, stretching and bending of chemical bonds, in covalent molecules.  Using these absorption bands or peaks in the spectrum, the presence or absence of certain functional groups of a compound can be determined.  

For this problem set, Match the four structures with the four IR spectra in each set.  Use specific IR absorptions for various functional groups to identify the structures. Indicate the important peaks in each spectrum that help you identify the structure.  Show your work and label all the functional groups that present in each compound (see B&F 1st page).

Required reading:  B&F sections14.3-14.5 (or Mayo 146-162)

 Set 1