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e) 1H-NMR can be used to measure the triad tacticity of a polymer

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050216 Quiz NMR

a) Both IR and NMR use Fourier Transforms to convert a decay curve to a spectra. Explain how a Fourier transform is used in NMR and how this differs from the use in an FTIR instrument.

b) In NMR a peak can be split by the coupling constant J in to a triad for instance. Explain why a triad might be observed and what the value of the coupling constant describes.

c) What do the chemical shift, , and the amplitude of a proton NMR absorption peak relate to?

d) Sketch the 1H-NMR pattern for polystyrene paying attention to the number of protons of each type and their chemical shift values.

e) 1H-NMR can be used to measure the triad tacticity of a polymer. List the three types of triad tacticity and explain how triad tacticity relates to diad tacticity (two types). For a sample of random tacticity (atactic) what mixture of diad tacticities do you expect? What mixture of triad tacticities do you expect?

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