Question

Advanced Inorganic chemistry Why would t-butyl alcohol be a poor reference choice for an Evans' method...

Advanced Inorganic chemistry

Why would t-butyl alcohol be a poor reference choice for an Evans' method on a Europium complex done in CDCl3?

Homework Answers

Answer #1
  • In this method difference in the NMR chemical shift in a solvent caused by the presence of a paramagnetic species is used.
  • It can be used to determine the magnetic moment of the paramagnetic and the number of unpaired electrons present.
  • NMR shift reagents such as Eu complex exploit the isotropic effect (difference between the chemical shift of a given nucleus in a diamagnetic vs paramagnetic environments).
  • NMR measurements are conducted on diamagnetic compounds. Europium is a paramagnetic element.
  • t-butyl alcohol is a diamagnetic reference. Hence, it is a poor reference.
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