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kompoz [17]
3 years ago
15

The structure of PF3(C6H5)2 is trigonal bipyramidal, with one equatorial and two axial F atoms which interchange positions when

heated. Describe the low- and high- temperature 31P and 19F NMR spectra.
Engineering
1 answer:
Iteru [2.4K]3 years ago
6 0

Answer:

For 31 P NMR spectra

<u>low temperature </u>

there is two types of 19f seen in low temperature and they are

  • one at equitorial
  • one at axial

therefore in low temperature the 31p couples with the two types of 19F seen ( b_{f} and c_{f}to form a triplet and this couples more with a_{f} to form a doublet. i.e. one (1) peak

<u>High temperature </u>

At High temperature The exchange is fast here therefore the 31p spectra sees all 19p at once and in the same environment leading to the formation of one (1) peak

For 19 P NMR spectra

<u>low temperature </u>

In low temperature a_{f}, b_{f}  , c_{f} is fixed  and the environment where b_{f} and c _{f} is the same hence a peak is formed and another peak is formed by a_{f} that makes the number of peaks = 2 peaks

<u>High temperature </u>

In high temperature a_{f}, b_{f}  , c_{f}  exchange very fast therefore one peak is formed for all, since the fast exchanges makes NMR machine to take an average and produce just one peak for all

Explanation:

For 31 P NMR spectra

<u>low temperature </u>

there is two types of 19f seen in low temperature and they are

  • one at equitorial
  • one at axial

therefore in low temperature the 31p couples with the two types of 19F seen ( b_{f} and c_{f}to form a triplet and this couples more with a_{f} to form a doublet. i.e. one (1) peak

<u>High temperature </u>

At High temperature The exchange is fast here therefore the 31p spectra sees all 19p at once and in the same environment leading to the formation of one (1) peak

For 19 P NMR spectra

<u>low temperature </u>

In low temperature a_{f}, b_{f}  , c_{f} is fixed  and the environment where b_{f} and c _{f} is the same hence a peak is formed and another peak is formed by a_{f} that makes the number of peaks = 2 peaks

<u>High temperature </u>

In high temperature a_{f}, b_{f}  , c_{f}  exchange very fast therefore one peak is formed for all, since the fast exchanges makes NMR machine to take an average and produce just one peak for all

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