Engineering, 11.11.2020 17:50 ddaaaeeee2960

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.

Answers: 2

Show answers

Answers

Answer from: Lena3055

For 31 P NMR spectra

low temperature

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

High temperature

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

low temperature

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

High temperature

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

low temperature

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

High temperature

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

low temperature

High temperature

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

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

Answer from: Quest

diy

explanation:

Answer from: Quest

unlike the threaded fasteners which are used to clamp the machine members, power screws are used to transmit power. common applications of power screws are: screw jacks: to lift weight. lead screw of lathe: for axial movement of tool and its precise positioning.

Another question on Engineering

Engineering, 03.07.2019 15:10

If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.

Answers: 1

Answer

Engineering, 04.07.2019 18:10

If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79

Answers: 1

Answer

Engineering, 04.07.2019 18:10

Afluid flows with a velocity field given by v=(x/t)i.. determine the local and convective accelerations when x=3 and t=1.

Answers: 2

Answer

Engineering, 04.07.2019 18:10

Assuming compressible flow of air and that the measurements are done at flagstaff a pitot static tube that gives the difference of total and static pressure measures 0.35 m of mercury. what is the velocity of air? assume the temperature to be 300k. (submit your excel or matlab calculation sheet)

Answers: 1

Answer

You know the right answer?

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

Questions