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Why pcl5 have no berry rotation,what is the reason for this?,and what is berry rotation

Why pcl5 have no berry rotation,what is the reason for this?,and what is berry rotation

Grade:12th pass

1 Answers

Arun
25750 Points
6 years ago
The Berry mechanism, or Berry pseudorotation mechanism, is a type of vibration causing molecules of certain geometries to isomerize by exchanging the two axial ligands (see Figure at right) for two of the equatorial ones. It is the most widely accepted mechanism for pseudorotation. It most commonly occurs in trigonal bipyramidal molecules, such as PF, though it can also occur in molecules with a square pyramidal geometry.in pcl5 the axial bonds suffer repulsion from the equatorial bonds so they become long and weak but in pf5 the axial and equatorial bonds are of nearly equal length because the repulsion between the bonds tries to make axial bonds longer but fluorine being most electronegative makes the P-F bond shorter as a result axial bonds become nearly equal to equatorial bonds

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