Engineering
Chemistry
Dipole Moment
Question
Why dipole moment of PF2Cl3 is zero but that of PF3Cl2 is non-zero?
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Solution
The compounds PF3Cl2 and PF2Cl3 appear to have a basic trigonal bipyramid structure, F atoms in PF2Cl3 assume axile positions, while in PF3Cl2. The structure is C2v, in which there are one equatarial and two axial F atoms.
This gives rise to stronger equatarial than axial bonds.
Thus dipole moment cancles out in PCl3F2, whereas it is non-zero in PCl2F3.
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