Question
Asked Apr 30, 2019
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1.Describe the attractive and repulsive interactions that contribute to causing the observed electronic , magnetic and structural differences between [Ni(CN)4]2- and [NiBr4]2-  .

2.Why are there 8 C3 operations listed together in the Oh character table ?

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Expert Answer

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Step 1

1.According to  spectrochemical series, Cl is a weak-field ligand as it is a π donor and
CN− is a strong-field ligand as it is a π acceptor and sigma donor.

Cl gives high-spin complex because electron-pair repulsion is very less which makes crystal field energy splitting minimal.  Electrons fill the orbitals according to Hund’s rule.

CN gives low-spin complex because electron-pair repulsion is very high which makes crystal field energy splitting maximum.  Electrons fill the orbitals according to Hund’s rule which allows electrons to go next energy level.

Therefore, complex with chloride ligand prefers tetrahedral and complex with cyanide ligand prefers square planar.

Step 2

CRYSTAL FIELD SPLITTING DIAGRAMS:

 For Nickel-cyano complex:

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Step 3

For Nickel-chlorin...

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Chemistry

Inorganic Chemistry

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