Crystal field theory

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By Expert Faculty of Sri Chaitanya
Question

Among the following complexes the one which shows zero crystal field stabilization energy (CFSE) is

Easy
Solution

H2O is a weak field ligand, hence Δo< pairing  energy

CFSE=(-0.4x+0.6y)Δo

where, x and y are no. of electrons occupying t2gand eg orbitals respectively.

 For FeH2O63+ complex ion, 

Fe3+3d5=t2g3eg2=-0.4×3+0.6×2=0.0 or 0Dq


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lf the crystal filed splitting energy for octahedral complexes is Δ0 and for tetrahedral complexes is Δt, the two are related as

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