Crystal field theory

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Question

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

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Solution

$H_{2} O is a weak field ligand, hence Δ_{o} < pairing energy$
$CFSE = (- 0.4 x + 0.6 y) Δ_{o}$
where, x and y are no. of electrons occupying $t_{2_{g}}$ and $e_{g}$ orbitals respectively.
$For {[Fe {(H_{2} O)}_{6}]}^{3 +} complex ion,$
${Fe}^{3 +} (3 d^{5}) = t_{2 g}^{3} e_{g}^{2} = - 0.4 \times 3 + 0.6 \times 2 = 0.0 or 0 Dq$

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Crystal field theory

Remember concepts with our Masterclasses.

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

H2O is a weak field ligand, hence Δo< pairing energyCFSE=(-0.4x+0.6y)Δowhere, 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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