ઉચ્ચ સ્પિન $d^4$ અષ્ટફલકીય સંકીર્ણ માટે સ્ફટિક ક્ષેત્ર ઉર્જા ......... છે ?

Question

AIPMT 2010, Diffcult

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Solution

d
Key ldea In case of high spin complex, $\Delta_{0}$ is small. Thus, the energy required to pair up the fourth electron with the

electrons of lower energy d-orbitals would be higher than that required to place the electrons in the higher d-orbital.

Thus, pairing does not occur.

For high spin $d^{4}$ octahedral complex Crystal fleld stabilisation energy

$=(-3 \times 0.4+1 \times 0.6) \Delta_{0}$

$=(-1.2+0.6) \Delta_{0}=-0.6 \Delta_{0}$

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