For the octahedral complexes of Fe3+ in SCN−(thiocyanato-S) and in CN− ligand environments, the difference between the spin-only magnetic moment in BM (when approximated to the nearest integer) is
[Atomic number of Fe=26]
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Solution
SCN− is weak field effect (WFE) ligand whereas CN− is strong field effect (SFE) ligand.
Spin only magnetic moment =√5(5+2)=√35BM
Spin only magnetic moment =√1(1+2)=√3BM
Difference =√35−√3≃4