For the octahedral complexes of Fe 3+ in SCN – (thiocyanato-S) and in CN – ligand environments, the difference between the spin-only magnetic moments in Bohr magnetons (When approximated to the nearest integer) is
[Atomic number of Fe = 26]
Text Solution
Verified by Experts4
(4)[Fe(SCN) 6 ] 3 – and [Fe(CN) 6 ] 3 –
In both the cases the electronic configuration of Fe 3+ will be
1s 2 , 2s 2 , 2p 6 , 3s 2 , 3p 6 , 3d 5
Since SCN is a weak field ligand and 
is a strong field ligand, the pairing will occur only in case of 
Case – 1 
Case – 2 
Difference in spin only magnetic moment = 5.91 – 1.73 = 4.18
4
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