Subjective Type

For the octahedral complexes of $$\displaystyle Fe^{3+}$$ in $$\displaystyle SCN^{-}$$ (thiocyanato-$$S$$) and in $$\displaystyle CN^{-}$$ 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]

Solution

$$Fe^{3+}$$ has $$3d^5$$ outer electronic electronic configuration.

$$CN^-$$ ion is a strong field ligand. It produces low spin complex with 1 unpaired electron having a magnetic moment.

$$\mu _{eff} = \sqrt {n(n+2)} =\sqrt {1(1+2)}=\sqrt {3} =1.73 \: B.M.$$

$$SCN^-$$ ion is a weak field ligand. It produces high spin complex with 5 unpaired electrons having a magnetic moment.

$$\mu _{eff} = \sqrt {n(n+2)} =\sqrt {5(5+2)}=\sqrt {35} =5.92 \: B.M.$$

Hence, the difference in the magnetic moment is $$5.92 \: B.M.-1.73 \: B.M.=4.19 \: B.M. \simeq 4 \: B.M.$$

SIMILAR QUESTIONS

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Coordination Compounds

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Coordination Compounds

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Coordination Compounds

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Coordination Compounds

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Coordination Compounds

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