Coordination Compounds 2 Question 10
####11. The magnetic moment of an octahedral homoleptic $Mn(II)$ complex is 5.9 BM. The suitable ligand for this complex is
(a) $CN^{-}$
(b) ethylenediamine
(c) $NCS$
(d) $CO$
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Solution:
- The magnetic moment of the magnitude 5.9 BM suggest the presence of 5 unpaired electrons in $Mn(II)$. This can be cross verified by putting the value (5) of unpaired electrons in the formula, $\mu=\sqrt{n(n+2)}$ BM
Thus, the valence electronic configuration of $Mn(II)$ in the complex is
The octahedral homoleptic complex suggests $s p^{3} d^{2}$-hybridisation in the complex, i.e.
Thus, 5 unpaired electrons are present in the complex which suggest the presence of a weak ligand like $NCS^{-}$.
