Identify the homoleptic complex(es) that is/are low spin. [2025]

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Solution

Q.
Identify the homoleptic complex(es) that is/are low spin. [2025]

(A) ${[Fe {(CN)}_{5} NO]}^{2 -}$
(B) ${[{CoF}_{6}]}^{3 -}$
(C) ${[Fe {(CN)}_{6}]}^{4 -}$
(D) ${[Co {({NH}_{3})}_{6}]}^{3 +}$
(E) ${[Cr {(H_{2} O)}_{6}]}^{2 +}$

1 (C) and (D) only

2 (B) and (E) only

3 (C) only

4 (A) and (C) only

Ans.
(1)

Homoleptic complexes in which a metal is bound to only one kind of donor groups. B, C, D and E are homoleptic. Low spin complexes are formed by metal ions with $d^{4}$ to $d^{7}$ configurations that are bound to strong field ligands. As $F^{-}$ and $H_{2} O$ are weak field ligands, (B) and (E) are high spin complexes. $C N^{-}$ and $N H_{3}$ are strong field ligands, so (C) (which has ${Fe}^{2 +} = {}_{18}{[Ar]}$ $3 d^{6}$ ) and (D) (which has $C o^{3 +} = {}_{18}{[Ar]}$ $3 d^{6}$ ) are low spin complexes.

Heteroleptic complexes in which a metal is bound to more than one kind of donor groups. A is heteroleptic.

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