Which of the following complexes is an outer orbital complex?

{[C o {(N H_{3})}_{6}]}_{6}^{3 +}

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{[M n {(C N)}_{6}]}_{6}^{4 -}

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{[F e {(C N)}_{6}]}_{6}^{4 -}

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{[N i {(N H_{3})}_{6}]}_{6}^{2 +}

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Solution

The correct option is D ${[N i {(N H_{3})}_{6}]}_{6}^{2 +}$
Outer orbital complexes are the complexes that use outer d-orbitals in hybridisation. The hybridisation of the given complexes are as follows:

A) ${[C o {(N H_{3})}_{6}]}_{6}^{3 +} = d^{2} s p^{3}$
B) ${[M n {(C N)}_{6}]}_{6}^{4 -} = d^{2} s p^{3}$
C) ${[F e {(C N)}_{6}]}_{6}^{4 -} = d^{2} s p^{3}$
D) ${[N i {(N H_{3})}_{6}]}_{6}^{2 +} = s p^{3} d^{2}$

So, only ${[N i {(N H_{3})}_{6}]}_{6}^{2 +}$ is an outer orbital complex.

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Similar questions

Q. Explain

[C o (N H_{3})_{6}]^{3 +}

is an inner orbital complex whereas

[N i (N H_{3})_{6}]^{2 +}

is an outer orbital complex.

Atomic number of Mn. Fe and Co are 25, 26 and 27 respectively. Which of the following inner orbital octahedral complex ions are diamangetic?
(a) $[C o (N H_{3})_{6}]^{3 +}$
(b) $[M n (C N)_{6}]^{3 -}$
(c) $[F e (C N)_{6}]^{4 -}$
(d) $[F e (C N)_{6}]^{3 -}$