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Introduction to CFT

Identify the ...

Question

Identify the complexes which are expected to be coloured:

[T i (N O_{3})_{4}]

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[C u (N C - C H_{3})_{4}]^{+} B F_{4}^{-}

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[C r (N H_{3})_{6}]^{3 +} + 3 C l^{-}

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K_{3} [V F_{6}]

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Solution

The correct options are
A $K_{3} [V F_{6}]$
C $[C r (N H_{3})_{6}]^{3 +} + 3 C l^{-}$
$[T i (N O_{3})_{4}] \to T i^{4 +} \to [A r]$

$[C r (N H_{3})_{6}]^{3 +} 3 C l^{-} \to C r^{3 +} \to [A r] 3 d^{3}$

$K_{3} [V F_{6}] \to V^{3 +} \to [A r] 3 d^{2}$

$C u (N C - C H_{3})_{4}]^{+} B F_{4}^{-} \to C u^{+} \to [A r] 3 d^{10}$

Out of all only $C r^{3 +}$ and $V^{3 +}$ have partially filled d-orbitals so only these two complexes that will show colour.

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_{3}

_{4}

_{3}

^{+}

_{4}

_{3}

_{6}

^{3 +}

^{-}

_{3}

_{6}

[C r (H_{2} O)_{6}] C l_{3}

(A)

[C r (N H_{3})_{6}] C l_{3}

(B)

K_{3} [V F_{6}]

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