SATHEE: Coordination Compounds 2 Question 69

Coordination Compounds 2 Question 69

####71. Identify the complexes which are expected to be coloured. Explain

$(1994, 2 M)$ (i) $[T i {(N O_{3})}_{4}]$ (ii) ${[C u (N C C H_{3})]}^{+} B F_{4}$ (iii) $[C r {(N H_{3})}_{6}] C l_{3}$ (iv) $K_{3} [V F_{6}]$

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Solution:

(i) $[T i {(N O_{3})}_{4}] : T i^{4 +} (3 d^{0})$ No $d$ -electron, no $d$ - $d$ transition possible, colourless.

(ii) $[C u (N C C H_{3})] B F_{4} : C u^{+} (3 d^{10})$ All $d$ -orbitals are completely filled, no $d - d$ transition possible, colourless.

(iii) $[C r {(N H_{3})}_{6}] C l_{3} : C r^{3 +} (3 d^{3})$ Complex has allowed $d$ - $d$ -transitions from $t_{2 g}$ to $e_{g}$ level, hence coloured.

(iv) $K_{3} [V F_{6}] : V^{3 +} (3 d^{2})$ Complex has allowed $d$ - $d$ -transitions from $t_{2 g}$ to $e_{g}$ level, hence coloured.

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Coordination Compounds 2 Question 69

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