Q33 · CSIR-NET Chemistry, June 2019

Paper: CSIR-NET June 2019 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Molecular Orbital Ligand Field · Marks: 2 · Difficulty: Medium

Donor mode of NO ligand depends on the metal. Now, consider the following complexes (in gaseous state).
\[ \begin{array}{l} \text{(A) } [\mathrm{IrCl(CO)(PPh_3)_2(NO)}]^{+} \\ \text{(B) } [\mathrm{RuCl(PPh_3)_2(NO)_2}]^{+} \\ \text{(C) } [\mathrm{Co(NCS)(diars)_2(NO)}]^{+} \text{, where diars} \rightarrow \text{o-}(\mathrm{Me_2As})_2\mathrm{C_6H_4}. \\ \text{(D) } [\mathrm{Cr(CN)_5(NO)}]^{3-} \end{array} \]
The complex(es) that do NOT exhibit bent NO coordination mode is/are
(a)A and B
(b)C and D
(c)D only
(d)B only
Answer
Answer: C ✓ checked by 4AB · confidence medium
Explanation
The Ir(III), Ru (one of the two NO groups) and Co(III) complexes contain a bent NO⁻ ligand. [Cr(CN)₅(NO)]³⁻ has a linear Cr–N–O (NO⁺-type). D only (c).

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