Which statement about coordinated-ligand substitution in $Ni(CO)_4$ and $Co(NO)(CO)_3$ is correct? Co–N–O is nearly linear; atomic numbers Ni 28 and Co 27.
Correct answer: (B) Ni complex dissociative; Co complex associative.
Explanation
Ni(CO)₄ is an 18-electron complex without a comparable readily adjustable nitrosyl electron-counting mode, so CO dissociation creates a site for substitution. In Co(NO)(CO)₃, an entering ligand can be accommodated through linear-to-bent nitrosyl reorganization, reducing NO donation and permitting an associative pathway. Thus Ni dissociative and Co associative, B.
More Organometallics: 18-Electron rule; metal-alkyl, metal-carbonyl, metal-olefin and metal-carbene complexes and metallocenes. Fluxionality in organometallic complexes. Types of organometallic reactions. Homogeneous catalysis – Hydrogenation, hydroformylation, methanol to acetic acid process, olefin metathesis and Wacker oxidation. Heterogeneous catalysis – Fischer-Tropsch reaction, Ziegler-Natta polymerization. questions
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