Givereasons: Co2+ is easily oxidised to Co3+ in presence of a ligand CO is stronger complexing reagent than NH3 Molecular shape of Ni(CO)4 is not same as [Ni(CN)4]2-
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Co2+ ions can be easily oxidised to Co3+ ions because the crystal field stabilisation energy of Co3+ ion with a d6 configuration is higher than Co2+ ion with a d7 configuration.
In presence of ligand the d-orbitals of metal gets splits up into two set of orbitals that is t2g and eg. The half filled or fully filled t2g is more stable than other configurations. This is because it gives maximum amount of low energy of t2g orbitals. Lower the energy more is the stabilisation.
CO a stronger complexing reagent than NH3 because of synergic effect in case of CO. CO is good sigma donor and pi acceptor. There exists back bonding in CO Metal complexes in which there is donation of electrons from filled d-orbital of metals to empty π* molecular orbital of CO takes place. This back bonding strengthen the bond between metal and CO ligand. Thus CO forms a stronger bond then NH3
In presence of ligand the d-orbitals of metal gets splits up into two set of orbitals that is t2g and eg. The half filled or fully filled t2g is more stable than other configurations. This is because it gives maximum amount of low energy of t2g orbitals. Lower the energy more is the stabilisation.
CO a stronger complexing reagent than NH3 because of synergic effect in case of CO. CO is good sigma donor and pi acceptor. There exists back bonding in CO Metal complexes in which there is donation of electrons from filled d-orbital of metals to empty π* molecular orbital of CO takes place. This back bonding strengthen the bond between metal and CO ligand. Thus CO forms a stronger bond then NH3
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