in complex, [ni(co)4] nickel is in zero oxidation state. the co is strong field ligand and, therefore compels

for the pairing of electrons. the hybridisation scheme is as shown in figure.

NI0([AR] 3D8 4S2)

[Ni(co) 4]

sp 3 HYBRID ORBITALS

four pairs of electrons from four co.

it is tetrahedral and as all electrons are paired so diamagnetic.

in the diamagnetic and square planar complex [ni(cn)4]2–, the nickel is in +2 oxidation state and the ion has the electronic configuration 3d8. the hybridisation scheme is as shown in FIGURE.

Ni2+, [Ar]3d8

[NI(CN) 4]2–

dsp 2 HYBRID ORBITALS

In the paramagnetic and tetrahedral complex [nicl 4]2–, the nickel is in +2 oxidation state and the ion has the electronic configuration 3d8. the hybridisation scheme is as shown in figure.

Ni2+, [Ar]3d8

[NiCl4]2–

sp3 hybrid orbitals