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The Hybridisation for NiCN42- is dsp2.
The energy of individual atoms’ orbitals is transferred to give orbitals of equivalent energy when two atomic orbitals combine to produce a hybrid orbital in a molecule. Hybridization is the term for this procedure. Hybridized orbitals are a feature of valence bond theory and are used to explain the form of molecular orbitals for molecules.
Nickel has an atomic number of 28. Nickel’s electrical arrangement is Ni=Ar3d84s2.
There is a Ni2+ ion in NiCN42- with the electrical configuration 3d84s0 in the valence shell.
All electrons are coupled up in the presence of strong field CN- ions.
In square planar geometry, the vacant 3d, 3s, and two 4p orbitals undergo dsp2 hybridization to form bonds with CN- ligands.
As a result, NiCN42- has a diamagnetic property. It’s a low-spin inner orbital complex, according to the name.
Below is a diagram of dsp2 hybridisation in the NiCN42- ion.
