Deduce the structure of [NiCi₄]^2- and [Ni(CN)₄]^2- considering the hybridization of the metal ion. Calculate the magnetic moment (spin only) of the species.

CI^- is a weak ligand which is unable to pair the electrons of Ni²⁺. Therefore, here hybridization is sp³ and shape will be tetrahedral.

Electronic configuration of Ni⁺² (No. of electrons = 26) in presence of CI^­- ion, a weak ligand.

Magnetic moment of [NiCI₄]^2- = √2(2 + 2) = 2.82 BM On the other hand, CN^- is a stong ligand which pairs up the electrons of Ni²⁺. Therefore, here hybridization is dsp² and shape will be square planar.

Electronic configuration of Ni²⁺ in presence of CN^- ion, a strong ligand.

For structure of [Ni(CN)₄]^2- = √0(0 + 2) = 0.01 BM