Chapter 21, Problem 21.131MP

Nickel(II) complexes with the formula ${\text{NiX}}_{\text{2}}{\text{L}}_{\text{2}}$ , where ${\text{X}}^{-}$ is ${\text{Cl}}^{-}$ or N-bonded ${\text{NCS}}^{-}$ and L is the monodentate triphenylphosphine ligand $\text{P}{\left({\text{C}}_{\text{6}}{\text{H}}_{\text{5}}\right)}_{\text{3}}$ , can be square planar ortetrahedral.
(a) Draw crystal field energy-level diagrams for a squareplanar and a tetrahedral nickel(II) complex, and show the population of the orbitals.
(b) If ${\text{NiCl}}_{\text{2}}{\text{L}}_{\text{2}}$ is paramagnetic and $\text{Ni}{\left(\text{NCS}\right)}_{\text{2}}{\text{L}}_{\text{2}}$ is diamagnetic, which of the two complexes is tetrahedral and which is square planar?
(c) Draw possible structures for each of the ${\text{NiX}}_{\text{2}}{\text{L}}_{\text{2}}$ , complexes, and tell which ones have a dipole moment.