Question

4 Consider an eight coordinate complex ML, with the metal located at the center of a cube and the ligands at the corners of this cube. (a) What is the point group symmetry of this complex? (b) Draw a chart the shows the splitting of the 3p orbitals in such a cubic complex using the crystal field approach. Be careful to show the relative energies of the orbitals involved. (c) Draw a chart the shows the splitting of the 3d orbitals in such a cubic complex using the crystal field approach. Be careful to show the relative energies of the orbitals involved. (d) Compare the magnitude of the splitting of the 3d orbitals in your chart in (c) to that of a corresponding octahedral MLe complex and a tetrahedral ML complex.

Answer 1

a)The complex have Oh point group symmetry.

b)since the3p orbitals are all pointing directly towards the negative pointcharges of the ligands (that would be on the x,y, and z axis of anoctahedral structure) theoretically the repulsive forces would besimilar to a dz^2 or dx^2-y^2 orbital. So all of the 3p orbitals,each being aligned with an axis would be the same energy level, so?o shouldbe 0 in the crystal field splitting diagram

c and d are given in image.
obidals in octakidhalComk e dtzdz o.4x4) -o-ysd Cente chey dyz drhr dz Symshio

Spihng 2d ori tado i terakoo mp hp fup dny dyzdtn d2

Aha mamituoe i's Gmplix for tetraheshoap unld 4o then he Dt