Choose the most likely pattern for the crystal field diagram for the complex trans-[Ni(NH₃)₂(CN)₄]²^- where CN^- produces a much stronger crystal field than does NH₃.

Question

Quizplus · Accepted Answer

The CN ligand produces a stronger crystal field compared to the NHS ligand. Therefore, the d-orbitals of Ni will split more in the presence of CN ligand compared to NHS ligand. As a result, the d-orbitals eg and t2g will split further apart. The trans geometry means that the CN ligand will be on the z-axis which would cause dxy and dx2-y2 orbitals to have the same energy. Therefore, the most likely pattern for the crystal field diagram would be eg < t2g < dx2-y2 = dxy < dz2. This matches the pattern in choice B.

Choose the Most Likely Pattern for the Crystal Field Diagram