Practicing Success
The complex exhibits the lowest energy absorption band is: |
[NiCl4]2– [Ni(CO)4] [Ni(CN)4]2– [Ni(H2O)6]2+ |
[NiCl4]2– |
The complex that exhibits the lowest energy absorption band is [NiCl4]2–. This is because Cl– is a weak field ligand, which means that it does not split the d orbitals of the Ni2+ ion very much. This results in a low crystal field splitting energy (Δo), which corresponds to a low energy absorption band. The other complexes in the answer choices have stronger field ligands, which results in a higher Δo and a higher energy absorption band. So the answer is (a) [NiCl4]2–. |