What Is the Value of CFSE for Ni and How Is It Calculated
What is CFSE and Why It Matters
Crystal Field Stabilization Energy (CFSE) is the extra stability a transition metal complex gains due to the arrangement of its d-electrons in a ligand-induced electric field. When ligands approach a metal center, the degeneracy of d-orbitals splits into different energy levels. The electrons occupy these orbitals according to Hund’s rule and the Pauli principle, resulting in a net stabilization or sometimes destabilization.
In simple terms, CFSE explains why certain complexes are more stable than others, why metals adopt specific geometries, and how their magnetic and spectral properties emerge. For Ni, which commonly exists as Ni²⁺ with a d⁸ configuration, CFSE helps predict whether a complex will prefer octahedral, tetrahedral, or square planar arrangements.
