chemistry·NCERT Class 12·Coordination Compounds
Coordination Complex & CFT
Hard+80 XP
[Fe(H₂O)₆]³⁺ is pale yellow but [Fe(CN)₆]³⁻ is deep red. The difference? Strong vs weak field ligands change how d orbitals split — and what colour light gets absorbed.
›CFSE = crystal field stabilisation energy; larger Δ = more stable complex.
›Colour: complex absorbs a complementary colour to the one seen.