[Fe(CN)6] 4- and [Fe(H2O)6] 2+ are of different colours in dilute solutions. Why?
The color of a selected coordination compound relies upon at the significance of the crystal-subject splitting power, Δ. This CFSE in flip relies upon on the character of the ligand. In case of [Fe(CN)6] 4- and [Fe(H2O)6] 2 , the color differs due to the fact there may be a distinction withinside the CFSE. Now, CN - is a sturdy area ligand having a better CFSE price as compared to the CFSE price of water. This approach that the absorption of strength for the intra d-d transition additionally differs. Hence, the transmitted color additionally differs.
