[Fe(CN)6]4- and [Fe(H2O)6]2- are of different colours in dilute solu – InterviewSolution

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1.	[Fe(CN)6]4- and [Fe(H2O)6]2- are of different colours in dilute solutions. Why?
Answer» The colour of a particular coordination compound depends on the magnitude of crystal field splitting energy ∆. This CFSE in turn depends on the nature of the ligand. In case of [Fe (CN)₆)^4- and [Fe(H₂O)₆]^2- the colour differs because there is a difference in the CFSE. Now, CN^- is a strong field ligand having a higher CFSE value as compared to the CFSE value of water. This means that absorption of energy for the extra d- d transition also differed. Hence, the transmitted colour also different.

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