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[Fe(CN)6)]^(4-) and [Fe(H2O)6)]^(2+) ...

`[Fe(CN)_6)]^(4-)` and `[Fe(H_2O)_6)]^(2+)` are of different colours in dilute solutions. Why ?

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The colour of a particular coordination compound depends on the magnitude of the crystal-field splitting energy `Delta` . This CFSE in turn depends on the nature of the ligand. In case of `[Fe(CN)6]^(4-)` and `[Fe(H_(2)O)_(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 the absorption of energy for the intra d-d transition also differs. Hence, the transmitted colour also differs.
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