Questions/Coordination Compounds/Why does anhydrous ...
Colour & Electronic ConfigCoordination Compounds

Why does anhydrous CuSO4CuSO_4 appear white, while hydrated CuSO45H2OCuSO_4 \cdot 5H_2O is blue?

Expert Answer

Anhydrous Cu2+Cu^{2+} lacks ligands to cause crystal field splitting (no d-d transition). Hydrated form has water ligands causing splitting and d-d transitions.

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