Both [Mn(H2O)6]2+
and [FeF6]3- have a d5 configuration
and high-spin complexes, but electronic transitions are not only
Laporte-forbidden, but also spin-forbidden. thus the dilute solutions of Mn2+
and Fe +3 complexes are colorless.
Important Note:
For
first transition series d5 system,
weak ligand field , and coordination number six (6) Complexes are found to be
colourless due to violation of selection rule.
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