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Why are different colours observed in oc...

Why are different colours observed in octahedral and tetrahedral complexes for the same metal and same ligands ?

Text Solution

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`Delta_(t)=((4)/(9))Delta_(0)`. Thus, `Delta_(t)` is smaller than `Delta_(o)`. Hence, less energy (higher wavelength) is absorbed by tetrahedral complexes than by octahedral complexes of the same metal and ligands. Therefore, the observed colours are different.
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