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What causes dark colours in tetrahedral complexes?
Accepted Answer
Dark colors in tetrahedral complexes are often due to the presence of d-d transitions. Tetrahedral complexes have a lower symmetry than octahedral complexes, leading to a smaller splitting of the d-orbitals. This smaller splitting results in transitions between the d-orbitals falling within the visible light spectrum, leading to the absorption of certain wavelengths and the appearance of complementary colors.
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