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1. metal to ligand charge transfer transition
2. ligand to metal charge transfer transition
3. spin allowed and Laporte forbidden d-d transition
4. spin allowed and Laporte allowed d-d transition
The blue color of [CoCl4]2- is due to its absorption of light in the visible region, particularly in the red end of the spectrum. As a result, the transmitted light appears blue to our eyes. This color is a result of the electronic transitions in the complex caused by the splitting of the d-orbitals in the presence of the chloride ligands.
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Why CoCl4 2 shows a deep blue colour?
because of spin allowed d-d laporte allowed transition
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If you mix equal parts of the primary colors Yellow and Blue, you will get the secondary color Green. If you mix 2 parts Yellow and 1 part Blue, you will get the tertiary color Yellow-green. If you mix 2 parts Blue and 1 part Yellow, you will get the tertiary color Blue-green.
Why CoCl4 2 shows a deep blue colour?
because of spin allowed d-d laporte allowed transition
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