Question

Explain in detail, "Colour in co-ordination compounds.“

Answer 1

It has been observed that coordination compounds exhibit a wide range of colors. The coloration of opaque substances is due to the absorption of a particular wavelength of the visible light falling on their surface by those opaque substances. This means that coordination compounds absorb some of the visible spectra from white light when it falls on its surface. The spectrum of light reflected by them doesn’t contain the color of a wavelength that was absorbed by the substance. Hence, we observe the color of the coordination compound to be complimentary of the color absorbed by it.

The coloration of coordination compounds can be explained with the help of crystal field theory. Generally, d orbitals are degenerate that is all the orbitals have the same energy level in the absence of ligands.

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