Question

Why transition metal complexes are coloured?

Answer 1

To Increase Their Resistivity Towards Corrosion

Answer 2

Transition metal complexes are coloured due to d-d transition

Explanation:

• Before the attack on metal ion,its d-orbital are degenerate.i.e. have same energy.

• When a external agent attack on the central metal ion,the degeneracy is broken and split into two set of orbitals t2g(having low energy) and eg(having high energy) .

• When unpaired electron are present in the low energy level and U.V or visible light is incident on the compound,the electron from t2g to eg.

• Since,the energy of electron increases in the high energy level so it becomes unstable and comes back to the low energy level releasing energy of wavelength within the visible range.

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