Question

What are d-d and f-f transition? How do they differ?

Answer 1

Answer:

d-d transition: In a d d transition an electron in a d orbital on a metal is excited by a Photon to another d orbital of higher energy. in complexes of the transition metals the d orbitals do not have the same energy in centrosymmetric complexes DD transitions are forbidden by the Laporte rule.

f-f transition : the transition of an electron from a f orbital which is lower in energy to another f orbital which is higher in energy is defined as a f f transition.

Answer 2

The d-d and f-f transition and they differ

Explanation:

• A d-d transition means a shifting of electrons between the lower energy d orbital to a higher energy d orbital by absorption of energy and vice versa.
• The transition of an electron from an f orbital which is lower in energy to an f orbital which is higher in energy is defined as a f-f transition.

• It has been noted that the colours of lanthanide complexes originate mostly from such charge transfer interactions.
• These transition can be brought about by the absorption of radiation from the visible light and transmission of the complementary colour. The compound thus looks coloured.

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