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Aparna Das from O.P. JINDAL SCHOOL, asked a question
Subject: Chemistry , asked on 27/8/12

what 's d-d transition?please explain in terms of color change in detail

EXPERT ANSWER

, Meritnation Expert added an answer, on 28/8/12

The d-orbitals in the transition elements do not have same energy in their complexes. Under the influence of the ligands attached, the d-orbitals splits into two sets of orbitals having slighty different energies. In transition elements which have partly filled  d-orbitals, the transition of electron can take place from one of the lower  d-orbitals to some higher  d-orbitals within the same subshell.

The energy required for this transition falls in visible region. So when white light falls on these complexes they absorb a particular colour from the radiation for the promotion of electron and remaining colours are emitted.The colour of complex is due to this emitted radiation.

  • The relationships between the wavelength of light absorbed and the colour observed in some coordination entities are listed in the given table.

Coordination entity

Wavelength of light absorbed (nm)

Colour of light absorbed

Colour of coordination entity

[CoCl(NH 3 ) 5 ] 2+

535

Yellow

Violet

[Co(NH 3 ) 5 (H 2 O)] 3+

500

Blue-green

Red

[Co(NH 3 ) 6 ] 3+

475

Blue

Yellow-orange

[Co(CN) 6 ] 3−

310

Ultraviolet

Pale yellow

[Cu(H 2 O) 4 ] 2+

600

Red

Blue

[Ti(H 2 O) 6 ] 3+

498

Blue-green

Purple

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