Question

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

Answer 1

hi friend.....

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.

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(NH3)5]2+

535

Yellow

Violet

[Co(NH3)5(H2O)]3+

500

Blue-green

Red

[Co(NH3)6]3+

475

Blue

Yellow-orange

[Co(CN)6]3−

310

Ultraviolet

Pale yellow

[Cu(H2O)4]2+

600

Red

Blue

[Ti(H2O)6]3+

498

Blue-green

Purple...

hope this helps u...