The colour of the coordination compounds depends on the crystal field splitting. What will be the correct order of absorption of wavelength of light in the visible region, for the complexes, [Co(NH 3 ) 6 ] 3+ , [Co(CN) 6 ] 3– , [Co(H 2 O) 6 ] 3+

Question

Philoid · Accepted Answer

According to the spectrochemical series the increasing order of field strength is H₂O3-. So, greater the field strength, greater is the crystal field splitting and the energy difference between t_2g and e_g orbitals will be higher. If the energy is higher, then the wavelength will be smaller.

E=

Energy(E) and wavelength(λ) are inversely related. So, the order in which the ligands absorb wavelength will be the reverse of the spectrochemical series.

H₂O>NH₃>CN^-

So, from the above explanation we can conclude that Option C is the correct answer.

The colour of the coordination compounds depends on the crystal field splitting. What will be the correct order of absorption of wavelength of light in the visible region, for the complexes, [Co(NH3)6]3+, [Co(CN)6]3–, [Co(H2O)6]3+

The colour of the coordination compounds depends on the crystal field splitting. What will be the correct order of absorption of wavelength of light in the visible region, for the complexes, [Co(NH₃)₆]³⁺, [Co(CN)₆]^3–, [Co(H₂O)₆]³⁺