Electronic Spectra of [Ti(H₂O)₆]⁺³ Complex Ion

Electronic Spectra of [Ti(H₂O)₆]⁺³ Complex Ion

There is only one electron in d-orbital of Ti⁺³ ion (d¹ system). Therefore, the spectroscopic term for the ground state of Ti⁺³ ion is ²D. In the ground state the single electron occupy the lower t_2g orbital. on absorption of radiation the electron gets excited to e_g orbitals. The corresponding description of the t_2g¹ and e_g¹ configurations are T_2g and E_g.

Consequently the absorption spectrum of d¹ system (i.e. Ti⁺³ ion) shows only one band due to ²E_g ← ²T_2g transition.
The absorption band in the spectra of aqueous Ti⁺³ ion is broad and unsymmetrical due to L-S coupling in ground state and J-T distortion in excited state.

In [Ti(H₂O)₆]⁺³ Complex Ion, absorption maximum observed at 20300cm⁻¹ (4900Å) and also the absorption maximum has a shoulder at 17400cm⁻¹ due to J-T distortion. This shoulder is responsible for broad band in the spectrum.

Electronic Spectra of [Cu(H₂O)₆]⁺² Complex Ion