Why is [Ti(H2O)6)] 3+ violet in colour ?

In [Ti(H₂O)₆)]³⁺, Ti³⁺ ion has only one electron in 3d-orbital. The electron occupies the orbital of the lowest energy, i.e., any one of the degenerate t_2g orbitals. The violet/purple colour of [Ti(H₂O)₆)]³⁺ ion is due to absorption of blue-green light and transition of electron of the t_2g orbitals to one of the degenerate e_g ortibals. The absorption spectrum of [Ti(H₂O)₆)]³⁺ reveals that the d-d transition occurs with a single broad peak.