[Ti (H2O)6]2+ is purple in colour. Prove this statement.

1.	[Ti (H2O)6]2+ is purple in colour. Prove this statement.
Answer» (i) In [Ti (H₂O)₆ ]²⁺ , the central metal ion is Ti³⁺ which has d¹configuration. This single electron occupies one of the t_tg orbitals in the octahedral aqua ligand field. (ii) When white light falls on this complex, the d electron absorbs light and promotes itself to eg level. (iii) The spectral data show the absorption maximum is at 20000 cm^-1 corresponding to the crystal field splitting energy (∆₀) 239.7 kJ mol^-1 . The transmitted colour associated with this absorption is purple and hence the complex appears in purple in colour.

Answer»

(i) In [Ti (H₂O)₆ ]²⁺ , the central metal ion is Ti³⁺ which has d¹configuration. This single electron occupies one of the t_tg orbitals in the octahedral aqua ligand field.

(ii) When white light falls on this complex, the d electron absorbs light and promotes itself to eg level.

(iii) The spectral data show the absorption maximum is at 20000 cm^-1 corresponding to the crystal field splitting energy (∆₀) 239.7 kJ mol^-1 . The transmitted colour associated with this absorption is purple and hence the complex appears in purple in colour.

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