Speciation of indium(iii) chloro complexes in the solvent extraction process from chloride aqueous solutions to ionic liquids

Indium(iii) exists as octahedral mixed complexes, [In(H₂O)_6−nCl_n]³⁻ⁿ (0 ≤ n ≤ 6), in acidic chloride media. After extraction, only the tetrahedral [InCl₄]⁻ complex is present in the ionic liquid phase.