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Hydroxometalates from Anion Exchange Reactions of [BF4] based Ionic Liquids: Formation of [M(OH)6)]2− (M = Ti, Zr) and [Zr(OH)5]

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journal contribution
posted on 28.12.2010, 00:00 by Hechun Lin, Peter W. de Oliveira, Volker Huch, Michael Veith
The hydrolysis reactions of Ti(OiPr)4 in the presence of different ionic liquids using ethanol as solvent were investigated. The reaction in the presence of [BMIM][BF4] gave rise to the anion exchange reaction product [BMIM]2[Ti(OH)6] in moderate yield. On the contrary, Ti7O4(OEt)20 was obtained in ionic liquids with other anions. The anion exchange reaction has a broad capacity for group functionalization. It can be used to synthesize both imidazolium and pyridium [Ti(OH)6]2− salts. In contrast, under the similar reaction conditions, the reactions of zirconium alcoholate gave rise to [Zr(OH)5] or [Zr(OH)6]2− intermediates depending on the counter cations. Under the solvothermal reaction conditions, [PF6] based ionic liquids can also undertake the similar anion exchange reactions.