Chloroaluminate ionic liquids as reagents for isolating soluble hexanuclear zirconium halide cluster compounds

Area of Science:

• Inorganic Chemistry
• Materials Science
• Solution Chemistry

Background:

• Hexanuclear zirconium halide clusters are complex inorganic compounds.
• Synthesizing and isolating these clusters from solid-state precursors can be challenging.
• Molten salts offer unique solvent properties for studying reactive inorganic species.

Purpose of the Study:

• To develop a method for isolating centered hexanuclear zirconium halide clusters.
• To utilize ambient-temperature molten salts as effective solvents for cluster synthesis.
• To characterize novel carbon- and manganese-centered zirconium halide clusters.

Main Methods:

• Employing ambient-temperature chloroaluminate molten salts (AlCl3/ImCl) as reaction media.
• Dissolving high-temperature synthesized cluster precursors (KZr6CCl15, Li2Zr6MnCl15) in basic molten salts.
• Utilizing oxidation with ferrocenium tetrafluoroborate for cluster modification.

Main Results:

• Isolation of the C-centered cluster Im4Zr6CCl18 in 70% yield.
• Isolation of the Mn-centered cluster Im5Zr6MnCl18.C7H(8).2CH3CN in 54% yield.
• Successful isolation of the one-electron-oxidized B-centered cluster [(Zr6B)Cl18]4- (as Im4Zr6BCl18) in 90% yield.

Conclusions:

• Ambient-temperature chloroaluminate molten salts are effective solvents for isolating hexanuclear zirconium halide clusters.
• This method allows for the recovery of previously difficult-to-access cluster compounds.
• The study demonstrates the potential for further functionalization and isolation of related cluster systems.