Indium triflate is a complex inorganic compound of indium, fluorine, carbon, sulphur, and oxygen with the chemical formula (CF3SO3)3In. This is the indium salt of trifluoromethanesulphonic acid. As a water-stable Lewis acid, the compound is a practical catalyst and finds wide application in organic synthesis.
Physical properties The compound forms a white, powdery solid. It is a Lewis acid, but unlike most other such compounds, it is not very sensitive to hydrolysis and is stable in aqueous solution. It is soluble in organic solvents like acetonitrile and dichloromethane, but often reported as sparingly soluble in hydrocarbons.
Synthesis Indium triflate is typically synthesized by reacting indium(III) oxide with trifluoromethanesulfonic acid in water:
In2O3 + 6HOTf → 2In(OTf)3 + 3H2O The compound is then isolated by filtering off excess oxide and evaporating the water.
Uses The compound serves as a catalyst and in synthesis of stable indium bacteriochlorins.
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