Fluorescence of fullerene C70 in ionic liquids

► Fullerene C70 dissolves in ionic liquids bearing long alkyl chains (C8 or higher). ► The fluorescence properties of C70 in ILs are similar to those observed in conventional polar solvents. ► Fluorescence of fullerene C70 is completely quenched when chloride is present as the counter ion. ► Fluorescence decay analysis using a sum of Becquerel functions to account for the background emission of the ionic liquids allowed to successfully recover the solute's lifetime.