Dissolve the waxy ionophore (ca 60g) in CHCl3 (200mL), wash it with H2O (3 x 200mL), dry it and evaporate it to dryness, then distil it in a vacuum. A waxy solid is formed on cooling the distillate. UV: max 257nm ( 1.86 x 103 M-1cm -1), 308nm ( 1.7 x 102 M-1cm -1). [IR, NMR UV: Valenty et al. Inorg Chem 18 2160 1979.]
