To a beaker add 5.02 g of dibenzoylmethane, 3.10 mL of triethylamine and 170 mL of ethanol, with stirring add 1.4g of europium(III) chloride dissolved in 30 mL of ethanol. Cool the mixture in a freezer, filter, wash with some ethanol and recrystallize the powder in acetone.
The mixture after the addition of the europium salt
The product under UV-light
The recrystallized product
The recrystallized product under UV-light