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Chemistry in Pictures: Fluorescent europium

June 18, 2021

A blue-ish purple glow from a powder in a vial.

Credit: Leo S

Reddit user “Leo S” is on a mission. “My goal right now is to make as many europium compounds as I possibly can to document the color that they luminesce, and what the crystals look like,” Leo writes. Up top in this post is europium(III) hydroxide, Eu(OH)₃. To make this sample, he placed elemental europium in water, where it immediately reacted to form a water-insoluble powder. Leo also made and photographed europium(III) acetate, Eu(CH₃COO)₃; europium citrate, EuC₆H₅O₇; and europium(III) chloride hexahydrate, EuCl₃ • 6H₂O. So far the project—and the images—are looking great, but Leo says in some ways, we’re missing out: “Much prettier in person!”.