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2017-06-25 at 2:25 AM UTCWe Europium now.
"Triangular luminescent box: Self-assembly of a new multidentate receptor with europium cations results in the formation of trinuclear discrete complexes. X-ray crystallography shows that nine-coordinate cations are linked by ligands to provide a triangular complex in the solid state and in solution. Despite the coordinated solvent molecules, this topologically unusual complex exhibits remarkable luminescent properties."
http://onlinelibrary.wiley.com/doi/10.1002/chem.200802676/full
https://www.newscientist.com/article/mg18624944-800-look-out-for-giant-triangles-in-space/