A STRONGLY LUMINESCENT ORGANIC-SOLVENT-SOLUBLE SALT OF THE TRIS(DIPICOLINATO)EUROPIUM(III) TRIANION

The tetraethylammonium salt of the [EU(dipic)(3)](3-) (dipic = 2, 6-pyridinedicarboxylate) complex anion, tris(tetraethylammonium) tris(2, 6-pyridinedicarboxylato-N,O,O '')europium(III) tetrahydrate, (C8H20N)(3) [EU-(C7H3NO4)3].4H(2)O, forms monoclinic crystals. The lattice contains alternating columns of the Delta and Lambda enantiomeric forms of the trianion, with the water molecules hydrogen bonded to the uncoordinated O atoms of the carboxylate groups and the tetraethylammonium cations forming columns, presumably to optimize electrostatic attractions.