Three new europium(III) methanetriacetate metal-organic frameworks: the influence of synthesis on the product topology

Three new metal-organic framework structures containing Eu^III and the little explored methanetriacetate ligand (mta^3-) have been synthesized. Gel synthesis yields a two-dimensional framework with the formula [Eu(mta)(H₂O)₃]_n·2nH₂O, while two polymorphs of the three-dimensional framework [Eu(mta)(H₂O)]_n·nH₂O are obtained through hydrothermal synthesis at either 423 or 443 K.