Synthesis, structure and properties of a three-dimensional porous rare-earth carboxylate MIL-83(Eu): Eu2(O2C-C10H14-CO2)3

Abstract

A new three-dimensional rare-earth(III) dicarboxylate, MIL-83(Eu) or Eu₂(O₂C-C₁₀H₁₄-CO₂)₃, has been obtained under hydrothermal conditions from aqueous mixtures of europium nitrate and 1,3-adamantanedicarboxylic acid. Its three-dimensional structure consists of chains built up from face-sharing nine-coordinated rare-earth(III) polyhedra connected by the 1,3-adamantanedicarboxylate linkers, delimiting anhydrous porous channels. This structure is understood by comparison with the already known hybrid rare-earth(III)carboxylates. The thermal behavior of the solid has been investigated using TGA and X-ray thermodiffractometry and shows that the title solid is stable up to 300 °C. Finally, the study of the luminescence properties of the yttrium(III) form of MIL-83(Y/Eu) doped with europium(III) reveals a significant red-emission upon VUV radiation.