Double-Keggin-type anion-templated synthesis of a 3D porous coordination polymer of Eu(III) ions and dpdo ligands

Abstract

A porous coordination polymer, {[Eu(dpdo)4(H2O) 3]H(SiMo12O40)(dpdo)0.5(CH 3CN)0.5(H2O)4}n (1), (where dpdo is 4,4′-bipyridine-N,N′-dioxide) templated by double-Keggin-type polyanions has been synthesized through the self-assembly of Eu(III) ions and dpdo in acetonitrile/water solution and structurally characterized by elemental analysis, IR spectra and single crystal X-ray diffraction. The X-ray structure analysis reveals that compound 1 exhibits a 3D non-interwoven framework with large cavities housing centro-symmetrically related shoulder-by-shoulder double-Keggin anions as guests. The result of a thermogravimetric analysis suggests that the metal-organic framework has high thermal stability. © 2008 Verlag der Zeitschrift für Naturforschung.