title: Novel microporous europium and terbium silicates.
abstract: The synthesis and structural characterization of the first examples of microporous europium(III) and terbium(III) silicates (Na(4)K(2)X(2)Si(16)O(38) x 10H(2)O, X = Eu, Tb) are reported. The structure of these solids was solved by powder X-ray diffraction ab initio (direct) methods and further characterized by chemical analysis (EDS), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), (23)Na and (29)Si magic-angle spinning (MAS) NMR, and luminescence spectroscopy. Both materials display interesting photoluminescence properties and present potential for applications in optoelectronics. This work illustrates the possibility of combining in a given silicate microporosity and optical activity.
authors.affiliation: Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.
authors.forename: D
authors.initials: D
authors.lastname: Ananias
authors.forename: A
authors.initials: A
authors.lastname: Ferreira
authors.forename: J
authors.initials: J
authors.lastname: Rocha
authors.forename: P
authors.initials: P
authors.lastname: Ferreira
authors.forename: J P
authors.initials: JP
authors.lastname: Rainho
authors.forename: C
authors.initials: C
authors.lastname: Morais
authors.forename: L D
authors.initials: LD
authors.lastname: Carlos