- Email: [email protected]
05-P-12 - synthesis and characterisation of novel microporous framework cerium and europium silicates
246
05-P-12 - Synthesis and characterisation of novel microporous framework cerium and europium silicates D. Ananias (a), P. Ferreira (a), A. Ferreira (a), J. Rocha (a), J.P. Rainho (a,b), C.M. Morais (a) and L.D. Carlos (b)
a Department of Chemistry, University of Aveiro, 3810 Aveiro, Portugal b Department of Physics, University of Aveiro, 3810 Aveiro, Portugal The synthesis, structural characterization and luminescence spectroscopy studies of AV-5 and AV-9 (Aveiro microporous solids no. 5 and 9), the first examples of microporous framework cerium(III) and europium(III) silicates (Na4KzX2Si16038"10H20, X = Eu, Ce) are reported. Both materials display interesting photoluminescence properties and present potential for applications in optoelectronics. This work illustrates the possibility of combining in a given framework silicate microporosity and optical activity.
05-P-13 - Novel microporous framework stannosilicates Z. Lin and J. Rocha
Department of Chemistry, University of Aveiro, 3810 Aveiro, [email protected], Portugal Reactions in the R20 - S n O 2 - S i O 2 - H 2 0 (R = Na, K) system have been studied under mild hydrothermal conditions (170 - 230 ~ Synthesis variables such as time, temperature and the HzO/Sn, Si/Sn, K/Sn, K/Na and OH/Sn ratios have been investigated. Two novel microporous framework stannosilicates, AV-6 and AV-7, have been prepared. These materials possess corner-sharing [SnO6] octahedra and [SiO4] tetrahedra forming threedimensional frameworks, with no Sn-O-Sn-O chains, stable up to ca. 700 and 450 ~ respectively. After calcination of AV-6 and AV-7 for 5 hours at 900 and 1000 ~ respectively, a new phase (AV-11) forms. At higher temperature, AV-11 converts to a wadeite type structure. The materials have been characterized by SEM, powder XRD, 298i and l l9Sn MAS NMR and TGA.
0 5 - P - 1 4 - Magadiite intercalated MCM-22 M. Munsignatti, A.J.S. Mascarenhas, A.L.S. Marques and H.O. Pastore*
Grupo de Peneiras Moleculares Micro- e Mesoporosas, Instituto de Quimica, Universidade Estadual de Campinas, CP 6154, CEP 13083-970, Campinas, SP, Brasil. E-mail adress: lolly@iqm, unicamp, br MCM-22 precursor samples were prepared with magadiite. The layered assembly was intercalated with CTABr/TPAOH, sonicated, Soxhlet extracted and calcined. The material was characterized by XRD, pore analysis, SEM, FTIR, elemental analysis and DTG. The samples obtained appear to be the result of magadiite layers intercalated at least partially, between MCM-22 layers.
05-P-12 - Synthesis and characterisation of novel microporous framework cerium and europium silicates D. Ananias (a), P. Ferreira (a), A. Ferreira (a), J. Rocha (a), J.P. Rainho (a,b), C.M. Morais (a) and L.D. Carlos (b)
a Department of Chemistry, University of Aveiro, 3810 Aveiro, Portugal b Department of Physics, University of Aveiro, 3810 Aveiro, Portugal The synthesis, structural characterization and luminescence spectroscopy studies of AV-5 and AV-9 (Aveiro microporous solids no. 5 and 9), the first examples of microporous framework cerium(III) and europium(III) silicates (Na4KzX2Si16038"10H20, X = Eu, Ce) are reported. Both materials display interesting photoluminescence properties and present potential for applications in optoelectronics. This work illustrates the possibility of combining in a given framework silicate microporosity and optical activity.
05-P-13 - Novel microporous framework stannosilicates Z. Lin and J. Rocha
Department of Chemistry, University of Aveiro, 3810 Aveiro, [email protected], Portugal Reactions in the R20 - S n O 2 - S i O 2 - H 2 0 (R = Na, K) system have been studied under mild hydrothermal conditions (170 - 230 ~ Synthesis variables such as time, temperature and the HzO/Sn, Si/Sn, K/Sn, K/Na and OH/Sn ratios have been investigated. Two novel microporous framework stannosilicates, AV-6 and AV-7, have been prepared. These materials possess corner-sharing [SnO6] octahedra and [SiO4] tetrahedra forming threedimensional frameworks, with no Sn-O-Sn-O chains, stable up to ca. 700 and 450 ~ respectively. After calcination of AV-6 and AV-7 for 5 hours at 900 and 1000 ~ respectively, a new phase (AV-11) forms. At higher temperature, AV-11 converts to a wadeite type structure. The materials have been characterized by SEM, powder XRD, 298i and l l9Sn MAS NMR and TGA.
0 5 - P - 1 4 - Magadiite intercalated MCM-22 M. Munsignatti, A.J.S. Mascarenhas, A.L.S. Marques and H.O. Pastore*
Grupo de Peneiras Moleculares Micro- e Mesoporosas, Instituto de Quimica, Universidade Estadual de Campinas, CP 6154, CEP 13083-970, Campinas, SP, Brasil. E-mail adress: lolly@iqm, unicamp, br MCM-22 precursor samples were prepared with magadiite. The layered assembly was intercalated with CTABr/TPAOH, sonicated, Soxhlet extracted and calcined. The material was characterized by XRD, pore analysis, SEM, FTIR, elemental analysis and DTG. The samples obtained appear to be the result of magadiite layers intercalated at least partially, between MCM-22 layers.