SU-12: a silicon-substituted ASU- 16 with circular 24-rings and templated by a monoamine
2005 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 17, no 10, 2530-2536 p.Article in journal (Refereed) Published
A new silicogermanate, SU-12, |(CH3CH2CH2NH3)3(H2O)2.5|[(Ge6.44Si0.56)O14.5F2], with 24-ring channel systems was synthesized under hydro/solvothermal conditions, and its structure was determined by single-crystal X-ray diffraction. It is the first silicogermanate with extra-large 24-rings templated by a primary monoamine. Crystallographic data: tetragonal, space group I2m, unit cell parameters a = 27.6460(22) Å and c = 17.0885(14) Å, V = 13060.8(17) Å3, Z = 16, ρcalcd = 1.797 g/cm3, R1 = 0.0512 [5471 observed reflections with I > 2σ(I)], wR2 = 0.1487, S (goodness-of-fit on F2) = 1.08. SU-12 has a structure topology similar to that of the pure germanate ASU-16. However, the symmetry of SU-12 is higher than that of ASU-16, and the 24-rings become more circular than those in ASU-16. The interaction between the templates and framework is compared for ASU-16 and SU-12, and their thermal stabilities are studied. The orthorhombic ASU-16 is thermally less stable than the tetragonal SU-12 and transformed to SU-12 by heating. The ion-exchange property of SU-12 is also studied.
Place, publisher, year, edition, pages
American Chemical Society , 2005. Vol. 17, no 10, 2530-2536 p.
IdentifiersURN: urn:nbn:se:su:diva-23659DOI: 10.1021/cm049373fOAI: oai:DiVA.org:su-23659DiVA: diva2:193887
Part of urn:nbn:se:su:diva-4402005-04-052005-04-052011-01-31Bibliographically approved