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A Germanate with a Collapsible Open-Framework
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Number of Authors: 4
2016 (English)In: Crystal Growth & Design, ISSN 1528-7483, E-ISSN 1528-7505, Vol. 16, no 12, 6967-6973 p.Article in journal (Refereed) Published
Abstract [en]

A novel open-framework germanate, vertical bar NC2H8 vertical bar vertical bar N2C6H18 vertical bar, [Ge7O14.5F2].4H(2)O denoted SU-65 (SU = Stockholm University), with 24-ring channels and a very low framework density of 8.9 Ge atoms per 1000 angstrom(3) was synthesized under hydro-solvothermal conditions. The framework of SU-65 is built of 5-connected Ge-7 clusters decorating the fee net and is a framework orientation isomer to ASU-16. Half of the 8- and 12-rings in ASU-16 are instead 10-rings in SU-65 due to the different orientations of half of the clusters in the crystal structure. Flexibility of the frameworks is also influenced by the orientation of the clusters. The unique unit cell angle in SU-65 changes upon heating, unlike ASU-16 which only undergoes changes in unit cell lengths. SU-65 undergoes significant structural changes at 180 degrees C in a vacuum, forming SU-65ht. The crystal structure of SU-65ht was investigated by rotation electron diffraction, X-ray powder diffraction, and infrared spectroscopy. Through these techniques it was deduced that SU-65ht has similar clusters, symmetry, and topology as SU-65, but one of the unit cell lengths is shortened by approximately 5 A. This corresponds to a 22% decrease in unit cell volume.

Place, publisher, year, edition, pages
2016. Vol. 16, no 12, 6967-6973 p.
Keyword [en]
POWDER STRUCTURAL-CHARACTERIZATION, INTERCONNECTED 12-RING CHANNELS, CRYSTALLINE INORGANIC SOLIDS, SITU X-RAY, BUILDING UNITS, ZEOLITE-BETA, 24-RING CHANNELS, MOLECULAR-SIEVES, METAL-COMPLEX, DIFFRACTION
National Category
Chemical Sciences Materials Engineering
Identifiers
URN: urn:nbn:se:su:diva-137583DOI: 10.1021/acs.cgd.6b01150ISI: 000389624200036OAI: oai:DiVA.org:su-137583DiVA: diva2:1063359
Available from: 2017-01-10 Created: 2017-01-09 Last updated: 2017-01-10Bibliographically approved

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Inge, A. KenWillhammar, TomZou, Xiaodong
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