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SU-57 – An aluminosilicogermanate with a DFT topology and variable compositions
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK), Inorganic and Structural Chemistry.
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK), Inorganic and Structural Chemistry.
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2009 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, Vol. 117, no 1-2, 285-291 p.Article in journal (Refereed) Published
Abstract [en]

An aluminosilicogermanate with a DFT zeotype framework (denoted as SU-57) was synthesized for the first time by ethanol-assisted hydrothermal synthesis at 160 and 170 °C. The compound was characterized by single crystal and powder X-ray diffraction, scanning and transmission electron microscopy, energy dispersive spectroscopy (EDS), thermogravimetry (TG) and solid state nuclear magnetic resonance (NMR) spectroscopy. SU-57 crystallizes in space group P42/n with estimated a ≈ 10.38–10.46 Å, c ≈ 8.88–8.91 Å, V ≈ 957–975 Å3. It has variable Al–Si–Ge composition with an approximate formula |C2H10N2| [Al(SixGe1−x)O4]2 (x ≈ 0.3–0.9), which results in a super-structure originated from different cation occupancies of the two unique tetrahedral (T) sites. Single crystal X-ray structure refinements, together with results from X-ray powder diffraction (XRPD) and EDS analysis, showed that (i) the AlO4 and (Si, Ge)O4 tetrahedra are only partially ordered over the DFT framework and do not follow a strict alternating manner. (ii) Al resides predominantly on one T site and Si and Ge predominantly on the other. (iii) The Al cation concentration (Al/(Al + Si + Ge)) is nearly constant and slightly less than 50 at%, while the Si and Ge cation concentrations vary over a large range. (iv) Al and Ge occupy both T sites. The cation disorder was confirmed by 27Al and 29Si solid state NMR. TG analysis and in situ XRPD showed that SU-57 was stable up to 375 °C in N2 atmosphere.

Place, publisher, year, edition, pages
2009. Vol. 117, no 1-2, 285-291 p.
Keyword [en]
Aluminosilicogermanate, DFT zeotype, Hydrothermal synthesis, X-ray diffraction, Energy dispersive spectroscopy, 27Al and 29Si solid state NMR
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:su:diva-24858DOI: 10.1016/j.micromeso.2008.06.036ISI: 000262879700037OAI: oai:DiVA.org:su-24858DiVA: diva2:198430
Available from: 2008-04-24 Created: 2008-04-24 Last updated: 2011-09-20Bibliographically approved
In thesis
1. Open-Framework Germanates: Crystallography, structures and cluster building units
Open this publication in new window or tab >>Open-Framework Germanates: Crystallography, structures and cluster building units
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is focussing on the crystallographic challenges and what knowledge we can gain from studying the different open-framework germanates. Five new open-framework germanates have been synthesized and the structures have been determined by single crystal X-ray diffraction. A thorough description is made of the different problems raised with the different compounds, whether it is choice of crystal system in SU-61, twinning and possible ordering in SU-46, superstructure and variation in elemental content in SU-57, template disorder in JLG-5 or framework disorder in SU-44.

Open-framework germanates are often built from one type of cluster, such as the Ge7 [Ge7X19], Ge8 [Ge8X20], Ge9 [Ge9Xn, n =25-26] and Ge10 [Ge10X28], (X =O, OH, F) clusters. The structures built by clusters containing different kinds of polyhedra are discussed, with a focus on the 4-coordinated Ge7 clusters, the larger cluster aggregate found in SU-8 and SU-44 and the structures built by the Ge10 clusters.

Place, publisher, year, edition, pages
Stockholm: Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi, 2008. 90 p.
Keyword
germanate, crystallography, building unit, zeotype, scale chemistry
National Category
Chemical Sciences
Research subject
Structural Chemistry
Identifiers
urn:nbn:se:su:diva-7501 (URN)978-91-7155-570-0 (ISBN)
Public defence
2008-05-16, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 12 A, Stockholm, 10:00
Opponent
Supervisors
Available from: 2008-04-24 Created: 2008-04-24Bibliographically approved

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