Issue 39, 2010

One-step synthesis, characterisation and properties of core/shell silicogermanate zeotype crystals

Abstract

The core/shell composite silicogermanate zeotype material, Si-ASU-7, has been prepared in a one-step solvothermal synthesis process from a reactant mixture of GeO2 and SiO2 in a dimethylamine/H2O/HF solvent mixture. The core/shell nature of the product material has been determined using a combination of X-ray diffraction on powder and single crystal samples, and energy dispersive X-ray spectroscopy. The crystal structure of Si-ASU-7, ([Si0.221Ge0.779O2]10·(Me2NH)(H2O), tetragonal, space group P4/mnc, a = 12.3484(3) Å, c = 14.3979(5) Å, V = 2195.43(11) Å3) determined using single crystal X-ray diffraction data indicates that incorporation of silicon into the structure introduces a degree of disorder to the orientation of the double 4-ring secondary building units from which the framework is constructed. The thermal stability of the as-synthesised composite Si-ASU-7 material is enhanced compared to the pure germanate material ASU-7.

Graphical abstract: One-step synthesis, characterisation and properties of core/shell silicogermanate zeotype crystals

Supplementary files

Article information

Article type
Paper
Submitted
12 May 2010
Accepted
01 Aug 2010
First published
07 Sep 2010

J. Mater. Chem., 2010,20, 8686-8692

One-step synthesis, characterisation and properties of core/shell silicogermanate zeotype crystals

M. P. Attfield, Y. Al-Ebini and P. Hill, J. Mater. Chem., 2010, 20, 8686 DOI: 10.1039/C0JM01429J

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