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The Synthesis and Characterization of a Novel Gallium Diphosphonate

Published online by Cambridge University Press:  18 March 2011

Martin P. Attfield  and
Howard G. Harvey
Martin P. Attfield
Affiliation:
School of Crystallography, Birkbeck College, Malet Street, Bloomsbury, London, WC1E 7HX, UK
Howard G. Harvey
Affiliation:
Davy-Faraday Research Laboratory, The Royal Institution of Great Britain, 21 Albemarle Street, London, W1S 4BS, UK
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Abstract

The gallium diphosphonate, Ga2[O3PC2H4PO3](H2O)2F2·H2O, has been prepared under solvothermal conditions from a HF/ pyridine solvent system. The structure of the material was determined by Rietveld refinement using the isostructural aluminium compound as the starting model for refinement. The structure consists of chains of corner sharing GaO4F2 octahedra with bridging F atoms linking the octahedra. The chains of octahedra are linked together in two directions perpendicular to the chain direction by the ethylenediphosphonate groups. The resulting structure contains a one-dimensional channel system in which extra-framework water molecules reside. Thermal gravimetric analysis of the material shows that 40 % of the extra- framework water can be reversibly absorbed. Thermodiffraction studies show that the material retains its structural integrity until all the extra-framework water is lost and then undergoes a considerable loss in crystallinity as the framework water molecules are lost. The crystallinity of the material then progressively decreases as the temperature is increased.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 658: Symposium GG – Solid-State Chemistry of Inorganic Materials III , 2000 , GG6.31
Copyright
Copyright © Materials Research Society 2001

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