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Metalophosphates with Mixed-polyhedral Framework Structures: Syntheses and Characterization by Anna Bieniok; Uwe Brendel; Werner Lottermoser; Georg Amthauer is a Chemistry article available to read on EtoBox.

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## Abstract Three new microporous compounds with octahedral-pentahedral-tetrahedral framework structures (so called OPT materials) with metalophosphate composition were prepared under solvothermal conditions and characterized by X-ray diffraction and Mössbauer spectroscopy. Ironalumino- and irongallophosphates are violet and brown-violet crystals with NH~4~[Fe~1.15~Al~1.85~P~3~O~12~](H~2~O)~2~ and NH~4~[Fe~1.05~Ga~1.95~P~3~O~12~] (H~2~O)~2~ composition. Nickelgallophosphate NH~4~[Ni~1.0~Ga~2.0~P~3~O~12~](H~2~O)~2~ forms light yellow lozenges. All products have isotype crystal structures in space group __C__2/__c__. The framework structures are built of corner- and edge-sharing distorted octahedra, trigonal bipyramids and phosphate tetrahedra. Iron occurs in two different valence states and occupies different polyhedra types in the structures, confirmed by Mössbauer spectroscopy. The compounds have three-dimensional channel systems which are filled by ammonium groups and water molecules, forming a strong hydrogen bonding system. Upon heating, the frameworks collapse during deammonization at temperatures below 573 K. A deformation analysis of the different coordination polyhedra in c

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Author

Anna Bieniok; Uwe Brendel; Werner Lottermoser; Georg Amthauer

Publisher

Walter de Gruyter GmbH

Published

2008

Language

EN

Field

Chemistry (Physical Sciences)