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Zeitschrift für Kristallographie - Crystalline Materials

Ed. by Antipov, Evgeny / Bismayer, Ulrich / Huppertz, Hubert / Petrícek, Václav / Pöttgen, Rainer / Schmahl, Wolfgang / Tiekink, E. R. T. / Zou, Xiaodong

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Preparation and crystal structure of bismuth trisodium trimetaphosphate nonahydrate: BiNa3(P3O9)2 · 9H2O

M. Bagieu-Beucher / A. Durif

Citation Information: Zeitschrift für Kristallographie. Volume 178, Issue 1-4, Pages 239–247, ISSN (Online) 0044-2968, ISSN (Print) 1433-7266, DOI: 10.1524/zkri.1987.178.1-4.239, August 2010

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Chemical preparation and crystal structure are given for a bismuth-sodium trimetaphosphate BiNa3(P3O9)2 · 9H2O. This double cyclophosphate is trigonal, R[unk]c, with: a = b = 30.845(15), c = 13.085(3) Å, Z = 18, V = 10781(13) Å3 and Dx = 2.534 g cm−3. The crystal structure has been solved by Patterson methods and refined to R = 0.028 for 2191 hkl. It consists of P3O9 rings lying in (001) planes interconnected by BiO8 dodecahedra along the [unk] axis and cross-linked by helicoïdal chains of NaO6 and NaO7 polyhedra.

Water molecules take part into the coordination polyhedron of each associated cation. Their arrangement makes the structure quite unstable.

A series of rare earth-sodium trimetaphosphates TNa3(P3O9)2, 9H2O has been synthetized with T = Sm, Eu, Gd, Tb, Dy, Ho, Er and Y. X-ray analysis has shown these compounds to be isotypic with the title compound.

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