Novel Fluorido-Oxoanions via Lewis Acid-Base Reactions - Synthesis and Crystal 
Structure Determination of Na3B2PO5F4

Jansen, M.; Pilz, T.

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Novel Fluorido-Oxoanions via Lewis Acid-Base Reactions - Synthesis and Crystal Structure Determination of Na₃B₂PO₅F₄

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Jansen, M.
Abteilung Jansen, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Jansen, M., & Pilz, T. (2013). Novel Fluorido-Oxoanions via Lewis Acid-Base Reactions - Synthesis and Crystal Structure Determination of Na₃B₂PO₅F₄. Zeitschrift für Kristallographie, 228(9), 476-482.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C669-D

Abstract

Na3B2PO5F4 has been synthesized by an all-solid-state reaction between Na3PO4 and NaBF4 and, alternatively by solid-gas reaction between Na3PO4 and BF3. The new fluoridoboratophosphate is dimorphic. Monoclinic Na3B2PO5F4-1 (P2(1)/n, a = 6.5230(6), b = 12.174(1), c = 8.8279(8)angstrom, beta = 102.322(5) degrees) and orthorhombic Na3B2PO5F4-II (Cmcm, a = 12.175(2), b = 6.719(1), c = 9.077(1) angstrom) were obtained at 623 and 673 K, respectively. The latter is a dynamically or statically disordered polymorph of the former. Both modifications contain a cyclic six membered anion build up by three interconnected tetrahedra, i.e. one PO4 and two BF2O2 units. These complex cyclo-anions feature the same number of valence electrons as cyclo- triphosphate [P3O9](3-) and fluoridooxidoborate [B3O3F6](3-).