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Acta Cryst. (2008). E64, i82-i83 [ doi:10.1107/S1600536808037884 ]
Abstract: The overall hexagonal framework of the title compound, pentasodium ammonium trimanganese(II) borophosphate sesquihydrate, consists of tube-like borophosphate anions, ![[infinity]](/logos/entities/infin_rmgif.gif)
1{[B3P2O11(OH)]4-}, made up of corner-sharing PO4 and BO4 tetrahedra and BO2(OH) triangles, forming ten-membered ring windows. The tubes are interconnected via distorted MnO6 octahedra, establishing a three-dimensional open-framework structure with two different types of ring-channels (12- and six-membered) that run along [001]. The 12-membered ring channels are occupied by NH4+ ions and water molecules. The ten-membered ring windows in the walls of the tubes are occupied by Na+ ions. The remaining Na+ ions and the water molecules, one of which is half-occupied, reside within the six-membered ring channels. The structural setup is consolidated by an O-H
O hydrogen bond between the OH group and an opposite O atom of the framework. Donor-acceptor distances ranging from 2.80 to 3.35 Å between the ammonium N atom, water O atoms and framework O atoms indicate further hydrogen-bonding interactions.
Online 22 November 2008
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