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The structure of the title compound, ammonium hexa­aqua­cobalt(II) orthophosphate, known from powder data, has been refined based on single-crystal data. The compound crystallizes in the struvite [NH4Mg(H2O)6PO4] structure type and is isotypic with the homologous nickel phase. The framework is built of NH4+, [Co(H2O)6]2+ and PO43− ions stacked in two kinds of ribbons parallel to (010). CoII atoms are well separated in the framework, with the shortest Co...Co distance being over 6 Å.

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The framework of the title compound is made up of discrete Mg(H2O)6 octa­hedra, and HPO3 and NH4 tetra­hedra, which are organized in planes parallel to (010). Strong hydrogen bonding between the building units stabilizes the structure. The hydrogenphosphate(III) tetra­hedra, the ammonium tetra­hedron and one of the two Mg atoms lie on positions with m symmetry, whereas the second Mg atom is located on a position with 2/m symmetry.
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