inorganic compounds
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 CoCo distance being over 6 Å.
inorganic compounds
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.