Reinvestigation of NH4[Co(H2O)6]PO4 based on single-crystal data

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 A.