In the title compound, the NiII
cations have a pseudo-face-centered cubic cell, with cell parameter a
10.216 Å and tetrahedral cavities occupied by P atoms. The NiII
cation has an octahedral coordination sphere consisting of six water O atoms. The planes of oppositely coordinated water molecules are in a cross conformation. The geometry of the hypophosphite anion is close to point symmetry mm
2. The hypophosphite anions are hydrogen bonded to the coordinated water molecules.