Na4Ni5[(As1−xPx)O4]2[(As2yP2−2y)O7]2(x = 0.27 and y = 0.295)

Crystals of the title compound, tetrasodium pentanickel arsenic–phosphorus (2.64/3.36) docosaoxide, has been grown by a solid-state reaction and characterized by single-crystal X-ray diffraction. The structure is built up from corner- and edge-sharing (AsP)O4 tetrahedra, (AsP)2O7 groups, NiO6 octahedra and Ni2O9 units, giving rise to a polyhedral connectivity having tunnels running along the [001] direction. It is isostructural with Na4Ni5(PO4)2(P2O7)2.