NpSb3 crystallizes in the hexagonal P6_3/mmc space group. Np(1) is bonded to twelve equivalent Sb(1) atoms to form a mixture of corner and face-sharing NpSb12 cuboctahedra. Sb(1) is bonded in a 4-coordinate geometry to four equivalent Np(1) atoms.
NpSb3 crystallizes in the hexagonal P6_3/mmc space group. Np(1) is bonded to twelve equivalent Sb(1) atoms to form a mixture of corner and face-sharing NpSb12 cuboctahedra. There are six shorter (3.23 Å) and six longer (3.43 Å) Np(1)-Sb(1) bond lengths. Sb(1) is bonded in a 4-coordinate geometry to four equivalent Np(1) atoms.