Np5Ge4 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Np sites. In the first Np site, Np(1) is bonded in a 8-coordinate geometry to two equivalent Np(1) and six equivalent Ge(1) atoms. In the second Np site, Np(2) is bonded in a 7-coordinate geometry to two equivalent Ge(2) and five equivalent Ge(1) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(2) is bonded in a 8-coordinate geometry to six equivalent Np(2) and two equivalent Ge(2) atoms. In the second Ge site, Ge(1) is bonded in a 9-coordinate geometry to four equivalent Np(1) and five equivalent Np(2) atoms.
Np5Ge4 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Np sites. In the first Np site, Np(1) is bonded in a 8-coordinate geometry to two equivalent Np(1) and six equivalent Ge(1) atoms. Both Np(1)-Np(1) bond lengths are 2.84 Å. All Np(1)-Ge(1) bond lengths are 3.04 Å. In the second Np site, Np(2) is bonded in a 7-coordinate geometry to two equivalent Ge(2) and five equivalent Ge(1) atoms. Both Np(2)-Ge(2) bond lengths are 2.90 Å. There are a spread of Np(2)-Ge(1) bond distances ranging from 2.82-2.90 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(2) is bonded in a 8-coordinate geometry to six equivalent Np(2) and two equivalent Ge(2) atoms. Both Ge(2)-Ge(2) bond lengths are 2.84 Å. In the second Ge site, Ge(1) is bonded in a 9-coordinate geometry to four equivalent Np(1) and five equivalent Np(2) atoms.