RbNp3 is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. Rb(1) is bonded to four equivalent Np(2) and eight equivalent Np(1) atoms to form RbNp12 cuboctahedra that share corners with four equivalent Rb(1)Np12 cuboctahedra, edges with eight equivalent Rb(1)Np12 cuboctahedra, edges with sixteen equivalent Np(1)Rb4Np8 cuboctahedra, faces with four equivalent Rb(1)Np12 cuboctahedra, and faces with eight equivalent Np(1)Rb4Np8 cuboctahedra. There are two inequivalent Np sites. In the first Np site, Np(1) is bonded to four equivalent Rb(1), four equivalent Np(1), and four equivalent Np(2) atoms to form distorted NpRb4Np8 cuboctahedra that share corners with twelve equivalent Np(1)Rb4Np8 cuboctahedra, edges with eight equivalent Rb(1)Np12 cuboctahedra, edges with eight equivalent Np(1)Rb4Np8 cuboctahedra, faces with four equivalent Rb(1)Np12 cuboctahedra, and faces with ten equivalent Np(1)Rb4Np8 cuboctahedra. In the second Np site, Np(2) is bonded in a distorted square co-planar geometry to four equivalent Rb(1) and eight equivalent Np(1) atoms.
RbNp3 is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. Rb(1) is bonded to four equivalent Np(2) and eight equivalent Np(1) atoms to form RbNp12 cuboctahedra that share corners with four equivalent Rb(1)Np12 cuboctahedra, edges with eight equivalent Rb(1)Np12 cuboctahedra, edges with sixteen equivalent Np(1)Rb4Np8 cuboctahedra, faces with four equivalent Rb(1)Np12 cuboctahedra, and faces with eight equivalent Np(1)Rb4Np8 cuboctahedra. All Rb(1)-Np(2) bond lengths are 3.39 Å. All Rb(1)-Np(1) bond lengths are 3.54 Å. There are two inequivalent Np sites. In the first Np site, Np(1) is bonded to four equivalent Rb(1), four equivalent Np(1), and four equivalent Np(2) atoms to form distorted NpRb4Np8 cuboctahedra that share corners with twelve equivalent Np(1)Rb4Np8 cuboctahedra, edges with eight equivalent Rb(1)Np12 cuboctahedra, edges with eight equivalent Np(1)Rb4Np8 cuboctahedra, faces with four equivalent Rb(1)Np12 cuboctahedra, and faces with ten equivalent Np(1)Rb4Np8 cuboctahedra. All Np(1)-Np(1) bond lengths are 3.39 Å. All Np(1)-Np(2) bond lengths are 3.54 Å. In the second Np site, Np(2) is bonded in a distorted square co-planar geometry to four equivalent Rb(1) and eight equivalent Np(1) atoms.