NpSc3 is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. Np(1) is bonded to four equivalent Sc(2) and eight equivalent Sc(1) atoms to form NpSc12 cuboctahedra that share corners with four equivalent Np(1)Sc12 cuboctahedra, corners with eight equivalent Sc(2)Np4Sc8 cuboctahedra, edges with eight equivalent Np(1)Sc12 cuboctahedra, edges with sixteen equivalent Sc(1)Np4Sc8 cuboctahedra, faces with four equivalent Np(1)Sc12 cuboctahedra, faces with six equivalent Sc(2)Np4Sc8 cuboctahedra, and faces with eight equivalent Sc(1)Np4Sc8 cuboctahedra. There are two inequivalent Sc sites. In the first Sc site, Sc(1) is bonded to four equivalent Np(1), four equivalent Sc(1), and four equivalent Sc(2) atoms to form ScNp4Sc8 cuboctahedra that share corners with twelve equivalent Sc(1)Np4Sc8 cuboctahedra, edges with eight equivalent Np(1)Sc12 cuboctahedra, edges with eight equivalent Sc(1)Np4Sc8 cuboctahedra, edges with eight equivalent Sc(2)Np4Sc8 cuboctahedra, faces with four equivalent Np(1)Sc12 cuboctahedra, faces with four equivalent Sc(2)Np4Sc8 cuboctahedra, and faces with ten equivalent Sc(1)Np4Sc8 cuboctahedra. In the second Sc site, Sc(2) is bonded to four equivalent Np(1) and eight equivalent Sc(1) atoms to form ScNp4Sc8 cuboctahedra that share corners with four equivalent Sc(2)Np4Sc8 cuboctahedra, corners with eight equivalent Np(1)Sc12 cuboctahedra, edges with eight equivalent Sc(2)Np4Sc8 cuboctahedra, edges with sixteen equivalent Sc(1)Np4Sc8 cuboctahedra, faces with four equivalent Sc(2)Np4Sc8 cuboctahedra, faces with six equivalent Np(1)Sc12 cuboctahedra, and faces with eight equivalent Sc(1)Np4Sc8 cuboctahedra.
NpSc3 is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. Np(1) is bonded to four equivalent Sc(2) and eight equivalent Sc(1) atoms to form NpSc12 cuboctahedra that share corners with four equivalent Np(1)Sc12 cuboctahedra, corners with eight equivalent Sc(2)Np4Sc8 cuboctahedra, edges with eight equivalent Np(1)Sc12 cuboctahedra, edges with sixteen equivalent Sc(1)Np4Sc8 cuboctahedra, faces with four equivalent Np(1)Sc12 cuboctahedra, faces with six equivalent Sc(2)Np4Sc8 cuboctahedra, and faces with eight equivalent Sc(1)Np4Sc8 cuboctahedra. All Np(1)-Sc(2) bond lengths are 3.19 Å. All Np(1)-Sc(1) bond lengths are 3.28 Å. There are two inequivalent Sc sites. In the first Sc site, Sc(1) is bonded to four equivalent Np(1), four equivalent Sc(1), and four equivalent Sc(2) atoms to form ScNp4Sc8 cuboctahedra that share corners with twelve equivalent Sc(1)Np4Sc8 cuboctahedra, edges with eight equivalent Np(1)Sc12 cuboctahedra, edges with eight equivalent Sc(1)Np4Sc8 cuboctahedra, edges with eight equivalent Sc(2)Np4Sc8 cuboctahedra, faces with four equivalent Np(1)Sc12 cuboctahedra, faces with four equivalent Sc(2)Np4Sc8 cuboctahedra, and faces with ten equivalent Sc(1)Np4Sc8 cuboctahedra. All Sc(1)-Sc(1) bond lengths are 3.19 Å. All Sc(1)-Sc(2) bond lengths are 3.28 Å. In the second Sc site, Sc(2) is bonded to four equivalent Np(1) and eight equivalent Sc(1) atoms to form ScNp4Sc8 cuboctahedra that share corners with four equivalent Sc(2)Np4Sc8 cuboctahedra, corners with eight equivalent Np(1)Sc12 cuboctahedra, edges with eight equivalent Sc(2)Np4Sc8 cuboctahedra, edges with sixteen equivalent Sc(1)Np4Sc8 cuboctahedra, faces with four equivalent Sc(2)Np4Sc8 cuboctahedra, faces with six equivalent Np(1)Sc12 cuboctahedra, and faces with eight equivalent Sc(1)Np4Sc8 cuboctahedra.