U8TiS17 crystallizes in the monoclinic C2/m space group. There are three inequivalent U sites. In the first U site, U(1) is bonded in a 8-coordinate geometry to one S(2), one S(3), one S(4), one S(5), one S(6), one S(7), and two equivalent S(1) atoms. In the second U site, U(2) is bonded in a 8-coordinate geometry to one S(3), one S(4), one S(5), one S(7), and four equivalent S(1) atoms. In the third U site, U(3) is bonded in a 8-coordinate geometry to one S(3), one S(5), two equivalent S(6), and four equivalent S(2) atoms. Ti(1) is bonded in an octahedral geometry to two equivalent S(4) and four equivalent S(2) atoms. There are seven inequivalent S sites. In the first S site, S(6) is bonded to two equivalent U(1) and two equivalent U(3) atoms to form SU4 trigonal pyramids that share corners with two equivalent S(7)U6 octahedra, corners with six equivalent S(2)U3Ti tetrahedra, corners with two equivalent S(4)U3Ti trigonal pyramids, edges with two equivalent S(2)U3Ti tetrahedra, and  an edgeedge with one S(6)U4 trigonal pyramid. The corner-sharing octahedral tilt angles are 37°. In the second S site, S(7) is bonded to two equivalent U(2) and four equivalent U(1) atoms to form SU6 octahedra that share corners with four equivalent S(2)U3Ti tetrahedra, corners with four equivalent S(6)U4 trigonal pyramids, and faces with two equivalent S(4)U3Ti trigonal pyramids. In the third S site, S(1) is bonded in a rectangular see-saw-like geometry to two equivalent U(1) and two equivalent U(2) atoms. In the fourth S site, S(2) is bonded to one U(1), two equivalent U(3), and one Ti(1) atom to form distorted SU3Ti tetrahedra that share  a cornercorner with one S(7)U6 octahedra, corners with five equivalent S(2)U3Ti tetrahedra,  a cornercorner with one S(4)U3Ti trigonal pyramid, corners with three equivalent S(6)U4 trigonal pyramids, edges with two equivalent S(2)U3Ti tetrahedra,  an edgeedge with one S(4)U3Ti trigonal pyramid, and  an edgeedge with one S(6)U4 trigonal pyramid. The corner-sharing octahedral tilt angles are 53°. In the fifth S site, S(3) is bonded in a rectangular see-saw-like geometry to one U(2), one U(3), and two equivalent U(1) atoms. In the sixth S site, S(4) is bonded to one U(2), two equivalent U(1), and one Ti(1) atom to form distorted SU3Ti trigonal pyramids that share corners with two equivalent S(2)U3Ti tetrahedra,  a cornercorner with one S(4)U3Ti trigonal pyramid, corners with two equivalent S(6)U4 trigonal pyramids, edges with two equivalent S(2)U3Ti tetrahedra, and  a faceface with one S(7)U6 octahedra. In the seventh S site, S(5) is bonded in a rectangular see-saw-like geometry to one U(2), one U(3), and two equivalent U(1) atoms.
U8TiS17 crystallizes in the monoclinic C2/m space group. There are three inequivalent U sites. In the first U site, U(1) is bonded in a 8-coordinate geometry to one S(2), one S(3), one S(4), one S(5), one S(6), one S(7), and two equivalent S(1) atoms. The U(1)-S(2) bond length is 2.85 Å. The U(1)-S(3) bond length is 2.87 Å. The U(1)-S(4) bond length is 2.77 Å. The U(1)-S(5) bond length is 2.86 Å. The U(1)-S(6) bond length is 2.87 Å. The U(1)-S(7) bond length is 2.95 Å. There is one shorter (2.80 Å) and one longer (2.83 Å) U(1)-S(1) bond length. In the second U site, U(2) is bonded in a 8-coordinate geometry to one S(3), one S(4), one S(5), one S(7), and four equivalent S(1) atoms. The U(2)-S(3) bond length is 2.76 Å. The U(2)-S(4) bond length is 2.81 Å. The U(2)-S(5) bond length is 2.78 Å. The U(2)-S(7) bond length is 2.86 Å. There are two shorter (2.77 Å) and two longer (2.80 Å) U(2)-S(1) bond lengths. In the third U site, U(3) is bonded in a 8-coordinate geometry to one S(3), one S(5), two equivalent S(6), and four equivalent S(2) atoms. The U(3)-S(3) bond length is 2.82 Å. The U(3)-S(5) bond length is 2.81 Å. There is one shorter (2.87 Å) and one longer (2.99 Å) U(3)-S(6) bond length. There are two shorter (2.73 Å) and two longer (2.98 Å) U(3)-S(2) bond lengths. Ti(1) is bonded in an octahedral geometry to two equivalent S(4) and four equivalent S(2) atoms. Both Ti(1)-S(4) bond lengths are 2.36 Å. All Ti(1)-S(2) bond lengths are 2.45 Å. There are seven inequivalent S sites. In the first S site, S(6) is bonded to two equivalent U(1) and two equivalent U(3) atoms to form SU4 trigonal pyramids that share corners with two equivalent S(7)U6 octahedra, corners with six equivalent S(2)U3Ti tetrahedra, corners with two equivalent S(4)U3Ti trigonal pyramids, edges with two equivalent S(2)U3Ti tetrahedra, and  an edgeedge with one S(6)U4 trigonal pyramid. The corner-sharing octahedral tilt angles are 37°. In the second S site, S(7) is bonded to two equivalent U(2) and four equivalent U(1) atoms to form SU6 octahedra that share corners with four equivalent S(2)U3Ti tetrahedra, corners with four equivalent S(6)U4 trigonal pyramids, and faces with two equivalent S(4)U3Ti trigonal pyramids. In the third S site, S(1) is bonded in a rectangular see-saw-like geometry to two equivalent U(1) and two equivalent U(2) atoms. In the fourth S site, S(2) is bonded to one U(1), two equivalent U(3), and one Ti(1) atom to form distorted SU3Ti tetrahedra that share  a cornercorner with one S(7)U6 octahedra, corners with five equivalent S(2)U3Ti tetrahedra,  a cornercorner with one S(4)U3Ti trigonal pyramid, corners with three equivalent S(6)U4 trigonal pyramids, edges with two equivalent S(2)U3Ti tetrahedra,  an edgeedge with one S(4)U3Ti trigonal pyramid, and  an edgeedge with one S(6)U4 trigonal pyramid. The corner-sharing octahedral tilt angles are 53°. In the fifth S site, S(3) is bonded in a rectangular see-saw-like geometry to one U(2), one U(3), and two equivalent U(1) atoms. In the sixth S site, S(4) is bonded to one U(2), two equivalent U(1), and one Ti(1) atom to form distorted SU3Ti trigonal pyramids that share corners with two equivalent S(2)U3Ti tetrahedra,  a cornercorner with one S(4)U3Ti trigonal pyramid, corners with two equivalent S(6)U4 trigonal pyramids, edges with two equivalent S(2)U3Ti tetrahedra, and  a faceface with one S(7)U6 octahedra. In the seventh S site, S(5) is bonded in a rectangular see-saw-like geometry to one U(2), one U(3), and two equivalent U(1) atoms.