Yb11(U2S11)2 crystallizes in the monoclinic C2/m space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 8-coordinate geometry to one S(11), one S(7), two equivalent S(3), two equivalent S(6), and two equivalent S(8) atoms. In the second U site, U(2) is bonded in a 7-coordinate geometry to one S(4), one S(7), two equivalent S(3), and three equivalent S(1) atoms. There are six inequivalent Yb sites. In the first Yb site, Yb(1) is bonded to one S(2), one S(6), two equivalent S(11), and two equivalent S(5) atoms to form a mixture of distorted edge and corner-sharing YbS6 octahedra. The corner-sharing octahedral tilt angles range from 48-62°. In the second Yb site, Yb(2) is bonded to one S(1), two equivalent S(4), and three equivalent S(10) atoms to form a mixture of edge and corner-sharing YbS6 octahedra. The corner-sharing octahedral tilt angles range from 55-58°. In the third Yb site, Yb(3) is bonded in a 8-coordinate geometry to one S(2), one S(3), two equivalent S(11), two equivalent S(4), and two equivalent S(9) atoms. In the fourth Yb site, Yb(4) is bonded to one S(5), one S(9), two equivalent S(2), and two equivalent S(8) atoms to form a mixture of edge and corner-sharing YbS6 octahedra. The corner-sharing octahedral tilt angles range from 48-62°. In the fifth Yb site, Yb(5) is bonded to one S(10), one S(8), two equivalent S(7), and two equivalent S(9) atoms to form a mixture of edge and corner-sharing YbS6 octahedra. The corner-sharing octahedral tilt angles range from 55-58°. In the sixth Yb site, Yb(6) is bonded to two equivalent S(5) and four equivalent S(6) atoms to form a mixture of edge and corner-sharing YbS6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are eleven inequivalent S sites. In the first S site, S(1) is bonded to three equivalent U(2) and one Yb(2) atom to form distorted SYbU3 tetrahedra that share corners with four equivalent S(3)YbU4 square pyramids, corners with two equivalent S(1)YbU3 tetrahedra,  a cornercorner with one S(4)Yb4U trigonal bipyramid,  an edgeedge with one S(3)YbU4 square pyramid, edges with two equivalent S(1)YbU3 tetrahedra, and edges with two equivalent S(4)Yb4U trigonal bipyramids. In the second S site, S(2) is bonded to one Yb(1), one Yb(3), and two equivalent Yb(4) atoms to form distorted SYb4 trigonal pyramids that share  a cornercorner with one S(3)YbU4 square pyramid,  a cornercorner with one S(6)Yb3U2 trigonal bipyramid, corners with two equivalent S(8)Yb3U2 trigonal bipyramids, corners with two equivalent S(4)Yb4U trigonal bipyramids, corners with two equivalent S(2)Yb4 trigonal pyramids,  an edgeedge with one S(8)Yb3U2 trigonal bipyramid, edges with two equivalent S(11)Yb4U trigonal bipyramids, and edges with two equivalent S(9)Yb5 trigonal bipyramids. In the third S site, S(3) is bonded to two equivalent U(1), two equivalent U(2), and one Yb(3) atom to form distorted SYbU4 square pyramids that share corners with four equivalent S(1)YbU3 tetrahedra, corners with two equivalent S(6)Yb3U2 trigonal bipyramids, corners with two equivalent S(8)Yb3U2 trigonal bipyramids, corners with two equivalent S(9)Yb5 trigonal bipyramids,  a cornercorner with one S(2)Yb4 trigonal pyramid, edges with two equivalent S(3)YbU4 square pyramids,  an edgeedge with one S(1)YbU3 tetrahedra,  an edgeedge with one S(6)Yb3U2 trigonal bipyramid,  an edgeedge with one S(8)Yb3U2 trigonal bipyramid, edges with two equivalent S(11)Yb4U trigonal bipyramids, and edges with two equivalent S(4)Yb4U trigonal bipyramids. In the fourth S site, S(4) is bonded to one U(2), two equivalent Yb(2), and two equivalent Yb(3) atoms to form distorted SYb4U trigonal bipyramids that share  a cornercorner with one S(1)YbU3 tetrahedra, corners with two equivalent S(11)Yb4U trigonal bipyramids, corners with two equivalent S(9)Yb5 trigonal bipyramids, corners with two equivalent S(2)Yb4 trigonal pyramids, edges with two equivalent S(3)YbU4 square pyramids, edges with two equivalent S(1)YbU3 tetrahedra,  an edgeedge with one S(11)Yb4U trigonal bipyramid,  an edgeedge with one S(9)Yb5 trigonal bipyramid, and edges with two equivalent S(4)Yb4U trigonal bipyramids. In the fifth S site, S(5) is bonded in a rectangular see-saw-like geometry to one Yb(4), one Yb(6), and two equivalent Yb(1) atoms. In the sixth S site, S(6) is bonded to two equivalent U(1), one Yb(1), and two equivalent Yb(6) atoms to form SYb3U2 trigonal bipyramids that share corners with two equivalent S(3)YbU4 square pyramids, corners with two equivalent S(6)Yb3U2 trigonal bipyramids, corners with two equivalent S(8)Yb3U2 trigonal bipyramids,  a cornercorner with one S(2)Yb4 trigonal pyramid,  an edgeedge with one S(3)YbU4 square pyramid,  an edgeedge with one S(8)Yb3U2 trigonal bipyramid, edges with two equivalent S(11)Yb4U trigonal bipyramids, and edges with three equivalent S(6)Yb3U2 trigonal bipyramids. In the seventh S site, S(7) is bonded in a rectangular see-saw-like geometry to one U(1), one U(2), and two equivalent Yb(5) atoms. In the eighth S site, S(8) is bonded to two equivalent U(1), one Yb(5), and two equivalent Yb(4) atoms to form distorted SYb3U2 trigonal bipyramids that share corners with two equivalent S(3)YbU4 square pyramids, corners with two equivalent S(6)Yb3U2 trigonal bipyramids, corners with two equivalent S(11)Yb4U trigonal bipyramids, corners with two equivalent S(2)Yb4 trigonal pyramids,  an edgeedge with one S(3)YbU4 square pyramid,  an edgeedge with one S(6)Yb3U2 trigonal bipyramid, edges with two equivalent S(8)Yb3U2 trigonal bipyramids, edges with two equivalent S(9)Yb5 trigonal bipyramids, and  an edgeedge with one S(2)Yb4 trigonal pyramid. In the ninth S site, S(9) is bonded to one Yb(4), two equivalent Yb(3), and two equivalent Yb(5) atoms to form SYb5 trigonal bipyramids that share corners with two equivalent S(3)YbU4 square pyramids, corners with two equivalent S(11)Yb4U trigonal bipyramids, corners with two equivalent S(4)Yb4U trigonal bipyramids,  an edgeedge with one S(11)Yb4U trigonal bipyramid,  an edgeedge with one S(4)Yb4U trigonal bipyramid, edges with two equivalent S(8)Yb3U2 trigonal bipyramids, edges with two equivalent S(9)Yb5 trigonal bipyramids, and edges with two equivalent S(2)Yb4 trigonal pyramids. In the tenth S site, S(10) is bonded in a rectangular see-saw-like geometry to one Yb(5) and three equivalent Yb(2) atoms. In the eleventh S site, S(11) is bonded to one U(1), two equivalent Yb(1), and two equivalent Yb(3) atoms to form distorted SYb4U trigonal bipyramids that share corners with two equivalent S(8)Yb3U2 trigonal bipyramids, corners with two equivalent S(4)Yb4U trigonal bipyramids, corners with two equivalent S(9)Yb5 trigonal bipyramids, edges with two equivalent S(3)YbU4 square pyramids,  an edgeedge with one S(4)Yb4U trigonal bipyramid,  an edgeedge with one S(9)Yb5 trigonal bipyramid, edges with two equivalent S(6)Yb3U2 trigonal bipyramids, edges with two equivalent S(11)Yb4U trigonal bipyramids, and edges with two equivalent S(2)Yb4 trigonal pyramids.
Yb11(U2S11)2 crystallizes in the monoclinic C2/m space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 8-coordinate geometry to one S(11), one S(7), two equivalent S(3), two equivalent S(6), and two equivalent S(8) atoms. The U(1)-S(11) bond length is 2.67 Å. The U(1)-S(7) bond length is 2.97 Å. Both U(1)-S(3) bond lengths are 2.90 Å. Both U(1)-S(6) bond lengths are 2.79 Å. Both U(1)-S(8) bond lengths are 2.81 Å. In the second U site, U(2) is bonded in a 7-coordinate geometry to one S(4), one S(7), two equivalent S(3), and three equivalent S(1) atoms. The U(2)-S(4) bond length is 2.58 Å. The U(2)-S(7) bond length is 2.57 Å. Both U(2)-S(3) bond lengths are 2.79 Å. There are two shorter (2.69 Å) and one longer (2.97 Å) U(2)-S(1) bond length. There are six inequivalent Yb sites. In the first Yb site, Yb(1) is bonded to one S(2), one S(6), two equivalent S(11), and two equivalent S(5) atoms to form a mixture of distorted edge and corner-sharing YbS6 octahedra. The corner-sharing octahedral tilt angles range from 48-62°. The Yb(1)-S(2) bond length is 2.68 Å. The Yb(1)-S(6) bond length is 2.81 Å. Both Yb(1)-S(11) bond lengths are 2.97 Å. Both Yb(1)-S(5) bond lengths are 2.71 Å. In the second Yb site, Yb(2) is bonded to one S(1), two equivalent S(4), and three equivalent S(10) atoms to form a mixture of edge and corner-sharing YbS6 octahedra. The corner-sharing octahedral tilt angles range from 55-58°. The Yb(2)-S(1) bond length is 2.93 Å. Both Yb(2)-S(4) bond lengths are 2.90 Å. There are two shorter (2.68 Å) and one longer (2.71 Å) Yb(2)-S(10) bond length. In the third Yb site, Yb(3) is bonded in a 8-coordinate geometry to one S(2), one S(3), two equivalent S(11), two equivalent S(4), and two equivalent S(9) atoms. The Yb(3)-S(2) bond length is 3.26 Å. The Yb(3)-S(3) bond length is 3.18 Å. Both Yb(3)-S(11) bond lengths are 2.91 Å. Both Yb(3)-S(4) bond lengths are 3.04 Å. Both Yb(3)-S(9) bond lengths are 2.87 Å. In the fourth Yb site, Yb(4) is bonded to one S(5), one S(9), two equivalent S(2), and two equivalent S(8) atoms to form a mixture of edge and corner-sharing YbS6 octahedra. The corner-sharing octahedral tilt angles range from 48-62°. The Yb(4)-S(5) bond length is 2.69 Å. The Yb(4)-S(9) bond length is 2.82 Å. Both Yb(4)-S(2) bond lengths are 2.68 Å. Both Yb(4)-S(8) bond lengths are 3.08 Å. In the fifth Yb site, Yb(5) is bonded to one S(10), one S(8), two equivalent S(7), and two equivalent S(9) atoms to form a mixture of edge and corner-sharing YbS6 octahedra. The corner-sharing octahedral tilt angles range from 55-58°. The Yb(5)-S(10) bond length is 2.60 Å. The Yb(5)-S(8) bond length is 2.77 Å. Both Yb(5)-S(7) bond lengths are 2.92 Å. Both Yb(5)-S(9) bond lengths are 2.79 Å. In the sixth Yb site, Yb(6) is bonded to two equivalent S(5) and four equivalent S(6) atoms to form a mixture of edge and corner-sharing YbS6 octahedra. The corner-sharing octahedral tilt angles are 53°. Both Yb(6)-S(5) bond lengths are 2.66 Å. All Yb(6)-S(6) bond lengths are 2.86 Å. There are eleven inequivalent S sites. In the first S site, S(1) is bonded to three equivalent U(2) and one Yb(2) atom to form distorted SYbU3 tetrahedra that share corners with four equivalent S(3)YbU4 square pyramids, corners with two equivalent S(1)YbU3 tetrahedra,  a cornercorner with one S(4)Yb4U trigonal bipyramid,  an edgeedge with one S(3)YbU4 square pyramid, edges with two equivalent S(1)YbU3 tetrahedra, and edges with two equivalent S(4)Yb4U trigonal bipyramids. In the second S site, S(2) is bonded to one Yb(1), one Yb(3), and two equivalent Yb(4) atoms to form distorted SYb4 trigonal pyramids that share  a cornercorner with one S(3)YbU4 square pyramid,  a cornercorner with one S(6)Yb3U2 trigonal bipyramid, corners with two equivalent S(8)Yb3U2 trigonal bipyramids, corners with two equivalent S(4)Yb4U trigonal bipyramids, corners with two equivalent S(2)Yb4 trigonal pyramids,  an edgeedge with one S(8)Yb3U2 trigonal bipyramid, edges with two equivalent S(11)Yb4U trigonal bipyramids, and edges with two equivalent S(9)Yb5 trigonal bipyramids. In the third S site, S(3) is bonded to two equivalent U(1), two equivalent U(2), and one Yb(3) atom to form distorted SYbU4 square pyramids that share corners with four equivalent S(1)YbU3 tetrahedra, corners with two equivalent S(6)Yb3U2 trigonal bipyramids, corners with two equivalent S(8)Yb3U2 trigonal bipyramids, corners with two equivalent S(9)Yb5 trigonal bipyramids,  a cornercorner with one S(2)Yb4 trigonal pyramid, edges with two equivalent S(3)YbU4 square pyramids,  an edgeedge with one S(1)YbU3 tetrahedra,  an edgeedge with one S(6)Yb3U2 trigonal bipyramid,  an edgeedge with one S(8)Yb3U2 trigonal bipyramid, edges with two equivalent S(11)Yb4U trigonal bipyramids, and edges with two equivalent S(4)Yb4U trigonal bipyramids. In the fourth S site, S(4) is bonded to one U(2), two equivalent Yb(2), and two equivalent Yb(3) atoms to form distorted SYb4U trigonal bipyramids that share  a cornercorner with one S(1)YbU3 tetrahedra, corners with two equivalent S(11)Yb4U trigonal bipyramids, corners with two equivalent S(9)Yb5 trigonal bipyramids, corners with two equivalent S(2)Yb4 trigonal pyramids, edges with two equivalent S(3)YbU4 square pyramids, edges with two equivalent S(1)YbU3 tetrahedra,  an edgeedge with one S(11)Yb4U trigonal bipyramid,  an edgeedge with one S(9)Yb5 trigonal bipyramid, and edges with two equivalent S(4)Yb4U trigonal bipyramids. In the fifth S site, S(5) is bonded in a rectangular see-saw-like geometry to one Yb(4), one Yb(6), and two equivalent Yb(1) atoms. In the sixth S site, S(6) is bonded to two equivalent U(1), one Yb(1), and two equivalent Yb(6) atoms to form SYb3U2 trigonal bipyramids that share corners with two equivalent S(3)YbU4 square pyramids, corners with two equivalent S(6)Yb3U2 trigonal bipyramids, corners with two equivalent S(8)Yb3U2 trigonal bipyramids,  a cornercorner with one S(2)Yb4 trigonal pyramid,  an edgeedge with one S(3)YbU4 square pyramid,  an edgeedge with one S(8)Yb3U2 trigonal bipyramid, edges with two equivalent S(11)Yb4U trigonal bipyramids, and edges with three equivalent S(6)Yb3U2 trigonal bipyramids. In the seventh S site, S(7) is bonded in a rectangular see-saw-like geometry to one U(1), one U(2), and two equivalent Yb(5) atoms. In the eighth S site, S(8) is bonded to two equivalent U(1), one Yb(5), and two equivalent Yb(4) atoms to form distorted SYb3U2 trigonal bipyramids that share corners with two equivalent S(3)YbU4 square pyramids, corners with two equivalent S(6)Yb3U2 trigonal bipyramids, corners with two equivalent S(11)Yb4U trigonal bipyramids, corners with two equivalent S(2)Yb4 trigonal pyramids,  an edgeedge with one S(3)YbU4 square pyramid,  an edgeedge with one S(6)Yb3U2 trigonal bipyramid, edges with two equivalent S(8)Yb3U2 trigonal bipyramids, edges with two equivalent S(9)Yb5 trigonal bipyramids, and  an edgeedge with one S(2)Yb4 trigonal pyramid. In the ninth S site, S(9) is bonded to one Yb(4), two equivalent Yb(3), and two equivalent Yb(5) atoms to form SYb5 trigonal bipyramids that share corners with two equivalent S(3)YbU4 square pyramids, corners with two equivalent S(11)Yb4U trigonal bipyramids, corners with two equivalent S(4)Yb4U trigonal bipyramids,  an edgeedge with one S(11)Yb4U trigonal bipyramid,  an edgeedge with one S(4)Yb4U trigonal bipyramid, edges with two equivalent S(8)Yb3U2 trigonal bipyramids, edges with two equivalent S(9)Yb5 trigonal bipyramids, and edges with two equivalent S(2)Yb4 trigonal pyramids. In the tenth S site, S(10) is bonded in a rectangular see-saw-like geometry to one Yb(5) and three equivalent Yb(2) atoms. In the eleventh S site, S(11) is bonded to one U(1), two equivalent Yb(1), and two equivalent Yb(3) atoms to form distorted SYb4U trigonal bipyramids that share corners with two equivalent S(8)Yb3U2 trigonal bipyramids, corners with two equivalent S(4)Yb4U trigonal bipyramids, corners with two equivalent S(9)Yb5 trigonal bipyramids, edges with two equivalent S(3)YbU4 square pyramids,  an edgeedge with one S(4)Yb4U trigonal bipyramid,  an edgeedge with one S(9)Yb5 trigonal bipyramid, edges with two equivalent S(6)Yb3U2 trigonal bipyramids, edges with two equivalent S(11)Yb4U trigonal bipyramids, and edges with two equivalent S(2)Yb4 trigonal pyramids.