La4(YS2)11 crystallizes in the monoclinic C2/m space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one S(1), one S(9), two equivalent S(6), two equivalent S(7), and two equivalent S(8) atoms. In the second La site, La(2) is bonded in a 8-coordinate geometry to one S(4), one S(8), two equivalent S(1), two equivalent S(2), and two equivalent S(5) atoms. There are six inequivalent Y sites. In the first Y site, Y(1) is bonded to one S(2), one S(9), two equivalent S(8), and three equivalent S(11) atoms to form distorted YS7 pentagonal bipyramids that share  a cornercorner with one Y(4)S6 octahedra, corners with two equivalent Y(3)S6 octahedra, edges with two equivalent Y(4)S6 octahedra, and edges with four equivalent Y(1)S7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 40-50°. In the second Y site, Y(2) is bonded to one S(4), one S(7), two equivalent S(1), and two equivalent S(10) atoms to form a mixture of edge and corner-sharing YS6 octahedra. The corner-sharing octahedral tilt angles range from 49-59°. In the third Y site, Y(3) is bonded to one S(3), one S(6), two equivalent S(5), and two equivalent S(9) atoms to form YS6 octahedra that share corners with three equivalent Y(4)S6 octahedra, corners with two equivalent Y(1)S7 pentagonal bipyramids, edges with two equivalent Y(3)S6 octahedra, and edges with two equivalent Y(5)S6 octahedra. The corner-sharing octahedral tilt angles range from 51-63°. In the fourth Y site, Y(4) is bonded to one S(11), two equivalent S(2), and three equivalent S(3) atoms to form YS6 octahedra that share corners with three equivalent Y(3)S6 octahedra,  a cornercorner with one Y(1)S7 pentagonal bipyramid, edges with four equivalent Y(4)S6 octahedra, and edges with two equivalent Y(1)S7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 51-63°. In the fifth Y site, Y(5) is bonded to one S(10), one S(5), two equivalent S(4), and two equivalent S(6) atoms to form a mixture of edge and corner-sharing YS6 octahedra. The corner-sharing octahedral tilt angles range from 49-59°. In the sixth Y site, Y(6) is bonded to two equivalent S(10) and four equivalent S(7) atoms to form a mixture of edge and corner-sharing YS6 octahedra. The corner-sharing octahedral tilt angles are 55°. There are eleven inequivalent S sites. In the first S site, S(1) is bonded to one La(1), two equivalent La(2), and two equivalent Y(2) atoms to form distorted SLa3Y2 trigonal bipyramids that share corners with two equivalent S(5)La2Y3 square pyramids, corners with two equivalent S(6)La2Y3 square pyramids, corners with two equivalent S(2)La2Y3 trigonal bipyramids,  a cornercorner with one S(9)LaY3 trigonal pyramid,  an edgeedge with one S(5)La2Y3 square pyramid, edges with two equivalent S(7)La2Y3 square pyramids,  an edgeedge with one S(2)La2Y3 trigonal bipyramid, edges with two equivalent S(1)La3Y2 trigonal bipyramids, and edges with two equivalent S(8)La3Y2 trigonal bipyramids. In the second S site, S(2) is bonded to two equivalent La(2), one Y(1), and two equivalent Y(4) atoms to form SLa2Y3 trigonal bipyramids that share corners with two equivalent S(5)La2Y3 square pyramids, corners with two equivalent S(1)La3Y2 trigonal bipyramids,  a cornercorner with one S(9)LaY3 trigonal pyramid,  a cornercorner with one S(11)Y4 trigonal pyramid,  an edgeedge with one S(5)La2Y3 square pyramid,  an edgeedge with one S(1)La3Y2 trigonal bipyramid, edges with two equivalent S(2)La2Y3 trigonal bipyramids, edges with two equivalent S(8)La3Y2 trigonal bipyramids, and edges with two equivalent S(11)Y4 trigonal pyramids. In the third S site, S(3) is bonded in a rectangular see-saw-like geometry to one Y(3) and three equivalent Y(4) atoms. In the fourth S site, S(4) is bonded in a 3-coordinate geometry to one La(2), one Y(2), and two equivalent Y(5) atoms. In the fifth S site, S(5) is bonded to two equivalent La(2), one Y(5), and two equivalent Y(3) atoms to form SLa2Y3 square pyramids that share corners with two equivalent S(2)La2Y3 trigonal bipyramids, corners with two equivalent S(1)La3Y2 trigonal bipyramids, corners with two equivalent S(8)La3Y2 trigonal bipyramids, corners with two equivalent S(9)LaY3 trigonal pyramids, edges with two equivalent S(5)La2Y3 square pyramids, edges with two equivalent S(6)La2Y3 square pyramids,  an edgeedge with one S(2)La2Y3 trigonal bipyramid,  an edgeedge with one S(1)La3Y2 trigonal bipyramid, and  an edgeedge with one S(9)LaY3 trigonal pyramid. In the sixth S site, S(6) is bonded to two equivalent La(1), one Y(3), and two equivalent Y(5) atoms to form SLa2Y3 square pyramids that share corners with two equivalent S(7)La2Y3 square pyramids, corners with two equivalent S(1)La3Y2 trigonal bipyramids, corners with two equivalent S(8)La3Y2 trigonal bipyramids,  an edgeedge with one S(7)La2Y3 square pyramid, edges with two equivalent S(5)La2Y3 square pyramids, edges with two equivalent S(6)La2Y3 square pyramids,  an edgeedge with one S(8)La3Y2 trigonal bipyramid, and edges with two equivalent S(9)LaY3 trigonal pyramids. In the seventh S site, S(7) is bonded to two equivalent La(1), one Y(2), and two equivalent Y(6) atoms to form SLa2Y3 square pyramids that share corners with two equivalent S(6)La2Y3 square pyramids, corners with two equivalent S(7)La2Y3 square pyramids, corners with two equivalent S(8)La3Y2 trigonal bipyramids, corners with two equivalent S(9)LaY3 trigonal pyramids,  an edgeedge with one S(6)La2Y3 square pyramid, edges with three equivalent S(7)La2Y3 square pyramids,  an edgeedge with one S(8)La3Y2 trigonal bipyramid, and edges with two equivalent S(1)La3Y2 trigonal bipyramids. In the eighth S site, S(8) is bonded to one La(2), two equivalent La(1), and two equivalent Y(1) atoms to form distorted SLa3Y2 trigonal bipyramids that share corners with two equivalent S(5)La2Y3 square pyramids, corners with two equivalent S(6)La2Y3 square pyramids, corners with two equivalent S(7)La2Y3 square pyramids, corners with four equivalent S(11)Y4 trigonal pyramids,  an edgeedge with one S(6)La2Y3 square pyramid,  an edgeedge with one S(7)La2Y3 square pyramid, edges with two equivalent S(2)La2Y3 trigonal bipyramids, edges with two equivalent S(1)La3Y2 trigonal bipyramids, edges with two equivalent S(8)La3Y2 trigonal bipyramids,  an edgeedge with one S(11)Y4 trigonal pyramid, and edges with two equivalent S(9)LaY3 trigonal pyramids. In the ninth S site, S(9) is bonded to one La(1), one Y(1), and two equivalent Y(3) atoms to form SLaY3 trigonal pyramids that share corners with two equivalent S(5)La2Y3 square pyramids, corners with two equivalent S(7)La2Y3 square pyramids,  a cornercorner with one S(2)La2Y3 trigonal bipyramid,  a cornercorner with one S(1)La3Y2 trigonal bipyramid, corners with two equivalent S(9)LaY3 trigonal pyramids, corners with three equivalent S(11)Y4 trigonal pyramids,  an edgeedge with one S(5)La2Y3 square pyramid, edges with two equivalent S(6)La2Y3 square pyramids, and edges with two equivalent S(8)La3Y2 trigonal bipyramids. In the tenth S site, S(10) is bonded in a rectangular see-saw-like geometry to one Y(5), one Y(6), and two equivalent Y(2) atoms. In the eleventh S site, S(11) is bonded to one Y(4) and three equivalent Y(1) atoms to form distorted SY4 trigonal pyramids that share  a cornercorner with one S(2)La2Y3 trigonal bipyramid, corners with four equivalent S(8)La3Y2 trigonal bipyramids, corners with two equivalent S(11)Y4 trigonal pyramids, corners with three equivalent S(9)LaY3 trigonal pyramids,  an edgeedge with one S(8)La3Y2 trigonal bipyramid, edges with two equivalent S(2)La2Y3 trigonal bipyramids, and edges with two equivalent S(11)Y4 trigonal pyramids.
La4(YS2)11 crystallizes in the monoclinic C2/m space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one S(1), one S(9), two equivalent S(6), two equivalent S(7), and two equivalent S(8) atoms. The La(1)-S(1) bond length is 3.03 Å. The La(1)-S(9) bond length is 2.96 Å. Both La(1)-S(6) bond lengths are 3.08 Å. Both La(1)-S(7) bond lengths are 3.05 Å. Both La(1)-S(8) bond lengths are 2.94 Å. In the second La site, La(2) is bonded in a 8-coordinate geometry to one S(4), one S(8), two equivalent S(1), two equivalent S(2), and two equivalent S(5) atoms. The La(2)-S(4) bond length is 3.48 Å. The La(2)-S(8) bond length is 2.98 Å. Both La(2)-S(1) bond lengths are 2.93 Å. Both La(2)-S(2) bond lengths are 3.00 Å. Both La(2)-S(5) bond lengths are 3.04 Å. There are six inequivalent Y sites. In the first Y site, Y(1) is bonded to one S(2), one S(9), two equivalent S(8), and three equivalent S(11) atoms to form distorted YS7 pentagonal bipyramids that share  a cornercorner with one Y(4)S6 octahedra, corners with two equivalent Y(3)S6 octahedra, edges with two equivalent Y(4)S6 octahedra, and edges with four equivalent Y(1)S7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 40-50°. The Y(1)-S(2) bond length is 2.90 Å. The Y(1)-S(9) bond length is 2.78 Å. Both Y(1)-S(8) bond lengths are 2.90 Å. There are two shorter (2.71 Å) and one longer (2.88 Å) Y(1)-S(11) bond length. In the second Y site, Y(2) is bonded to one S(4), one S(7), two equivalent S(1), and two equivalent S(10) atoms to form a mixture of edge and corner-sharing YS6 octahedra. The corner-sharing octahedral tilt angles range from 49-59°. The Y(2)-S(4) bond length is 2.66 Å. The Y(2)-S(7) bond length is 2.76 Å. Both Y(2)-S(1) bond lengths are 2.80 Å. Both Y(2)-S(10) bond lengths are 2.72 Å. In the third Y site, Y(3) is bonded to one S(3), one S(6), two equivalent S(5), and two equivalent S(9) atoms to form YS6 octahedra that share corners with three equivalent Y(4)S6 octahedra, corners with two equivalent Y(1)S7 pentagonal bipyramids, edges with two equivalent Y(3)S6 octahedra, and edges with two equivalent Y(5)S6 octahedra. The corner-sharing octahedral tilt angles range from 51-63°. The Y(3)-S(3) bond length is 2.73 Å. The Y(3)-S(6) bond length is 2.73 Å. Both Y(3)-S(5) bond lengths are 2.82 Å. Both Y(3)-S(9) bond lengths are 2.67 Å. In the fourth Y site, Y(4) is bonded to one S(11), two equivalent S(2), and three equivalent S(3) atoms to form YS6 octahedra that share corners with three equivalent Y(3)S6 octahedra,  a cornercorner with one Y(1)S7 pentagonal bipyramid, edges with four equivalent Y(4)S6 octahedra, and edges with two equivalent Y(1)S7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 51-63°. The Y(4)-S(11) bond length is 2.68 Å. Both Y(4)-S(2) bond lengths are 2.79 Å. There are two shorter (2.73 Å) and one longer (2.78 Å) Y(4)-S(3) bond length. In the fifth Y site, Y(5) is bonded to one S(10), one S(5), two equivalent S(4), and two equivalent S(6) atoms to form a mixture of edge and corner-sharing YS6 octahedra. The corner-sharing octahedral tilt angles range from 49-59°. The Y(5)-S(10) bond length is 2.78 Å. The Y(5)-S(5) bond length is 2.76 Å. Both Y(5)-S(4) bond lengths are 2.67 Å. Both Y(5)-S(6) bond lengths are 2.79 Å. In the sixth Y site, Y(6) is bonded to two equivalent S(10) and four equivalent S(7) atoms to form a mixture of edge and corner-sharing YS6 octahedra. The corner-sharing octahedral tilt angles are 55°. Both Y(6)-S(10) bond lengths are 2.74 Å. All Y(6)-S(7) bond lengths are 2.75 Å. There are eleven inequivalent S sites. In the first S site, S(1) is bonded to one La(1), two equivalent La(2), and two equivalent Y(2) atoms to form distorted SLa3Y2 trigonal bipyramids that share corners with two equivalent S(5)La2Y3 square pyramids, corners with two equivalent S(6)La2Y3 square pyramids, corners with two equivalent S(2)La2Y3 trigonal bipyramids,  a cornercorner with one S(9)LaY3 trigonal pyramid,  an edgeedge with one S(5)La2Y3 square pyramid, edges with two equivalent S(7)La2Y3 square pyramids,  an edgeedge with one S(2)La2Y3 trigonal bipyramid, edges with two equivalent S(1)La3Y2 trigonal bipyramids, and edges with two equivalent S(8)La3Y2 trigonal bipyramids. In the second S site, S(2) is bonded to two equivalent La(2), one Y(1), and two equivalent Y(4) atoms to form SLa2Y3 trigonal bipyramids that share corners with two equivalent S(5)La2Y3 square pyramids, corners with two equivalent S(1)La3Y2 trigonal bipyramids,  a cornercorner with one S(9)LaY3 trigonal pyramid,  a cornercorner with one S(11)Y4 trigonal pyramid,  an edgeedge with one S(5)La2Y3 square pyramid,  an edgeedge with one S(1)La3Y2 trigonal bipyramid, edges with two equivalent S(2)La2Y3 trigonal bipyramids, edges with two equivalent S(8)La3Y2 trigonal bipyramids, and edges with two equivalent S(11)Y4 trigonal pyramids. In the third S site, S(3) is bonded in a rectangular see-saw-like geometry to one Y(3) and three equivalent Y(4) atoms. In the fourth S site, S(4) is bonded in a 3-coordinate geometry to one La(2), one Y(2), and two equivalent Y(5) atoms. In the fifth S site, S(5) is bonded to two equivalent La(2), one Y(5), and two equivalent Y(3) atoms to form SLa2Y3 square pyramids that share corners with two equivalent S(2)La2Y3 trigonal bipyramids, corners with two equivalent S(1)La3Y2 trigonal bipyramids, corners with two equivalent S(8)La3Y2 trigonal bipyramids, corners with two equivalent S(9)LaY3 trigonal pyramids, edges with two equivalent S(5)La2Y3 square pyramids, edges with two equivalent S(6)La2Y3 square pyramids,  an edgeedge with one S(2)La2Y3 trigonal bipyramid,  an edgeedge with one S(1)La3Y2 trigonal bipyramid, and  an edgeedge with one S(9)LaY3 trigonal pyramid. In the sixth S site, S(6) is bonded to two equivalent La(1), one Y(3), and two equivalent Y(5) atoms to form SLa2Y3 square pyramids that share corners with two equivalent S(7)La2Y3 square pyramids, corners with two equivalent S(1)La3Y2 trigonal bipyramids, corners with two equivalent S(8)La3Y2 trigonal bipyramids,  an edgeedge with one S(7)La2Y3 square pyramid, edges with two equivalent S(5)La2Y3 square pyramids, edges with two equivalent S(6)La2Y3 square pyramids,  an edgeedge with one S(8)La3Y2 trigonal bipyramid, and edges with two equivalent S(9)LaY3 trigonal pyramids. In the seventh S site, S(7) is bonded to two equivalent La(1), one Y(2), and two equivalent Y(6) atoms to form SLa2Y3 square pyramids that share corners with two equivalent S(6)La2Y3 square pyramids, corners with two equivalent S(7)La2Y3 square pyramids, corners with two equivalent S(8)La3Y2 trigonal bipyramids, corners with two equivalent S(9)LaY3 trigonal pyramids,  an edgeedge with one S(6)La2Y3 square pyramid, edges with three equivalent S(7)La2Y3 square pyramids,  an edgeedge with one S(8)La3Y2 trigonal bipyramid, and edges with two equivalent S(1)La3Y2 trigonal bipyramids. In the eighth S site, S(8) is bonded to one La(2), two equivalent La(1), and two equivalent Y(1) atoms to form distorted SLa3Y2 trigonal bipyramids that share corners with two equivalent S(5)La2Y3 square pyramids, corners with two equivalent S(6)La2Y3 square pyramids, corners with two equivalent S(7)La2Y3 square pyramids, corners with four equivalent S(11)Y4 trigonal pyramids,  an edgeedge with one S(6)La2Y3 square pyramid,  an edgeedge with one S(7)La2Y3 square pyramid, edges with two equivalent S(2)La2Y3 trigonal bipyramids, edges with two equivalent S(1)La3Y2 trigonal bipyramids, edges with two equivalent S(8)La3Y2 trigonal bipyramids,  an edgeedge with one S(11)Y4 trigonal pyramid, and edges with two equivalent S(9)LaY3 trigonal pyramids. In the ninth S site, S(9) is bonded to one La(1), one Y(1), and two equivalent Y(3) atoms to form SLaY3 trigonal pyramids that share corners with two equivalent S(5)La2Y3 square pyramids, corners with two equivalent S(7)La2Y3 square pyramids,  a cornercorner with one S(2)La2Y3 trigonal bipyramid,  a cornercorner with one S(1)La3Y2 trigonal bipyramid, corners with two equivalent S(9)LaY3 trigonal pyramids, corners with three equivalent S(11)Y4 trigonal pyramids,  an edgeedge with one S(5)La2Y3 square pyramid, edges with two equivalent S(6)La2Y3 square pyramids, and edges with two equivalent S(8)La3Y2 trigonal bipyramids. In the tenth S site, S(10) is bonded in a rectangular see-saw-like geometry to one Y(5), one Y(6), and two equivalent Y(2) atoms. In the eleventh S site, S(11) is bonded to one Y(4) and three equivalent Y(1) atoms to form distorted SY4 trigonal pyramids that share  a cornercorner with one S(2)La2Y3 trigonal bipyramid, corners with four equivalent S(8)La3Y2 trigonal bipyramids, corners with two equivalent S(11)Y4 trigonal pyramids, corners with three equivalent S(9)LaY3 trigonal pyramids,  an edgeedge with one S(8)La3Y2 trigonal bipyramid, edges with two equivalent S(2)La2Y3 trigonal bipyramids, and edges with two equivalent S(11)Y4 trigonal pyramids.