Ce(YS2)3 crystallizes in the monoclinic P2_1/m space group. Ce(1) is bonded in a 8-coordinate geometry to one S(2), two equivalent S(5), two equivalent S(6), and three equivalent S(4) atoms. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded to one S(2), one S(5), two equivalent S(4), and three equivalent S(3) atoms to form distorted YS7 pentagonal bipyramids that share  a cornercorner with one Y(3)S6 octahedra, corners with two equivalent Y(2)S6 octahedra, edges with two equivalent Y(3)S6 octahedra, and edges with four equivalent Y(1)S7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 39-51°. In the second Y site, Y(2) is bonded to one S(1), two equivalent S(2), and three equivalent S(6) atoms to form YS6 octahedra that share corners with three equivalent Y(3)S6 octahedra, corners with two equivalent Y(1)S7 pentagonal bipyramids, and edges with four equivalent Y(2)S6 octahedra. The corner-sharing octahedral tilt angles range from 55-62°. In the third Y site, Y(3) is bonded to one S(3), two equivalent S(5), and three equivalent S(1) atoms to form YS6 octahedra that share corners with three equivalent Y(2)S6 octahedra,  a cornercorner with one Y(1)S7 pentagonal bipyramid, edges with four equivalent Y(3)S6 octahedra, and edges with two equivalent Y(1)S7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 55-62°. There are six inequivalent S sites. In the first S site, S(1) is bonded in a rectangular see-saw-like geometry to one Y(2) and three equivalent Y(3) atoms. In the second S site, S(2) is bonded to one Ce(1), one Y(1), and two equivalent Y(2) atoms to form distorted SCeY3 trigonal pyramids that share corners with two equivalent S(6)Ce2Y3 square pyramids,  a cornercorner with one S(4)Ce3Y2 trigonal bipyramid, corners with three equivalent S(5)Ce2Y3 trigonal bipyramids, corners with two equivalent S(2)CeY3 trigonal pyramids, corners with three equivalent S(3)Y4 trigonal pyramids, edges with three equivalent S(6)Ce2Y3 square pyramids, and edges with two equivalent S(4)Ce3Y2 trigonal bipyramids. In the third S site, S(3) is bonded to one Y(3) and three equivalent Y(1) atoms to form distorted SY4 trigonal pyramids that share  a cornercorner with one S(5)Ce2Y3 trigonal bipyramid, corners with four equivalent S(4)Ce3Y2 trigonal bipyramids, corners with two equivalent S(3)Y4 trigonal pyramids, corners with three equivalent S(2)CeY3 trigonal pyramids,  an edgeedge with one S(4)Ce3Y2 trigonal bipyramid, edges with two equivalent S(5)Ce2Y3 trigonal bipyramids, and edges with two equivalent S(3)Y4 trigonal pyramids. In the fourth S site, S(4) is bonded to three equivalent Ce(1) and two equivalent Y(1) atoms to form distorted SCe3Y2 trigonal bipyramids that share corners with four equivalent S(6)Ce2Y3 square pyramids, corners with two equivalent S(5)Ce2Y3 trigonal bipyramids,  a cornercorner with one S(2)CeY3 trigonal pyramid, corners with four equivalent S(3)Y4 trigonal pyramids,  an edgeedge with one S(6)Ce2Y3 square pyramid, edges with three equivalent S(5)Ce2Y3 trigonal bipyramids, edges with four equivalent S(4)Ce3Y2 trigonal bipyramids,  an edgeedge with one S(3)Y4 trigonal pyramid, and edges with two equivalent S(2)CeY3 trigonal pyramids. In the fifth S site, S(5) is bonded to two equivalent Ce(1), one Y(1), and two equivalent Y(3) atoms to form SCe2Y3 trigonal bipyramids that share corners with two equivalent S(6)Ce2Y3 square pyramids, corners with two equivalent S(4)Ce3Y2 trigonal bipyramids,  a cornercorner with one S(3)Y4 trigonal pyramid, corners with three equivalent S(2)CeY3 trigonal pyramids,  an edgeedge with one S(6)Ce2Y3 square pyramid, edges with two equivalent S(5)Ce2Y3 trigonal bipyramids, edges with three equivalent S(4)Ce3Y2 trigonal bipyramids, and edges with two equivalent S(3)Y4 trigonal pyramids. In the sixth S site, S(6) is bonded to two equivalent Ce(1) and three equivalent Y(2) atoms to form SCe2Y3 square pyramids that share corners with two equivalent S(5)Ce2Y3 trigonal bipyramids, corners with four equivalent S(4)Ce3Y2 trigonal bipyramids, corners with two equivalent S(2)CeY3 trigonal pyramids, edges with four equivalent S(6)Ce2Y3 square pyramids,  an edgeedge with one S(5)Ce2Y3 trigonal bipyramid,  an edgeedge with one S(4)Ce3Y2 trigonal bipyramid, and edges with three equivalent S(2)CeY3 trigonal pyramids.
Ce(YS2)3 crystallizes in the monoclinic P2_1/m space group. Ce(1) is bonded in a 8-coordinate geometry to one S(2), two equivalent S(5), two equivalent S(6), and three equivalent S(4) atoms. The Ce(1)-S(2) bond length is 2.97 Å. Both Ce(1)-S(5) bond lengths are 3.04 Å. Both Ce(1)-S(6) bond lengths are 3.07 Å. There are two shorter (2.92 Å) and one longer (2.94 Å) Ce(1)-S(4) bond length. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded to one S(2), one S(5), two equivalent S(4), and three equivalent S(3) atoms to form distorted YS7 pentagonal bipyramids that share  a cornercorner with one Y(3)S6 octahedra, corners with two equivalent Y(2)S6 octahedra, edges with two equivalent Y(3)S6 octahedra, and edges with four equivalent Y(1)S7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 39-51°. The Y(1)-S(2) bond length is 2.73 Å. The Y(1)-S(5) bond length is 2.86 Å. Both Y(1)-S(4) bond lengths are 2.93 Å. There are two shorter (2.70 Å) and one longer (2.90 Å) Y(1)-S(3) bond length. In the second Y site, Y(2) is bonded to one S(1), two equivalent S(2), and three equivalent S(6) atoms to form YS6 octahedra that share corners with three equivalent Y(3)S6 octahedra, corners with two equivalent Y(1)S7 pentagonal bipyramids, and edges with four equivalent Y(2)S6 octahedra. The corner-sharing octahedral tilt angles range from 55-62°. The Y(2)-S(1) bond length is 2.71 Å. Both Y(2)-S(2) bond lengths are 2.67 Å. There is one shorter (2.72 Å) and two longer (2.79 Å) Y(2)-S(6) bond lengths. In the third Y site, Y(3) is bonded to one S(3), two equivalent S(5), and three equivalent S(1) atoms to form YS6 octahedra that share corners with three equivalent Y(2)S6 octahedra,  a cornercorner with one Y(1)S7 pentagonal bipyramid, edges with four equivalent Y(3)S6 octahedra, and edges with two equivalent Y(1)S7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 55-62°. The Y(3)-S(3) bond length is 2.67 Å. Both Y(3)-S(5) bond lengths are 2.78 Å. There are two shorter (2.72 Å) and one longer (2.77 Å) Y(3)-S(1) bond length. There are six inequivalent S sites. In the first S site, S(1) is bonded in a rectangular see-saw-like geometry to one Y(2) and three equivalent Y(3) atoms. In the second S site, S(2) is bonded to one Ce(1), one Y(1), and two equivalent Y(2) atoms to form distorted SCeY3 trigonal pyramids that share corners with two equivalent S(6)Ce2Y3 square pyramids,  a cornercorner with one S(4)Ce3Y2 trigonal bipyramid, corners with three equivalent S(5)Ce2Y3 trigonal bipyramids, corners with two equivalent S(2)CeY3 trigonal pyramids, corners with three equivalent S(3)Y4 trigonal pyramids, edges with three equivalent S(6)Ce2Y3 square pyramids, and edges with two equivalent S(4)Ce3Y2 trigonal bipyramids. In the third S site, S(3) is bonded to one Y(3) and three equivalent Y(1) atoms to form distorted SY4 trigonal pyramids that share  a cornercorner with one S(5)Ce2Y3 trigonal bipyramid, corners with four equivalent S(4)Ce3Y2 trigonal bipyramids, corners with two equivalent S(3)Y4 trigonal pyramids, corners with three equivalent S(2)CeY3 trigonal pyramids,  an edgeedge with one S(4)Ce3Y2 trigonal bipyramid, edges with two equivalent S(5)Ce2Y3 trigonal bipyramids, and edges with two equivalent S(3)Y4 trigonal pyramids. In the fourth S site, S(4) is bonded to three equivalent Ce(1) and two equivalent Y(1) atoms to form distorted SCe3Y2 trigonal bipyramids that share corners with four equivalent S(6)Ce2Y3 square pyramids, corners with two equivalent S(5)Ce2Y3 trigonal bipyramids,  a cornercorner with one S(2)CeY3 trigonal pyramid, corners with four equivalent S(3)Y4 trigonal pyramids,  an edgeedge with one S(6)Ce2Y3 square pyramid, edges with three equivalent S(5)Ce2Y3 trigonal bipyramids, edges with four equivalent S(4)Ce3Y2 trigonal bipyramids,  an edgeedge with one S(3)Y4 trigonal pyramid, and edges with two equivalent S(2)CeY3 trigonal pyramids. In the fifth S site, S(5) is bonded to two equivalent Ce(1), one Y(1), and two equivalent Y(3) atoms to form SCe2Y3 trigonal bipyramids that share corners with two equivalent S(6)Ce2Y3 square pyramids, corners with two equivalent S(4)Ce3Y2 trigonal bipyramids,  a cornercorner with one S(3)Y4 trigonal pyramid, corners with three equivalent S(2)CeY3 trigonal pyramids,  an edgeedge with one S(6)Ce2Y3 square pyramid, edges with two equivalent S(5)Ce2Y3 trigonal bipyramids, edges with three equivalent S(4)Ce3Y2 trigonal bipyramids, and edges with two equivalent S(3)Y4 trigonal pyramids. In the sixth S site, S(6) is bonded to two equivalent Ce(1) and three equivalent Y(2) atoms to form SCe2Y3 square pyramids that share corners with two equivalent S(5)Ce2Y3 trigonal bipyramids, corners with four equivalent S(4)Ce3Y2 trigonal bipyramids, corners with two equivalent S(2)CeY3 trigonal pyramids, edges with four equivalent S(6)Ce2Y3 square pyramids,  an edgeedge with one S(5)Ce2Y3 trigonal bipyramid,  an edgeedge with one S(4)Ce3Y2 trigonal bipyramid, and edges with three equivalent S(2)CeY3 trigonal pyramids.