DyCeS3 crystallizes in the orthorhombic Pnma space group. Dy(1) is bonded to one S(2), three equivalent S(1), and three equivalent S(3) atoms to form distorted edge-sharing DyS7 pentagonal bipyramids. Ce(1) is bonded in a 8-coordinate geometry to two equivalent S(1), two equivalent S(3), and four equivalent S(2) atoms. There are three inequivalent S sites. In the first S site, S(1) is bonded to three equivalent Dy(1) and two equivalent Ce(1) atoms to form distorted SCe2Dy3 trigonal bipyramids that share corners with six equivalent S(2)Ce4Dy square pyramids, corners with seven equivalent S(3)Ce2Dy3 trigonal bipyramids,  an edgeedge with one S(2)Ce4Dy square pyramid, edges with three equivalent S(3)Ce2Dy3 trigonal bipyramids, edges with four equivalent S(1)Ce2Dy3 trigonal bipyramids, and  a faceface with one S(2)Ce4Dy square pyramid. In the second S site, S(2) is bonded to one Dy(1) and four equivalent Ce(1) atoms to form distorted SCe4Dy square pyramids that share corners with four equivalent S(2)Ce4Dy square pyramids, corners with three equivalent S(3)Ce2Dy3 trigonal bipyramids, corners with six equivalent S(1)Ce2Dy3 trigonal bipyramids, edges with four equivalent S(2)Ce4Dy square pyramids,  an edgeedge with one S(1)Ce2Dy3 trigonal bipyramid, edges with four equivalent S(3)Ce2Dy3 trigonal bipyramids, and  a faceface with one S(1)Ce2Dy3 trigonal bipyramid. In the third S site, S(3) is bonded to three equivalent Dy(1) and two equivalent Ce(1) atoms to form distorted SCe2Dy3 trigonal bipyramids that share corners with three equivalent S(2)Ce4Dy square pyramids, corners with four equivalent S(3)Ce2Dy3 trigonal bipyramids, corners with seven equivalent S(1)Ce2Dy3 trigonal bipyramids, edges with four equivalent S(2)Ce4Dy square pyramids, edges with two equivalent S(3)Ce2Dy3 trigonal bipyramids, and edges with three equivalent S(1)Ce2Dy3 trigonal bipyramids.
DyCeS3 crystallizes in the orthorhombic Pnma space group. Dy(1) is bonded to one S(2), three equivalent S(1), and three equivalent S(3) atoms to form distorted edge-sharing DyS7 pentagonal bipyramids. The Dy(1)-S(2) bond length is 2.79 Å. There are two shorter (2.78 Å) and one longer (2.95 Å) Dy(1)-S(1) bond length. There are two shorter (2.75 Å) and one longer (2.91 Å) Dy(1)-S(3) bond length. Ce(1) is bonded in a 8-coordinate geometry to two equivalent S(1), two equivalent S(3), and four equivalent S(2) atoms. Both Ce(1)-S(1) bond lengths are 2.95 Å. There is one shorter (3.10 Å) and one longer (3.16 Å) Ce(1)-S(3) bond length. There are two shorter (2.83 Å) and two longer (2.96 Å) Ce(1)-S(2) bond lengths. There are three inequivalent S sites. In the first S site, S(1) is bonded to three equivalent Dy(1) and two equivalent Ce(1) atoms to form distorted SCe2Dy3 trigonal bipyramids that share corners with six equivalent S(2)Ce4Dy square pyramids, corners with seven equivalent S(3)Ce2Dy3 trigonal bipyramids,  an edgeedge with one S(2)Ce4Dy square pyramid, edges with three equivalent S(3)Ce2Dy3 trigonal bipyramids, edges with four equivalent S(1)Ce2Dy3 trigonal bipyramids, and  a faceface with one S(2)Ce4Dy square pyramid. In the second S site, S(2) is bonded to one Dy(1) and four equivalent Ce(1) atoms to form distorted SCe4Dy square pyramids that share corners with four equivalent S(2)Ce4Dy square pyramids, corners with three equivalent S(3)Ce2Dy3 trigonal bipyramids, corners with six equivalent S(1)Ce2Dy3 trigonal bipyramids, edges with four equivalent S(2)Ce4Dy square pyramids,  an edgeedge with one S(1)Ce2Dy3 trigonal bipyramid, edges with four equivalent S(3)Ce2Dy3 trigonal bipyramids, and  a faceface with one S(1)Ce2Dy3 trigonal bipyramid. In the third S site, S(3) is bonded to three equivalent Dy(1) and two equivalent Ce(1) atoms to form distorted SCe2Dy3 trigonal bipyramids that share corners with three equivalent S(2)Ce4Dy square pyramids, corners with four equivalent S(3)Ce2Dy3 trigonal bipyramids, corners with seven equivalent S(1)Ce2Dy3 trigonal bipyramids, edges with four equivalent S(2)Ce4Dy square pyramids, edges with two equivalent S(3)Ce2Dy3 trigonal bipyramids, and edges with three equivalent S(1)Ce2Dy3 trigonal bipyramids.