U2PrS5 crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent U sites. In the first U site, U(1) is bonded to one S(3), one S(4), one S(5), two equivalent S(1), and two equivalent S(2) atoms to form distorted edge-sharing US7 pentagonal bipyramids. In the second U site, U(2) is bonded in a 8-coordinate geometry to one S(1), one S(2), two equivalent S(3), two equivalent S(4), and two equivalent S(5) atoms. Pr(1) is bonded in a 8-coordinate geometry to one S(1), one S(2), two equivalent S(3), two equivalent S(4), and two equivalent S(5) atoms. There are five inequivalent S sites. In the first S site, S(1) is bonded to one U(2), two equivalent U(1), and one Pr(1) atom to form distorted SPrU3 tetrahedra that share corners with two equivalent S(3)Pr2U3 square pyramids, corners with four equivalent S(5)Pr2U3 square pyramids, corners with two equivalent S(1)PrU3 tetrahedra, corners with two equivalent S(4)Pr2U3 trigonal bipyramids, corners with four equivalent S(2)PrU3 trigonal pyramids,  an edgeedge with one S(5)Pr2U3 square pyramid, edges with two equivalent S(3)Pr2U3 square pyramids, edges with two equivalent S(4)Pr2U3 trigonal bipyramids, and  an edgeedge with one S(2)PrU3 trigonal pyramid. In the second S site, S(2) is bonded to one U(2), two equivalent U(1), and one Pr(1) atom to form distorted SPrU3 trigonal pyramids that share corners with two equivalent S(3)Pr2U3 square pyramids, corners with four equivalent S(5)Pr2U3 square pyramids, corners with four equivalent S(1)PrU3 tetrahedra, corners with two equivalent S(4)Pr2U3 trigonal bipyramids, corners with two equivalent S(2)PrU3 trigonal pyramids,  an edgeedge with one S(5)Pr2U3 square pyramid, edges with two equivalent S(3)Pr2U3 square pyramids,  an edgeedge with one S(1)PrU3 tetrahedra, and edges with two equivalent S(4)Pr2U3 trigonal bipyramids. In the third S site, S(3) is bonded to one U(1), two equivalent U(2), and two equivalent Pr(1) atoms to form distorted SPr2U3 square pyramids that share corners with four equivalent S(3)Pr2U3 square pyramids, corners with four equivalent S(5)Pr2U3 square pyramids, corners with two equivalent S(1)PrU3 tetrahedra,  a cornercorner with one S(4)Pr2U3 trigonal bipyramid, corners with two equivalent S(2)PrU3 trigonal pyramids,  an edgeedge with one S(5)Pr2U3 square pyramid, edges with two equivalent S(1)PrU3 tetrahedra, edges with four equivalent S(4)Pr2U3 trigonal bipyramids, edges with two equivalent S(2)PrU3 trigonal pyramids, and  a faceface with one S(5)Pr2U3 square pyramid. In the fourth S site, S(4) is bonded to one U(1), two equivalent U(2), and two equivalent Pr(1) atoms to form distorted SPr2U3 trigonal bipyramids that share  a cornercorner with one S(3)Pr2U3 square pyramid, corners with five equivalent S(5)Pr2U3 square pyramids, corners with two equivalent S(1)PrU3 tetrahedra, corners with four equivalent S(4)Pr2U3 trigonal bipyramids, corners with two equivalent S(2)PrU3 trigonal pyramids, edges with two equivalent S(5)Pr2U3 square pyramids, edges with four equivalent S(3)Pr2U3 square pyramids, edges with two equivalent S(1)PrU3 tetrahedra, and edges with two equivalent S(2)PrU3 trigonal pyramids. In the fifth S site, S(5) is bonded to one U(1), two equivalent U(2), and two equivalent Pr(1) atoms to form SPr2U3 square pyramids that share corners with four equivalent S(3)Pr2U3 square pyramids, corners with four equivalent S(1)PrU3 tetrahedra, corners with five equivalent S(4)Pr2U3 trigonal bipyramids, corners with four equivalent S(2)PrU3 trigonal pyramids,  an edgeedge with one S(3)Pr2U3 square pyramid, edges with two equivalent S(5)Pr2U3 square pyramids,  an edgeedge with one S(1)PrU3 tetrahedra, edges with two equivalent S(4)Pr2U3 trigonal bipyramids,  an edgeedge with one S(2)PrU3 trigonal pyramid, and  a faceface with one S(3)Pr2U3 square pyramid.
U2PrS5 crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent U sites. In the first U site, U(1) is bonded to one S(3), one S(4), one S(5), two equivalent S(1), and two equivalent S(2) atoms to form distorted edge-sharing US7 pentagonal bipyramids. The U(1)-S(3) bond length is 2.80 Å. The U(1)-S(4) bond length is 2.79 Å. The U(1)-S(5) bond length is 2.86 Å. There is one shorter (2.65 Å) and one longer (2.70 Å) U(1)-S(1) bond length. There is one shorter (2.68 Å) and one longer (2.74 Å) U(1)-S(2) bond length. In the second U site, U(2) is bonded in a 8-coordinate geometry to one S(1), one S(2), two equivalent S(3), two equivalent S(4), and two equivalent S(5) atoms. The U(2)-S(1) bond length is 2.81 Å. The U(2)-S(2) bond length is 2.82 Å. There is one shorter (2.86 Å) and one longer (2.93 Å) U(2)-S(3) bond length. There is one shorter (2.92 Å) and one longer (3.06 Å) U(2)-S(4) bond length. There is one shorter (2.94 Å) and one longer (2.95 Å) U(2)-S(5) bond length. Pr(1) is bonded in a 8-coordinate geometry to one S(1), one S(2), two equivalent S(3), two equivalent S(4), and two equivalent S(5) atoms. The Pr(1)-S(1) bond length is 2.93 Å. The Pr(1)-S(2) bond length is 2.94 Å. There is one shorter (2.90 Å) and one longer (2.92 Å) Pr(1)-S(3) bond length. There is one shorter (2.95 Å) and one longer (3.04 Å) Pr(1)-S(4) bond length. Both Pr(1)-S(5) bond lengths are 2.92 Å. There are five inequivalent S sites. In the first S site, S(1) is bonded to one U(2), two equivalent U(1), and one Pr(1) atom to form distorted SPrU3 tetrahedra that share corners with two equivalent S(3)Pr2U3 square pyramids, corners with four equivalent S(5)Pr2U3 square pyramids, corners with two equivalent S(1)PrU3 tetrahedra, corners with two equivalent S(4)Pr2U3 trigonal bipyramids, corners with four equivalent S(2)PrU3 trigonal pyramids,  an edgeedge with one S(5)Pr2U3 square pyramid, edges with two equivalent S(3)Pr2U3 square pyramids, edges with two equivalent S(4)Pr2U3 trigonal bipyramids, and  an edgeedge with one S(2)PrU3 trigonal pyramid. In the second S site, S(2) is bonded to one U(2), two equivalent U(1), and one Pr(1) atom to form distorted SPrU3 trigonal pyramids that share corners with two equivalent S(3)Pr2U3 square pyramids, corners with four equivalent S(5)Pr2U3 square pyramids, corners with four equivalent S(1)PrU3 tetrahedra, corners with two equivalent S(4)Pr2U3 trigonal bipyramids, corners with two equivalent S(2)PrU3 trigonal pyramids,  an edgeedge with one S(5)Pr2U3 square pyramid, edges with two equivalent S(3)Pr2U3 square pyramids,  an edgeedge with one S(1)PrU3 tetrahedra, and edges with two equivalent S(4)Pr2U3 trigonal bipyramids. In the third S site, S(3) is bonded to one U(1), two equivalent U(2), and two equivalent Pr(1) atoms to form distorted SPr2U3 square pyramids that share corners with four equivalent S(3)Pr2U3 square pyramids, corners with four equivalent S(5)Pr2U3 square pyramids, corners with two equivalent S(1)PrU3 tetrahedra,  a cornercorner with one S(4)Pr2U3 trigonal bipyramid, corners with two equivalent S(2)PrU3 trigonal pyramids,  an edgeedge with one S(5)Pr2U3 square pyramid, edges with two equivalent S(1)PrU3 tetrahedra, edges with four equivalent S(4)Pr2U3 trigonal bipyramids, edges with two equivalent S(2)PrU3 trigonal pyramids, and  a faceface with one S(5)Pr2U3 square pyramid. In the fourth S site, S(4) is bonded to one U(1), two equivalent U(2), and two equivalent Pr(1) atoms to form distorted SPr2U3 trigonal bipyramids that share  a cornercorner with one S(3)Pr2U3 square pyramid, corners with five equivalent S(5)Pr2U3 square pyramids, corners with two equivalent S(1)PrU3 tetrahedra, corners with four equivalent S(4)Pr2U3 trigonal bipyramids, corners with two equivalent S(2)PrU3 trigonal pyramids, edges with two equivalent S(5)Pr2U3 square pyramids, edges with four equivalent S(3)Pr2U3 square pyramids, edges with two equivalent S(1)PrU3 tetrahedra, and edges with two equivalent S(2)PrU3 trigonal pyramids. In the fifth S site, S(5) is bonded to one U(1), two equivalent U(2), and two equivalent Pr(1) atoms to form SPr2U3 square pyramids that share corners with four equivalent S(3)Pr2U3 square pyramids, corners with four equivalent S(1)PrU3 tetrahedra, corners with five equivalent S(4)Pr2U3 trigonal bipyramids, corners with four equivalent S(2)PrU3 trigonal pyramids,  an edgeedge with one S(3)Pr2U3 square pyramid, edges with two equivalent S(5)Pr2U3 square pyramids,  an edgeedge with one S(1)PrU3 tetrahedra, edges with two equivalent S(4)Pr2U3 trigonal bipyramids,  an edgeedge with one S(2)PrU3 trigonal pyramid, and  a faceface with one S(3)Pr2U3 square pyramid.