USm2Te5 crystallizes in the orthorhombic Pmm2 space group. There are two inequivalent U sites. In the first U site, U(1) is bonded to one Te(5), two equivalent Te(9), and four equivalent Te(2) atoms to form distorted UTe7 pentagonal bipyramids that share corners with four equivalent U(1)Te7 pentagonal bipyramids, corners with four equivalent Sm(3)Te7 pentagonal bipyramids, edges with two equivalent U(1)Te7 pentagonal bipyramids, edges with four equivalent Sm(2)Te7 pentagonal bipyramids, and faces with two equivalent U(1)Te7 pentagonal bipyramids. In the second U site, U(2) is bonded in a 9-coordinate geometry to one Te(6), two equivalent Te(10), two equivalent Te(7), and four equivalent Te(3) atoms. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 9-coordinate geometry to one Te(1), two equivalent Te(10), two equivalent Te(7), and four equivalent Te(4) atoms. In the second Sm site, Sm(2) is bonded to one Te(2), two equivalent Te(8), and four equivalent Te(5) atoms to form distorted SmTe7 pentagonal bipyramids that share corners with four equivalent Sm(2)Te7 pentagonal bipyramids, corners with four equivalent Sm(4)Te7 pentagonal bipyramids, edges with two equivalent Sm(2)Te7 pentagonal bipyramids, edges with four equivalent U(1)Te7 pentagonal bipyramids, and faces with two equivalent Sm(2)Te7 pentagonal bipyramids. In the third Sm site, Sm(3) is bonded to one Te(3), two equivalent Te(9), and four equivalent Te(6) atoms to form distorted SmTe7 pentagonal bipyramids that share corners with four equivalent U(1)Te7 pentagonal bipyramids, corners with four equivalent Sm(3)Te7 pentagonal bipyramids, edges with two equivalent Sm(3)Te7 pentagonal bipyramids, and faces with two equivalent Sm(3)Te7 pentagonal bipyramids. In the fourth Sm site, Sm(4) is bonded to one Te(4), two equivalent Te(8), and four equivalent Te(1) atoms to form a mixture of distorted edge, face, and corner-sharing SmTe7 pentagonal bipyramids. There are ten inequivalent Te sites. In the first Te site, Te(1) is bonded to one Sm(1) and four equivalent Sm(4) atoms to form a mixture of distorted edge and corner-sharing TeSm5 trigonal bipyramids. In the second Te site, Te(2) is bonded to four equivalent U(1) and one Sm(2) atom to form distorted TeSmU4 trigonal bipyramids that share corners with four equivalent Te(2)SmU4 trigonal bipyramids, edges with four equivalent Te(5)Sm4U trigonal bipyramids, and edges with four equivalent Te(2)SmU4 trigonal bipyramids. In the third Te site, Te(3) is bonded to four equivalent U(2) and one Sm(3) atom to form distorted TeSmU4 trigonal bipyramids that share corners with four equivalent Te(3)SmU4 trigonal bipyramids, edges with four equivalent Te(6)Sm4U trigonal bipyramids, and edges with four equivalent Te(3)SmU4 trigonal bipyramids. In the fourth Te site, Te(4) is bonded to one Sm(4) and four equivalent Sm(1) atoms to form a mixture of distorted edge and corner-sharing TeSm5 trigonal bipyramids. In the fifth Te site, Te(5) is bonded to one U(1) and four equivalent Sm(2) atoms to form distorted TeSm4U trigonal bipyramids that share corners with four equivalent Te(5)Sm4U trigonal bipyramids, edges with four equivalent Te(5)Sm4U trigonal bipyramids, and edges with four equivalent Te(2)SmU4 trigonal bipyramids. In the sixth Te site, Te(6) is bonded to one U(2) and four equivalent Sm(3) atoms to form distorted TeSm4U trigonal bipyramids that share corners with four equivalent Te(6)Sm4U trigonal bipyramids, edges with four equivalent Te(6)Sm4U trigonal bipyramids, and edges with four equivalent Te(3)SmU4 trigonal bipyramids. In the seventh Te site, Te(7) is bonded in a 8-coordinate geometry to two equivalent U(2), two equivalent Sm(1), and four equivalent Te(10) atoms. In the eighth Te site, Te(8) is bonded in a 4-coordinate geometry to two equivalent Sm(2) and two equivalent Sm(4) atoms. In the ninth Te site, Te(9) is bonded in a 4-coordinate geometry to two equivalent U(1) and two equivalent Sm(3) atoms. In the tenth Te site, Te(10) is bonded in a 8-coordinate geometry to two equivalent U(2), two equivalent Sm(1), and four equivalent Te(7) atoms.
USm2Te5 crystallizes in the orthorhombic Pmm2 space group. There are two inequivalent U sites. In the first U site, U(1) is bonded to one Te(5), two equivalent Te(9), and four equivalent Te(2) atoms to form distorted UTe7 pentagonal bipyramids that share corners with four equivalent U(1)Te7 pentagonal bipyramids, corners with four equivalent Sm(3)Te7 pentagonal bipyramids, edges with two equivalent U(1)Te7 pentagonal bipyramids, edges with four equivalent Sm(2)Te7 pentagonal bipyramids, and faces with two equivalent U(1)Te7 pentagonal bipyramids. The U(1)-Te(5) bond length is 3.29 Å. Both U(1)-Te(9) bond lengths are 3.22 Å. All U(1)-Te(2) bond lengths are 3.23 Å. In the second U site, U(2) is bonded in a 9-coordinate geometry to one Te(6), two equivalent Te(10), two equivalent Te(7), and four equivalent Te(3) atoms. The U(2)-Te(6) bond length is 3.28 Å. Both U(2)-Te(10) bond lengths are 3.31 Å. Both U(2)-Te(7) bond lengths are 3.32 Å. All U(2)-Te(3) bond lengths are 3.24 Å. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 9-coordinate geometry to one Te(1), two equivalent Te(10), two equivalent Te(7), and four equivalent Te(4) atoms. The Sm(1)-Te(1) bond length is 3.26 Å. Both Sm(1)-Te(10) bond lengths are 3.32 Å. Both Sm(1)-Te(7) bond lengths are 3.31 Å. All Sm(1)-Te(4) bond lengths are 3.24 Å. In the second Sm site, Sm(2) is bonded to one Te(2), two equivalent Te(8), and four equivalent Te(5) atoms to form distorted SmTe7 pentagonal bipyramids that share corners with four equivalent Sm(2)Te7 pentagonal bipyramids, corners with four equivalent Sm(4)Te7 pentagonal bipyramids, edges with two equivalent Sm(2)Te7 pentagonal bipyramids, edges with four equivalent U(1)Te7 pentagonal bipyramids, and faces with two equivalent Sm(2)Te7 pentagonal bipyramids. The Sm(2)-Te(2) bond length is 3.30 Å. Both Sm(2)-Te(8) bond lengths are 3.19 Å. All Sm(2)-Te(5) bond lengths are 3.23 Å. In the third Sm site, Sm(3) is bonded to one Te(3), two equivalent Te(9), and four equivalent Te(6) atoms to form distorted SmTe7 pentagonal bipyramids that share corners with four equivalent U(1)Te7 pentagonal bipyramids, corners with four equivalent Sm(3)Te7 pentagonal bipyramids, edges with two equivalent Sm(3)Te7 pentagonal bipyramids, and faces with two equivalent Sm(3)Te7 pentagonal bipyramids. The Sm(3)-Te(3) bond length is 3.28 Å. Both Sm(3)-Te(9) bond lengths are 3.17 Å. All Sm(3)-Te(6) bond lengths are 3.24 Å. In the fourth Sm site, Sm(4) is bonded to one Te(4), two equivalent Te(8), and four equivalent Te(1) atoms to form a mixture of distorted edge, face, and corner-sharing SmTe7 pentagonal bipyramids. The Sm(4)-Te(4) bond length is 3.27 Å. Both Sm(4)-Te(8) bond lengths are 3.19 Å. All Sm(4)-Te(1) bond lengths are 3.24 Å. There are ten inequivalent Te sites. In the first Te site, Te(1) is bonded to one Sm(1) and four equivalent Sm(4) atoms to form a mixture of distorted edge and corner-sharing TeSm5 trigonal bipyramids. In the second Te site, Te(2) is bonded to four equivalent U(1) and one Sm(2) atom to form distorted TeSmU4 trigonal bipyramids that share corners with four equivalent Te(2)SmU4 trigonal bipyramids, edges with four equivalent Te(5)Sm4U trigonal bipyramids, and edges with four equivalent Te(2)SmU4 trigonal bipyramids. In the third Te site, Te(3) is bonded to four equivalent U(2) and one Sm(3) atom to form distorted TeSmU4 trigonal bipyramids that share corners with four equivalent Te(3)SmU4 trigonal bipyramids, edges with four equivalent Te(6)Sm4U trigonal bipyramids, and edges with four equivalent Te(3)SmU4 trigonal bipyramids. In the fourth Te site, Te(4) is bonded to one Sm(4) and four equivalent Sm(1) atoms to form a mixture of distorted edge and corner-sharing TeSm5 trigonal bipyramids. In the fifth Te site, Te(5) is bonded to one U(1) and four equivalent Sm(2) atoms to form distorted TeSm4U trigonal bipyramids that share corners with four equivalent Te(5)Sm4U trigonal bipyramids, edges with four equivalent Te(5)Sm4U trigonal bipyramids, and edges with four equivalent Te(2)SmU4 trigonal bipyramids. In the sixth Te site, Te(6) is bonded to one U(2) and four equivalent Sm(3) atoms to form distorted TeSm4U trigonal bipyramids that share corners with four equivalent Te(6)Sm4U trigonal bipyramids, edges with four equivalent Te(6)Sm4U trigonal bipyramids, and edges with four equivalent Te(3)SmU4 trigonal bipyramids. In the seventh Te site, Te(7) is bonded in a 8-coordinate geometry to two equivalent U(2), two equivalent Sm(1), and four equivalent Te(10) atoms. All Te(7)-Te(10) bond lengths are 3.11 Å. In the eighth Te site, Te(8) is bonded in a 4-coordinate geometry to two equivalent Sm(2) and two equivalent Sm(4) atoms. In the ninth Te site, Te(9) is bonded in a 4-coordinate geometry to two equivalent U(1) and two equivalent Sm(3) atoms. In the tenth Te site, Te(10) is bonded in a 8-coordinate geometry to two equivalent U(2), two equivalent Sm(1), and four equivalent Te(7) atoms.