ULa2Te5 crystallizes in the monoclinic C2 space group. U(1) is bonded in a 8-coordinate geometry to one Te(1), one Te(4), one Te(5), one Te(6), two equivalent Te(2), and two equivalent Te(3) atoms. There are two inequivalent La sites. In the first La site, La(1) is bonded to one Te(2), one Te(3), two equivalent Te(4), and three equivalent Te(1) atoms to form a mixture of distorted corner and edge-sharing LaTe7 pentagonal bipyramids. In the second La site, La(2) is bonded in a 8-coordinate geometry to one Te(1), one Te(4), one Te(5), one Te(6), two equivalent Te(2), and two equivalent Te(3) atoms. There are six inequivalent Te sites. In the first Te site, Te(1) is bonded to one U(1), one La(2), and three equivalent La(1) atoms to form distorted TeLa4U trigonal bipyramids that share  a cornercorner with one Te(2)La3U2 trigonal bipyramid,  a cornercorner with one Te(3)La3U2 trigonal bipyramid, corners with two equivalent Te(1)La4U trigonal bipyramids, edges with two equivalent Te(1)La4U trigonal bipyramids, edges with three equivalent Te(2)La3U2 trigonal bipyramids, and edges with three equivalent Te(3)La3U2 trigonal bipyramids. In the second Te site, Te(2) is bonded to two equivalent U(1), one La(1), and two equivalent La(2) atoms to form distorted TeLa3U2 trigonal bipyramids that share  a cornercorner with one Te(3)La3U2 trigonal bipyramid,  a cornercorner with one Te(1)La4U trigonal bipyramid, corners with two equivalent Te(2)La3U2 trigonal bipyramids,  an edgeedge with one Te(2)La3U2 trigonal bipyramid, edges with three equivalent Te(1)La4U trigonal bipyramids, and edges with four equivalent Te(3)La3U2 trigonal bipyramids. In the third Te site, Te(3) is bonded to two equivalent U(1), one La(1), and two equivalent La(2) atoms to form distorted TeLa3U2 trigonal bipyramids that share  a cornercorner with one Te(2)La3U2 trigonal bipyramid,  a cornercorner with one Te(1)La4U trigonal bipyramid, corners with two equivalent Te(3)La3U2 trigonal bipyramids,  an edgeedge with one Te(3)La3U2 trigonal bipyramid, edges with three equivalent Te(1)La4U trigonal bipyramids, and edges with four equivalent Te(2)La3U2 trigonal bipyramids. In the fourth Te site, Te(4) is bonded in a 4-coordinate geometry to one U(1), one La(2), and two equivalent La(1) atoms. In the fifth Te site, Te(5) is bonded in a 6-coordinate geometry to two equivalent U(1), two equivalent La(2), and two equivalent Te(6) atoms. In the sixth Te site, Te(6) is bonded in a 4-coordinate geometry to two equivalent U(1), two equivalent La(2), and two equivalent Te(5) atoms.
ULa2Te5 crystallizes in the monoclinic C2 space group. U(1) is bonded in a 8-coordinate geometry to one Te(1), one Te(4), one Te(5), one Te(6), two equivalent Te(2), and two equivalent Te(3) atoms. The U(1)-Te(1) bond length is 3.21 Å. The U(1)-Te(4) bond length is 3.31 Å. The U(1)-Te(5) bond length is 3.27 Å. The U(1)-Te(6) bond length is 3.16 Å. Both U(1)-Te(2) bond lengths are 3.28 Å. There is one shorter (3.21 Å) and one longer (3.29 Å) U(1)-Te(3) bond length. There are two inequivalent La sites. In the first La site, La(1) is bonded to one Te(2), one Te(3), two equivalent Te(4), and three equivalent Te(1) atoms to form a mixture of distorted corner and edge-sharing LaTe7 pentagonal bipyramids. The La(1)-Te(2) bond length is 3.36 Å. The La(1)-Te(3) bond length is 3.27 Å. Both La(1)-Te(4) bond lengths are 3.15 Å. There are two shorter (3.24 Å) and one longer (3.33 Å) La(1)-Te(1) bond length. In the second La site, La(2) is bonded in a 8-coordinate geometry to one Te(1), one Te(4), one Te(5), one Te(6), two equivalent Te(2), and two equivalent Te(3) atoms. The La(2)-Te(1) bond length is 3.31 Å. The La(2)-Te(4) bond length is 3.35 Å. The La(2)-Te(5) bond length is 3.34 Å. The La(2)-Te(6) bond length is 3.28 Å. There is one shorter (3.25 Å) and one longer (3.30 Å) La(2)-Te(2) bond length. There is one shorter (3.36 Å) and one longer (3.38 Å) La(2)-Te(3) bond length. There are six inequivalent Te sites. In the first Te site, Te(1) is bonded to one U(1), one La(2), and three equivalent La(1) atoms to form distorted TeLa4U trigonal bipyramids that share  a cornercorner with one Te(2)La3U2 trigonal bipyramid,  a cornercorner with one Te(3)La3U2 trigonal bipyramid, corners with two equivalent Te(1)La4U trigonal bipyramids, edges with two equivalent Te(1)La4U trigonal bipyramids, edges with three equivalent Te(2)La3U2 trigonal bipyramids, and edges with three equivalent Te(3)La3U2 trigonal bipyramids. In the second Te site, Te(2) is bonded to two equivalent U(1), one La(1), and two equivalent La(2) atoms to form distorted TeLa3U2 trigonal bipyramids that share  a cornercorner with one Te(3)La3U2 trigonal bipyramid,  a cornercorner with one Te(1)La4U trigonal bipyramid, corners with two equivalent Te(2)La3U2 trigonal bipyramids,  an edgeedge with one Te(2)La3U2 trigonal bipyramid, edges with three equivalent Te(1)La4U trigonal bipyramids, and edges with four equivalent Te(3)La3U2 trigonal bipyramids. In the third Te site, Te(3) is bonded to two equivalent U(1), one La(1), and two equivalent La(2) atoms to form distorted TeLa3U2 trigonal bipyramids that share  a cornercorner with one Te(2)La3U2 trigonal bipyramid,  a cornercorner with one Te(1)La4U trigonal bipyramid, corners with two equivalent Te(3)La3U2 trigonal bipyramids,  an edgeedge with one Te(3)La3U2 trigonal bipyramid, edges with three equivalent Te(1)La4U trigonal bipyramids, and edges with four equivalent Te(2)La3U2 trigonal bipyramids. In the fourth Te site, Te(4) is bonded in a 4-coordinate geometry to one U(1), one La(2), and two equivalent La(1) atoms. In the fifth Te site, Te(5) is bonded in a 6-coordinate geometry to two equivalent U(1), two equivalent La(2), and two equivalent Te(6) atoms. There is one shorter (3.09 Å) and one longer (3.17 Å) Te(5)-Te(6) bond length. In the sixth Te site, Te(6) is bonded in a 4-coordinate geometry to two equivalent U(1), two equivalent La(2), and two equivalent Te(5) atoms.