UTmTe4 crystallizes in the monoclinic Cm space group. U(1) is bonded in a 8-coordinate geometry to two equivalent Te(1), two equivalent Te(2), two equivalent Te(3), and two equivalent Te(4) atoms. Tm(1) is bonded in a 8-coordinate geometry to two equivalent Te(1), two equivalent Te(2), two equivalent Te(3), and two equivalent Te(4) atoms. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded to two equivalent U(1) and two equivalent Tm(1) atoms to form a mixture of corner and edge-sharing TeTm2U2 trigonal pyramids. In the second Te site, Te(2) is bonded to two equivalent U(1) and two equivalent Tm(1) atoms to form a mixture of distorted corner and edge-sharing TeTm2U2 trigonal pyramids. In the third Te site, Te(3) is bonded in a 6-coordinate geometry to two equivalent U(1), two equivalent Tm(1), and two equivalent Te(4) atoms. In the fourth Te site, Te(4) is bonded in a 6-coordinate geometry to two equivalent U(1), two equivalent Tm(1), and two equivalent Te(3) atoms.
UTmTe4 crystallizes in the monoclinic Cm space group. U(1) is bonded in a 8-coordinate geometry to two equivalent Te(1), two equivalent Te(2), two equivalent Te(3), and two equivalent Te(4) atoms. Both U(1)-Te(1) bond lengths are 3.09 Å. There is one shorter (3.22 Å) and one longer (3.23 Å) U(1)-Te(2) bond length. Both U(1)-Te(3) bond lengths are 3.24 Å. Both U(1)-Te(4) bond lengths are 3.26 Å. Tm(1) is bonded in a 8-coordinate geometry to two equivalent Te(1), two equivalent Te(2), two equivalent Te(3), and two equivalent Te(4) atoms. Both Tm(1)-Te(1) bond lengths are 3.19 Å. Both Tm(1)-Te(2) bond lengths are 3.00 Å. Both Tm(1)-Te(3) bond lengths are 3.31 Å. Both Tm(1)-Te(4) bond lengths are 3.29 Å. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded to two equivalent U(1) and two equivalent Tm(1) atoms to form a mixture of corner and edge-sharing TeTm2U2 trigonal pyramids. In the second Te site, Te(2) is bonded to two equivalent U(1) and two equivalent Tm(1) atoms to form a mixture of distorted corner and edge-sharing TeTm2U2 trigonal pyramids. In the third Te site, Te(3) is bonded in a 6-coordinate geometry to two equivalent U(1), two equivalent Tm(1), and two equivalent Te(4) atoms. There is one shorter (3.03 Å) and one longer (3.08 Å) Te(3)-Te(4) bond length. In the fourth Te site, Te(4) is bonded in a 6-coordinate geometry to two equivalent U(1), two equivalent Tm(1), and two equivalent Te(3) atoms.