U2Ta3Ge4 crystallizes in the orthorhombic Pnma space group. U(1) is bonded in a 7-coordinate geometry to one Ge(2), two equivalent Ge(3), and four equivalent Ge(1) atoms. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 6-coordinate geometry to one Ge(3), two equivalent Ge(2), and three equivalent Ge(1) atoms. In the second Ta site, Ta(2) is bonded to two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(3) atoms to form distorted corner-sharing TaGe6 octahedra. The corner-sharing octahedral tilt angles range from 46-53°. There are three inequivalent Ge sites. In the first Ge site, Ge(3) is bonded in a 9-coordinate geometry to four equivalent U(1), two equivalent Ta(1), two equivalent Ta(2), and one Ge(2) atom. In the second Ge site, Ge(1) is bonded in a 9-coordinate geometry to four equivalent U(1), one Ta(2), three equivalent Ta(1), and one Ge(1) atom. In the third Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent U(1), two equivalent Ta(2), four equivalent Ta(1), and one Ge(3) atom.
U2Ta3Ge4 crystallizes in the orthorhombic Pnma space group. U(1) is bonded in a 7-coordinate geometry to one Ge(2), two equivalent Ge(3), and four equivalent Ge(1) atoms. The U(1)-Ge(2) bond length is 2.99 Å. There is one shorter (2.88 Å) and one longer (3.01 Å) U(1)-Ge(3) bond length. There are a spread of U(1)-Ge(1) bond distances ranging from 2.86-3.01 Å. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 6-coordinate geometry to one Ge(3), two equivalent Ge(2), and three equivalent Ge(1) atoms. The Ta(1)-Ge(3) bond length is 2.78 Å. There is one shorter (2.67 Å) and one longer (2.72 Å) Ta(1)-Ge(2) bond length. There are a spread of Ta(1)-Ge(1) bond distances ranging from 2.62-2.74 Å. In the second Ta site, Ta(2) is bonded to two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(3) atoms to form distorted corner-sharing TaGe6 octahedra. The corner-sharing octahedral tilt angles range from 46-53°. Both Ta(2)-Ge(1) bond lengths are 2.79 Å. There is one shorter (2.75 Å) and one longer (2.83 Å) Ta(2)-Ge(2) bond length. Both Ta(2)-Ge(3) bond lengths are 2.74 Å. There are three inequivalent Ge sites. In the first Ge site, Ge(3) is bonded in a 9-coordinate geometry to four equivalent U(1), two equivalent Ta(1), two equivalent Ta(2), and one Ge(2) atom. The Ge(3)-Ge(2) bond length is 2.68 Å. In the second Ge site, Ge(1) is bonded in a 9-coordinate geometry to four equivalent U(1), one Ta(2), three equivalent Ta(1), and one Ge(1) atom. The Ge(1)-Ge(1) bond length is 2.79 Å. In the third Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent U(1), two equivalent Ta(2), four equivalent Ta(1), and one Ge(3) atom.