U crystallizes in the orthorhombic Cmmm space group. There are three inequivalent U sites. In the first U site, U(1) is bonded to two equivalent U(1), two equivalent U(3), and four equivalent U(2) atoms to form a mixture of distorted corner and edge-sharing UU8 hexagonal bipyramids. In the second U site, U(2) is bonded to two equivalent U(1), two equivalent U(3), and four equivalent U(2) atoms to form a mixture of corner and edge-sharing UU8 hexagonal bipyramids. In the third U site, U(3) is bonded to two equivalent U(1), two equivalent U(3), and four equivalent U(2) atoms to form a mixture of corner and edge-sharing UU8 hexagonal bipyramids.
U crystallizes in the orthorhombic Cmmm space group. There are three inequivalent U sites. In the first U site, U(1) is bonded to two equivalent U(1), two equivalent U(3), and four equivalent U(2) atoms to form a mixture of distorted corner and edge-sharing UU8 hexagonal bipyramids. There is one shorter (2.53 Å) and one longer (3.29 Å) U(1)-U(1) bond length. Both U(1)-U(3) bond lengths are 2.85 Å. All U(1)-U(2) bond lengths are 2.91 Å. In the second U site, U(2) is bonded to two equivalent U(1), two equivalent U(3), and four equivalent U(2) atoms to form a mixture of corner and edge-sharing UU8 hexagonal bipyramids. Both U(2)-U(3) bond lengths are 2.91 Å. There are a spread of U(2)-U(2) bond distances ranging from 2.57-3.26 Å. In the third U site, U(3) is bonded to two equivalent U(1), two equivalent U(3), and four equivalent U(2) atoms to form a mixture of corner and edge-sharing UU8 hexagonal bipyramids. Both U(3)-U(3) bond lengths are 2.91 Å.