U crystallizes in the orthorhombic Pmma space group. There are five inequivalent U sites. In the first U site, U(1) is bonded to two equivalent U(1), two equivalent U(4), and four equivalent U(3) 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(2), two equivalent U(4), and four equivalent U(5) atoms to form a mixture of distorted corner and edge-sharing UU8 hexagonal bipyramids. In the third U site, U(3) is bonded to one U(5), two equivalent U(1), two equivalent U(4), and three equivalent U(3) atoms to form a mixture of distorted corner and edge-sharing UU8 hexagonal bipyramids. In the fourth U site, U(4) is bonded to one U(1), one U(2), two equivalent U(3), two equivalent U(4), and two equivalent U(5) atoms to form a mixture of corner and edge-sharing UU8 hexagonal bipyramids. In the fifth U site, U(5) is bonded to one U(3), two equivalent U(2), two equivalent U(4), and three equivalent U(5) atoms to form a mixture of corner and edge-sharing UU8 hexagonal bipyramids.
U crystallizes in the orthorhombic Pmma space group. There are five inequivalent U sites. In the first U site, U(1) is bonded to two equivalent U(1), two equivalent U(4), and four equivalent U(3) atoms to form a mixture of distorted corner and edge-sharing UU8 hexagonal bipyramids. There is one shorter (2.53 Å) and one longer (3.34 Å) U(1)-U(1) bond length. Both U(1)-U(4) bond lengths are 2.83 Å. There are two shorter (2.90 Å) and two longer (2.93 Å) U(1)-U(3) bond lengths. In the second U site, U(2) is bonded to two equivalent U(2), two equivalent U(4), and four equivalent U(5) atoms to form a mixture of distorted corner and edge-sharing UU8 hexagonal bipyramids. There is one shorter (2.56 Å) and one longer (3.31 Å) U(2)-U(2) bond length. Both U(2)-U(4) bond lengths are 2.88 Å. All U(2)-U(5) bond lengths are 2.92 Å. In the third U site, U(3) is bonded to one U(5), two equivalent U(1), two equivalent U(4), and three equivalent U(3) atoms to form a mixture of distorted corner and edge-sharing UU8 hexagonal bipyramids. The U(3)-U(5) bond length is 2.91 Å. There is one shorter (2.91 Å) and one longer (2.95 Å) U(3)-U(4) bond length. There are a spread of U(3)-U(3) bond distances ranging from 2.55-3.32 Å. In the fourth U site, U(4) is bonded to one U(1), one U(2), two equivalent U(3), two equivalent U(4), and two equivalent U(5) atoms to form a mixture of corner and edge-sharing UU8 hexagonal bipyramids. There is one shorter (2.61 Å) and one longer (3.25 Å) U(4)-U(4) bond length. There is one shorter (2.90 Å) and one longer (2.93 Å) U(4)-U(5) bond length. In the fifth U site, U(5) is bonded to one U(3), two equivalent U(2), two equivalent U(4), and three equivalent U(5) atoms to form a mixture of corner and edge-sharing UU8 hexagonal bipyramids. There are a spread of U(5)-U(5) bond distances ranging from 2.62-3.25 Å.