U(BO2)4 crystallizes in the monoclinic C2/c space group. U(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(4) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form corner-sharing BO4 tetrahedra. In the second B site, B(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing BO4 tetrahedra. There are four inequivalent O sites. In the first O site, O(4) is bonded in a distorted single-bond geometry to two equivalent U(1) and one B(2) atom. In the second O site, O(1) is bonded in a trigonal planar geometry to one B(2) and two equivalent B(1) atoms. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to one U(1), one B(1), and one B(2) atom. In the fourth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one U(1), one B(1), and one B(2) atom.
U(BO2)4 crystallizes in the monoclinic C2/c space group. U(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(4) atoms. Both U(1)-O(2) bond lengths are 2.56 Å. Both U(1)-O(3) bond lengths are 2.49 Å. There are two shorter (2.31 Å) and two longer (2.35 Å) U(1)-O(4) bond lengths. There are two inequivalent B sites. In the first B site, B(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form corner-sharing BO4 tetrahedra. The B(1)-O(2) bond length is 1.45 Å. The B(1)-O(3) bond length is 1.45 Å. There is one shorter (1.50 Å) and one longer (1.54 Å) B(1)-O(1) bond length. In the second B site, B(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing BO4 tetrahedra. The B(2)-O(1) bond length is 1.53 Å. The B(2)-O(2) bond length is 1.45 Å. The B(2)-O(3) bond length is 1.46 Å. The B(2)-O(4) bond length is 1.47 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a distorted single-bond geometry to two equivalent U(1) and one B(2) atom. In the second O site, O(1) is bonded in a trigonal planar geometry to one B(2) and two equivalent B(1) atoms. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to one U(1), one B(1), and one B(2) atom. In the fourth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one U(1), one B(1), and one B(2) atom.