Th(BO2)4 crystallizes in the monoclinic C2/c space group. Th(1) is bonded in a 10-coordinate geometry to two equivalent O(2), two equivalent O(3), and six 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 three equivalent Th(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 Th(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 Th(1), one B(1), and one B(2) atom.
Th(BO2)4 crystallizes in the monoclinic C2/c space group. Th(1) is bonded in a 10-coordinate geometry to two equivalent O(2), two equivalent O(3), and six equivalent O(4) atoms. Both Th(1)-O(2) bond lengths are 2.54 Å. Both Th(1)-O(3) bond lengths are 2.60 Å. There are a spread of Th(1)-O(4) bond distances ranging from 2.40-2.87 Å. 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 1.44 Å. The B(1)-O(3) bond length is 1.44 Å. There is one shorter (1.49 Å) and one longer (1.52 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 1.52 Å. The B(2)-O(2) bond length is 1.45 Å. The B(2)-O(3) bond length is 1.45 Å. The B(2)-O(4) bond length is 1.46 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a distorted single-bond geometry to three equivalent Th(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 Th(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 Th(1), one B(1), and one B(2) atom.