ThSe2O7 crystallizes in the monoclinic P2_1/c space group. Th(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(5), one O(6), one O(7), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(3), one O(4), and one O(5) atom. In the second Se site, Se(2) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(6), and one O(7) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Th(1) and one Se(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Th(1) and one Se(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Th(1) and one Se(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Th(1) and one Se(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Th(1) and one Se(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Th(1) and one Se(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Th(1) and one Se(2) atom.
ThSe2O7 crystallizes in the monoclinic P2_1/c space group. Th(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(5), one O(6), one O(7), two equivalent O(3), and two equivalent O(4) atoms. The Th(1)-O(1) bond length is 2.48 Å. The Th(1)-O(2) bond length is 2.41 Å. The Th(1)-O(5) bond length is 2.35 Å. The Th(1)-O(6) bond length is 2.44 Å. The Th(1)-O(7) bond length is 2.48 Å. There is one shorter (2.44 Å) and one longer (2.63 Å) Th(1)-O(3) bond length. There is one shorter (2.47 Å) and one longer (2.55 Å) Th(1)-O(4) bond length. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(3), one O(4), and one O(5) atom. The Se(1)-O(3) bond length is 1.74 Å. The Se(1)-O(4) bond length is 1.73 Å. The Se(1)-O(5) bond length is 1.69 Å. In the second Se site, Se(2) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(6), and one O(7) atom. The Se(2)-O(1) bond length is 1.64 Å. The Se(2)-O(2) bond length is 1.64 Å. The Se(2)-O(6) bond length is 1.65 Å. The Se(2)-O(7) bond length is 1.65 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Th(1) and one Se(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Th(1) and one Se(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Th(1) and one Se(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Th(1) and one Se(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Th(1) and one Se(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Th(1) and one Se(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Th(1) and one Se(2) atom.