Li2U3(SeO10)2 crystallizes in the monoclinic P2_1/c space group. Li(1) is bonded in a 6-coordinate geometry to one O(10), one O(2), one O(4), one O(9), and two equivalent O(8) atoms. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 2-coordinate geometry to two equivalent O(1), two equivalent O(3), two equivalent O(6), and two equivalent O(7) atoms. In the second U site, U(2) is bonded to one O(2), one O(4), one O(5), one O(6), one O(7), and two equivalent O(1) atoms to form distorted edge-sharing UO7 pentagonal bipyramids. Se(1) is bonded in a trigonal non-coplanar geometry to one O(5), one O(6), and one O(7) atom. There are ten inequivalent O sites. In the first O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one U(1), one U(2), and one Se(1) atom. In the second O site, O(7) is bonded in a 3-coordinate geometry to one U(1), one U(2), and one Se(1) atom. In the third O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Li(1) and one O(8) atom. In the fourth O site, O(1) is bonded in a trigonal planar geometry to one U(1) and two equivalent U(2) atoms. In the fifth O site, O(9) is bonded in a bent 120 degrees geometry to one Li(1) and one O(10) atom. In the sixth O site, O(2) is bonded in a linear geometry to one Li(1) and one U(2) atom. In the seventh O site, O(10) is bonded in a bent 120 degrees geometry to one Li(1) and one O(9) atom. In the eighth O site, O(3) is bonded in a single-bond geometry to one U(1) atom. In the ninth O site, O(4) is bonded in a linear geometry to one Li(1) and one U(2) atom. In the tenth O site, O(5) is bonded in a bent 120 degrees geometry to one U(2) and one Se(1) atom.
Li2U3(SeO10)2 crystallizes in the monoclinic P2_1/c space group. Li(1) is bonded in a 6-coordinate geometry to one O(10), one O(2), one O(4), one O(9), and two equivalent O(8) atoms. The Li(1)-O(10) bond length is 2.40 Å. The Li(1)-O(2) bond length is 1.92 Å. The Li(1)-O(4) bond length is 1.91 Å. The Li(1)-O(9) bond length is 2.31 Å. There is one shorter (2.33 Å) and one longer (2.48 Å) Li(1)-O(8) bond length. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 2-coordinate geometry to two equivalent O(1), two equivalent O(3), two equivalent O(6), and two equivalent O(7) atoms. Both U(1)-O(1) bond lengths are 2.34 Å. Both U(1)-O(3) bond lengths are 1.80 Å. Both U(1)-O(6) bond lengths are 2.58 Å. Both U(1)-O(7) bond lengths are 2.74 Å. In the second U site, U(2) is bonded to one O(2), one O(4), one O(5), one O(6), one O(7), and two equivalent O(1) atoms to form distorted edge-sharing UO7 pentagonal bipyramids. The U(2)-O(2) bond length is 1.87 Å. The U(2)-O(4) bond length is 1.88 Å. The U(2)-O(5) bond length is 2.40 Å. The U(2)-O(6) bond length is 2.45 Å. The U(2)-O(7) bond length is 2.41 Å. There is one shorter (2.24 Å) and one longer (2.25 Å) U(2)-O(1) bond length. Se(1) is bonded in a trigonal non-coplanar geometry to one O(5), one O(6), and one O(7) atom. The Se(1)-O(5) bond length is 1.72 Å. The Se(1)-O(6) bond length is 1.74 Å. The Se(1)-O(7) bond length is 1.73 Å. There are ten inequivalent O sites. In the first O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one U(1), one U(2), and one Se(1) atom. In the second O site, O(7) is bonded in a 3-coordinate geometry to one U(1), one U(2), and one Se(1) atom. In the third O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Li(1) and one O(8) atom. The O(8)-O(8) bond length is 1.24 Å. In the fourth O site, O(1) is bonded in a trigonal planar geometry to one U(1) and two equivalent U(2) atoms. In the fifth O site, O(9) is bonded in a bent 120 degrees geometry to one Li(1) and one O(10) atom. The O(9)-O(10) bond length is 1.23 Å. In the sixth O site, O(2) is bonded in a linear geometry to one Li(1) and one U(2) atom. In the seventh O site, O(10) is bonded in a bent 120 degrees geometry to one Li(1) and one O(9) atom. In the eighth O site, O(3) is bonded in a single-bond geometry to one U(1) atom. In the ninth O site, O(4) is bonded in a linear geometry to one Li(1) and one U(2) atom. In the tenth O site, O(5) is bonded in a bent 120 degrees geometry to one U(2) and one Se(1) atom.