KU(SeO4)2 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(8), and two equivalent O(7) atoms. U(1) is bonded in a distorted pentagonal bipyramidal geometry to one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(2), and one O(6) atom. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(3), one O(4), and one O(5) atom. There are eight inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one K(1), one U(1), and one Se(2) atom. In the second O site, O(6) is bonded in a distorted trigonal planar geometry to one K(1), one U(1), and one Se(1) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to two equivalent K(1) and one U(1) atom. In the fourth O site, O(8) is bonded in a distorted single-bond geometry to one K(1) and one U(1) atom. In the fifth O site, O(1) is bonded in a distorted single-bond geometry to one K(1) and one Se(1) atom. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to one K(1), one U(1), and one Se(1) atom. In the seventh O site, O(3) is bonded in a bent 120 degrees geometry to one U(1) and one Se(2) atom. In the eighth O site, O(4) is bonded in a 2-coordinate geometry to one K(1), one U(1), and one Se(2) atom.
KU(SeO4)2 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(8), and two equivalent O(7) atoms. The K(1)-O(1) bond length is 3.06 Å. The K(1)-O(2) bond length is 2.98 Å. The K(1)-O(4) bond length is 3.15 Å. The K(1)-O(5) bond length is 3.04 Å. The K(1)-O(6) bond length is 2.86 Å. The K(1)-O(8) bond length is 2.86 Å. There is one shorter (2.85 Å) and one longer (3.19 Å) K(1)-O(7) bond length. U(1) is bonded in a distorted pentagonal bipyramidal geometry to one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. The U(1)-O(2) bond length is 2.46 Å. The U(1)-O(3) bond length is 2.33 Å. The U(1)-O(4) bond length is 2.36 Å. The U(1)-O(5) bond length is 2.33 Å. The U(1)-O(6) bond length is 2.43 Å. The U(1)-O(7) bond length is 1.84 Å. The U(1)-O(8) bond length is 1.82 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(2), and one O(6) atom. The Se(1)-O(1) bond length is 1.67 Å. The Se(1)-O(2) bond length is 1.72 Å. The Se(1)-O(6) bond length is 1.71 Å. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(3), one O(4), and one O(5) atom. The Se(2)-O(3) bond length is 1.74 Å. The Se(2)-O(4) bond length is 1.74 Å. The Se(2)-O(5) bond length is 1.72 Å. There are eight inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one K(1), one U(1), and one Se(2) atom. In the second O site, O(6) is bonded in a distorted trigonal planar geometry to one K(1), one U(1), and one Se(1) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to two equivalent K(1) and one U(1) atom. In the fourth O site, O(8) is bonded in a distorted single-bond geometry to one K(1) and one U(1) atom. In the fifth O site, O(1) is bonded in a distorted single-bond geometry to one K(1) and one Se(1) atom. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to one K(1), one U(1), and one Se(1) atom. In the seventh O site, O(3) is bonded in a bent 120 degrees geometry to one U(1) and one Se(2) atom. In the eighth O site, O(4) is bonded in a 2-coordinate geometry to one K(1), one U(1), and one Se(2) atom.