UCu4(SeO7)2 crystallizes in the orthorhombic Pmn2_1 space group. U(1) is bonded in an octahedral geometry to one O(1), one O(2), two equivalent O(5), and two equivalent O(6) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(3), one O(8), two equivalent O(10), and two equivalent O(9) atoms to form distorted edge-sharing CuO6 octahedra. In the second Cu site, Cu(2) is bonded to one O(4), one O(7), two equivalent O(10), and two equivalent O(9) atoms to form distorted edge-sharing CuO6 octahedra. In the third Cu site, Cu(3) is bonded to one O(10), one O(3), one O(4), one O(7), one O(8), and one O(9) atom to form distorted edge-sharing CuO6 octahedra. 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) and two equivalent O(5) atoms. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(4) and two equivalent O(6) atoms. There are ten inequivalent O sites. In the first O site, O(8) is bonded in a distorted water-like geometry to one Cu(1) and two equivalent Cu(3) atoms. In the second O site, O(9) is bonded in a trigonal non-coplanar geometry to one Cu(1), one Cu(2), and one Cu(3) atom. In the third O site, O(10) is bonded in a trigonal non-coplanar geometry to one Cu(1), one Cu(2), and one Cu(3) atom. In the fourth O site, O(1) is bonded in a single-bond geometry to one U(1) atom. In the fifth O site, O(2) is bonded in a single-bond geometry to one U(1) atom. In the sixth O site, O(3) is bonded in a 4-coordinate geometry to one Cu(1), two equivalent Cu(3), and one Se(1) atom. In the seventh O site, O(4) is bonded in a 4-coordinate geometry to one Cu(2), two equivalent Cu(3), and one Se(2) atom. In the eighth O site, O(5) is bonded in a bent 150 degrees geometry to one U(1) and one Se(1) atom. In the ninth O site, O(6) is bonded in a bent 150 degrees geometry to one U(1) and one Se(2) atom. In the tenth O site, O(7) is bonded in a distorted water-like geometry to one Cu(2) and two equivalent Cu(3) atoms.
UCu4(SeO7)2 crystallizes in the orthorhombic Pmn2_1 space group. U(1) is bonded in an octahedral geometry to one O(1), one O(2), two equivalent O(5), and two equivalent O(6) atoms. The U(1)-O(1) bond length is 1.82 Å. The U(1)-O(2) bond length is 1.82 Å. Both U(1)-O(5) bond lengths are 2.26 Å. Both U(1)-O(6) bond lengths are 2.26 Å. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(3), one O(8), two equivalent O(10), and two equivalent O(9) atoms to form distorted edge-sharing CuO6 octahedra. The Cu(1)-O(3) bond length is 2.41 Å. The Cu(1)-O(8) bond length is 2.39 Å. Both Cu(1)-O(10) bond lengths are 1.91 Å. Both Cu(1)-O(9) bond lengths are 1.88 Å. In the second Cu site, Cu(2) is bonded to one O(4), one O(7), two equivalent O(10), and two equivalent O(9) atoms to form distorted edge-sharing CuO6 octahedra. The Cu(2)-O(4) bond length is 2.26 Å. The Cu(2)-O(7) bond length is 2.36 Å. Both Cu(2)-O(10) bond lengths are 1.90 Å. Both Cu(2)-O(9) bond lengths are 1.92 Å. In the third Cu site, Cu(3) is bonded to one O(10), one O(3), one O(4), one O(7), one O(8), and one O(9) atom to form distorted edge-sharing CuO6 octahedra. The Cu(3)-O(10) bond length is 1.88 Å. The Cu(3)-O(3) bond length is 2.41 Å. The Cu(3)-O(4) bond length is 2.46 Å. The Cu(3)-O(7) bond length is 1.82 Å. The Cu(3)-O(8) bond length is 1.81 Å. The Cu(3)-O(9) bond length is 1.87 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(3) and two equivalent O(5) atoms. The Se(1)-O(3) bond length is 1.70 Å. Both Se(1)-O(5) bond lengths are 1.72 Å. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(4) and two equivalent O(6) atoms. The Se(2)-O(4) bond length is 1.71 Å. Both Se(2)-O(6) bond lengths are 1.72 Å. There are ten inequivalent O sites. In the first O site, O(8) is bonded in a distorted water-like geometry to one Cu(1) and two equivalent Cu(3) atoms. In the second O site, O(9) is bonded in a trigonal non-coplanar geometry to one Cu(1), one Cu(2), and one Cu(3) atom. In the third O site, O(10) is bonded in a trigonal non-coplanar geometry to one Cu(1), one Cu(2), and one Cu(3) atom. In the fourth O site, O(1) is bonded in a single-bond geometry to one U(1) atom. In the fifth O site, O(2) is bonded in a single-bond geometry to one U(1) atom. In the sixth O site, O(3) is bonded in a 4-coordinate geometry to one Cu(1), two equivalent Cu(3), and one Se(1) atom. In the seventh O site, O(4) is bonded in a 4-coordinate geometry to one Cu(2), two equivalent Cu(3), and one Se(2) atom. In the eighth O site, O(5) is bonded in a bent 150 degrees geometry to one U(1) and one Se(1) atom. In the ninth O site, O(6) is bonded in a bent 150 degrees geometry to one U(1) and one Se(2) atom. In the tenth O site, O(7) is bonded in a distorted water-like geometry to one Cu(2) and two equivalent Cu(3) atoms.