U2Cu(GeO7)2(O2)2 crystallizes in the monoclinic C2/m space group. The structure consists of two tetraoxetane molecules inside a U2Cu(GeO7)2 framework. In the U2Cu(GeO7)2 framework, U(1) is bonded to one O(5), one O(6), one O(7), and four equivalent O(3) atoms to form distorted UO7 pentagonal bipyramids that share corners with three equivalent Ge(1)O4 tetrahedra, edges with two equivalent U(1)O7 pentagonal bipyramids, and  an edgeedge with one Ge(1)O4 tetrahedra. Cu(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(7) atoms. Ge(1) is bonded to one O(4), one O(5), and two equivalent O(3) atoms to form GeO4 tetrahedra that share corners with three equivalent U(1)O7 pentagonal bipyramids and  an edgeedge with one U(1)O7 pentagonal bipyramid. There are six inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Cu(1) atom. In the second O site, O(3) is bonded in a 3-coordinate geometry to two equivalent U(1) and one Ge(1) atom. In the third O site, O(4) is bonded in a single-bond geometry to one Ge(1) atom. In the fourth O site, O(5) is bonded in a bent 150 degrees geometry to one U(1) and one Ge(1) atom. In the fifth O site, O(6) is bonded in a single-bond geometry to one U(1) atom. In the sixth O site, O(7) is bonded in a bent 150 degrees geometry to one U(1) and one Cu(1) atom.
U2Cu(GeO7)2(O2)2 crystallizes in the monoclinic C2/m space group. The structure consists of two tetraoxetane molecules inside a U2Cu(GeO7)2 framework. In the U2Cu(GeO7)2 framework, U(1) is bonded to one O(5), one O(6), one O(7), and four equivalent O(3) atoms to form distorted UO7 pentagonal bipyramids that share corners with three equivalent Ge(1)O4 tetrahedra, edges with two equivalent U(1)O7 pentagonal bipyramids, and  an edgeedge with one Ge(1)O4 tetrahedra. The U(1)-O(5) bond length is 2.18 Å. The U(1)-O(6) bond length is 1.82 Å. The U(1)-O(7) bond length is 1.94 Å. There are two shorter (2.22 Å) and two longer (2.52 Å) U(1)-O(3) bond lengths. Cu(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(7) atoms. Both Cu(1)-O(1) bond lengths are 1.86 Å. Both Cu(1)-O(7) bond lengths are 1.84 Å. Ge(1) is bonded to one O(4), one O(5), and two equivalent O(3) atoms to form GeO4 tetrahedra that share corners with three equivalent U(1)O7 pentagonal bipyramids and  an edgeedge with one U(1)O7 pentagonal bipyramid. The Ge(1)-O(4) bond length is 1.80 Å. The Ge(1)-O(5) bond length is 1.75 Å. Both Ge(1)-O(3) bond lengths are 1.78 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Cu(1) atom. In the second O site, O(3) is bonded in a 3-coordinate geometry to two equivalent U(1) and one Ge(1) atom. In the third O site, O(4) is bonded in a single-bond geometry to one Ge(1) atom. In the fourth O site, O(5) is bonded in a bent 150 degrees geometry to one U(1) and one Ge(1) atom. In the fifth O site, O(6) is bonded in a single-bond geometry to one U(1) atom. In the sixth O site, O(7) is bonded in a bent 150 degrees geometry to one U(1) and one Cu(1) atom.