Cs4UC3O11 crystallizes in the monoclinic C2/c space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms. In the second Cs site, Cs(2) is bonded in a 9-coordinate geometry to one O(4), one O(5), one O(6), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. U(1) is bonded in a distorted hexagonal bipyramidal geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(6) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(4) and two equivalent O(6) atoms. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(1), one O(3), and one O(5) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cs(1), two equivalent Cs(2), one U(1), and one C(2) atom. In the second O site, O(2) is bonded in a single-bond geometry to two equivalent Cs(1), two equivalent Cs(2), and one U(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cs(1), two equivalent Cs(2), one U(1), and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Cs(1), two equivalent Cs(2), and one C(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Cs(2), two equivalent Cs(1), and one C(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Cs(2), two equivalent Cs(1), one U(1), and one C(1) atom.
Cs4UC3O11 crystallizes in the monoclinic C2/c space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms. The Cs(1)-O(1) bond length is 3.45 Å. The Cs(1)-O(3) bond length is 3.21 Å. The Cs(1)-O(4) bond length is 3.18 Å. There is one shorter (3.29 Å) and one longer (3.43 Å) Cs(1)-O(2) bond length. There is one shorter (3.07 Å) and one longer (3.16 Å) Cs(1)-O(5) bond length. There is one shorter (3.27 Å) and one longer (3.31 Å) Cs(1)-O(6) bond length. In the second Cs site, Cs(2) is bonded in a 9-coordinate geometry to one O(4), one O(5), one O(6), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. The Cs(2)-O(4) bond length is 3.27 Å. The Cs(2)-O(5) bond length is 3.15 Å. The Cs(2)-O(6) bond length is 3.37 Å. There is one shorter (3.08 Å) and one longer (3.19 Å) Cs(2)-O(1) bond length. There is one shorter (3.35 Å) and one longer (3.49 Å) Cs(2)-O(2) bond length. There is one shorter (3.12 Å) and one longer (3.43 Å) Cs(2)-O(3) bond length. U(1) is bonded in a distorted hexagonal bipyramidal geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(6) atoms. Both U(1)-O(1) bond lengths are 2.46 Å. Both U(1)-O(2) bond lengths are 1.85 Å. Both U(1)-O(3) bond lengths are 2.45 Å. Both U(1)-O(6) bond lengths are 2.46 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(4) and two equivalent O(6) atoms. The C(1)-O(4) bond length is 1.27 Å. Both C(1)-O(6) bond lengths are 1.32 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(1), one O(3), and one O(5) atom. The C(2)-O(1) bond length is 1.32 Å. The C(2)-O(3) bond length is 1.32 Å. The C(2)-O(5) bond length is 1.26 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cs(1), two equivalent Cs(2), one U(1), and one C(2) atom. In the second O site, O(2) is bonded in a single-bond geometry to two equivalent Cs(1), two equivalent Cs(2), and one U(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cs(1), two equivalent Cs(2), one U(1), and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Cs(1), two equivalent Cs(2), and one C(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Cs(2), two equivalent Cs(1), and one C(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Cs(2), two equivalent Cs(1), one U(1), and one C(1) atom.