K3UC5O17 crystallizes in the triclinic P-1 space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one O(16), one O(2), one O(4), one O(7), and two equivalent O(17) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(5), one O(6), two equivalent O(10), and two equivalent O(9) atoms. In the third K site, K(3) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(12), one O(15), one O(2), one O(8), and two equivalent O(14) atoms. U(1) is bonded in a distorted pentagonal bipyramidal geometry to one O(1), one O(11), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. There are five inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(5) atom. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(4) and one O(6) atom. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(9) atom. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(10) and one O(8) atom. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(11) and one O(12) atom. There are seventeen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(2) and one U(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one K(1), one K(3), and one U(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one U(1) and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one K(1), one U(1), and one C(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(2) and one C(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(2) and one C(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one K(1), one U(1), and one C(3) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(3), one U(1), and one C(4) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to two equivalent K(2) and one C(3) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one K(3), two equivalent K(2), and one C(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one K(3), one U(1), and one C(5) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one K(2), one K(3), and one C(5) atom. In the thirteenth O site, O(13) is bonded in a single-bond geometry to one O(14) atom. In the fourteenth O site, O(14) is bonded in a distorted T-shaped geometry to two equivalent K(3) and one O(13) atom. In the fifteenth O site, O(15) is bonded in a bent 120 degrees geometry to one K(3) and one O(16) atom. In the sixteenth O site, O(16) is bonded in a water-like geometry to one K(1) and one O(15) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to two equivalent K(1) and one O(17) atom.
K3UC5O17 crystallizes in the triclinic P-1 space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one O(16), one O(2), one O(4), one O(7), and two equivalent O(17) atoms. The K(1)-O(16) bond length is 2.93 Å. The K(1)-O(2) bond length is 2.67 Å. The K(1)-O(4) bond length is 2.60 Å. The K(1)-O(7) bond length is 2.68 Å. There is one shorter (3.04 Å) and one longer (3.12 Å) K(1)-O(17) bond length. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(5), one O(6), two equivalent O(10), and two equivalent O(9) atoms. The K(2)-O(1) bond length is 2.87 Å. The K(2)-O(12) bond length is 2.80 Å. The K(2)-O(5) bond length is 2.84 Å. The K(2)-O(6) bond length is 2.82 Å. There is one shorter (2.95 Å) and one longer (3.19 Å) K(2)-O(10) bond length. There is one shorter (2.98 Å) and one longer (3.17 Å) K(2)-O(9) bond length. In the third K site, K(3) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(12), one O(15), one O(2), one O(8), and two equivalent O(14) atoms. The K(3)-O(10) bond length is 2.66 Å. The K(3)-O(11) bond length is 2.71 Å. The K(3)-O(12) bond length is 2.70 Å. The K(3)-O(15) bond length is 3.10 Å. The K(3)-O(2) bond length is 3.03 Å. The K(3)-O(8) bond length is 3.09 Å. There is one shorter (3.24 Å) and one longer (3.25 Å) K(3)-O(14) bond length. U(1) is bonded in a distorted pentagonal bipyramidal geometry to one O(1), one O(11), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. The U(1)-O(1) bond length is 1.82 Å. The U(1)-O(11) bond length is 2.37 Å. The U(1)-O(2) bond length is 1.85 Å. The U(1)-O(3) bond length is 2.34 Å. The U(1)-O(4) bond length is 2.38 Å. The U(1)-O(7) bond length is 2.41 Å. The U(1)-O(8) bond length is 2.43 Å. There are five inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(5) atom. The C(1)-O(3) bond length is 1.30 Å. The C(1)-O(5) bond length is 1.24 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(4) and one O(6) atom. The C(2)-O(4) bond length is 1.30 Å. The C(2)-O(6) bond length is 1.24 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(9) atom. The C(3)-O(7) bond length is 1.30 Å. The C(3)-O(9) bond length is 1.24 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(10) and one O(8) atom. The C(4)-O(10) bond length is 1.25 Å. The C(4)-O(8) bond length is 1.29 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(11) and one O(12) atom. The C(5)-O(11) bond length is 1.29 Å. The C(5)-O(12) bond length is 1.24 Å. There are seventeen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(2) and one U(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one K(1), one K(3), and one U(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one U(1) and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one K(1), one U(1), and one C(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(2) and one C(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(2) and one C(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one K(1), one U(1), and one C(3) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(3), one U(1), and one C(4) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to two equivalent K(2) and one C(3) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one K(3), two equivalent K(2), and one C(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one K(3), one U(1), and one C(5) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one K(2), one K(3), and one C(5) atom. In the thirteenth O site, O(13) is bonded in a single-bond geometry to one O(14) atom. The O(13)-O(14) bond length is 1.23 Å. In the fourteenth O site, O(14) is bonded in a distorted T-shaped geometry to two equivalent K(3) and one O(13) atom. In the fifteenth O site, O(15) is bonded in a bent 120 degrees geometry to one K(3) and one O(16) atom. The O(15)-O(16) bond length is 1.24 Å. In the sixteenth O site, O(16) is bonded in a water-like geometry to one K(1) and one O(15) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to two equivalent K(1) and one O(17) atom. The O(17)-O(17) bond length is 1.25 Å.