K2UP2(H2O5)2 crystallizes in the monoclinic P2_1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(3), one O(5), two equivalent O(2), two equivalent O(7), and two equivalent O(9) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to one O(1), one O(4), one O(5), one O(9), and two equivalent O(10) atoms. U(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom to form distorted UO7 pentagonal bipyramids that share corners with two equivalent P(2)HO3 tetrahedra and corners with three equivalent P(1)HO3 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one H(1), one O(3), one O(4), and one O(5) atom to form distorted PHO3 tetrahedra that share corners with three equivalent U(1)O7 pentagonal bipyramids. In the second P site, P(2) is bonded to one H(2), one O(6), one O(7), and one O(8) atom to form distorted PHO3 tetrahedra that share corners with two equivalent U(1)O7 pentagonal bipyramids. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one P(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one P(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(9) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(10) atom. There are ten 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 distorted single-bond geometry to two equivalent K(1) and one U(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one K(1), one U(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one K(2), one U(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(1), one K(2), one U(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one U(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to two equivalent K(1) and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one U(1) and one P(2) atom. In the ninth O site, O(9) is bonded in a single-bond geometry to one K(2), two equivalent K(1), and one H(3) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to two equivalent K(2) and one H(4) atom.
K2UP2(H2O5)2 crystallizes in the monoclinic P2_1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(3), one O(5), two equivalent O(2), two equivalent O(7), and two equivalent O(9) atoms. The K(1)-O(3) bond length is 2.98 Å. The K(1)-O(5) bond length is 3.12 Å. There is one shorter (2.95 Å) and one longer (3.19 Å) K(1)-O(2) bond length. There is one shorter (2.76 Å) and one longer (3.01 Å) K(1)-O(7) bond length. There is one shorter (2.95 Å) and one longer (2.98 Å) K(1)-O(9) bond length. In the second K site, K(2) is bonded in a 6-coordinate geometry to one O(1), one O(4), one O(5), one O(9), and two equivalent O(10) atoms. The K(2)-O(1) bond length is 2.90 Å. The K(2)-O(4) bond length is 2.88 Å. The K(2)-O(5) bond length is 2.97 Å. The K(2)-O(9) bond length is 2.77 Å. There is one shorter (2.81 Å) and one longer (2.82 Å) K(2)-O(10) bond length. U(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom to form distorted UO7 pentagonal bipyramids that share corners with two equivalent P(2)HO3 tetrahedra and corners with three equivalent P(1)HO3 tetrahedra. The U(1)-O(1) bond length is 1.83 Å. The U(1)-O(2) bond length is 1.82 Å. The U(1)-O(3) bond length is 2.33 Å. The U(1)-O(4) bond length is 2.41 Å. The U(1)-O(5) bond length is 2.40 Å. The U(1)-O(6) bond length is 2.40 Å. The U(1)-O(8) bond length is 2.32 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one H(1), one O(3), one O(4), and one O(5) atom to form distorted PHO3 tetrahedra that share corners with three equivalent U(1)O7 pentagonal bipyramids. The P(1)-H(1) bond length is 1.41 Å. The P(1)-O(3) bond length is 1.54 Å. The P(1)-O(4) bond length is 1.54 Å. The P(1)-O(5) bond length is 1.54 Å. In the second P site, P(2) is bonded to one H(2), one O(6), one O(7), and one O(8) atom to form distorted PHO3 tetrahedra that share corners with two equivalent U(1)O7 pentagonal bipyramids. The P(2)-H(2) bond length is 1.42 Å. The P(2)-O(6) bond length is 1.55 Å. The P(2)-O(7) bond length is 1.53 Å. The P(2)-O(8) bond length is 1.54 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one P(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one P(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(9) atom. The H(3)-O(9) bond length is 0.99 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(10) atom. The H(4)-O(10) bond length is 0.99 Å. There are ten 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 distorted single-bond geometry to two equivalent K(1) and one U(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one K(1), one U(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one K(2), one U(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(1), one K(2), one U(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one U(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to two equivalent K(1) and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one U(1) and one P(2) atom. In the ninth O site, O(9) is bonded in a single-bond geometry to one K(2), two equivalent K(1), and one H(3) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to two equivalent K(2) and one H(4) atom.