K3Pu(H3O4)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent H(2), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to one H(1), one H(2), one H(3), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Pu(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one K(2) and one O(1) atom. In the second H site, H(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one O(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one K(2) and one O(4) atom. There are four inequivalent O sites. In the first O site, O(4) is bonded in a water-like geometry to two equivalent K(2), one H(2), and one H(3) atom. In the second O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one Pu(1), and one H(1) atom. In the third O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one K(1), two equivalent K(2), and one Pu(1) atom. In the fourth O site, O(3) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one Pu(1) atom.
K3Pu(H3O4)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent H(2), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both K(1)-H(2) bond lengths are 2.68 Å. Both K(1)-O(1) bond lengths are 2.83 Å. Both K(1)-O(2) bond lengths are 2.69 Å. Both K(1)-O(3) bond lengths are 2.76 Å. In the second K site, K(2) is bonded in a 9-coordinate geometry to one H(1), one H(2), one H(3), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. The K(2)-H(1) bond length is 2.79 Å. The K(2)-H(2) bond length is 2.82 Å. The K(2)-H(3) bond length is 2.75 Å. There is one shorter (2.73 Å) and one longer (2.80 Å) K(2)-O(2) bond length. There is one shorter (2.78 Å) and one longer (3.04 Å) K(2)-O(3) bond length. There is one shorter (2.76 Å) and one longer (2.87 Å) K(2)-O(4) bond length. Pu(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Pu(1)-O(1) bond lengths are 2.36 Å. Both Pu(1)-O(2) bond lengths are 1.86 Å. Both Pu(1)-O(3) bond lengths are 1.90 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one K(2) and one O(1) atom. The H(1)-O(1) bond length is 0.98 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one O(4) atom. The H(2)-O(4) bond length is 1.00 Å. In the third H site, H(3) is bonded in a single-bond geometry to one K(2) and one O(4) atom. The H(3)-O(4) bond length is 0.99 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a water-like geometry to two equivalent K(2), one H(2), and one H(3) atom. In the second O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one Pu(1), and one H(1) atom. In the third O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one K(1), two equivalent K(2), and one Pu(1) atom. In the fourth O site, O(3) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one Pu(1) atom.