Cs3Np(H3O4)2H2O crystallizes in the monoclinic C2/c space group. The structure consists of four water molecules inside a Cs3Np(H3O4)2 framework. In the Cs3Np(H3O4)2 framework, there are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 2-coordinate geometry to one O(1) and one O(2) atom. In the second Cs site, Cs(2) is bonded in a 12-coordinate geometry to two equivalent H(2), two equivalent H(3), two equivalent O(1), two equivalent O(2), and four equivalent O(4) atoms. Np(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 O(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one Cs(2) and one O(4) atom. In the third H site, H(3) is bonded in a distorted single-bond geometry to one Cs(2) and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cs(1), one Cs(2), and one Np(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Cs(1), one Cs(2), and one Np(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Np(1) and one H(1) atom. In the fourth O site, O(4) is bonded in a water-like geometry to two equivalent Cs(2), one H(2), and one H(3) atom.
Cs3Np(H3O4)2H2O crystallizes in the monoclinic C2/c space group. The structure consists of four water molecules inside a Cs3Np(H3O4)2 framework. In the Cs3Np(H3O4)2 framework, there are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 2-coordinate geometry to one O(1) and one O(2) atom. The Cs(1)-O(1) bond length is 3.10 Å. The Cs(1)-O(2) bond length is 3.20 Å. In the second Cs site, Cs(2) is bonded in a 12-coordinate geometry to two equivalent H(2), two equivalent H(3), two equivalent O(1), two equivalent O(2), and four equivalent O(4) atoms. Both Cs(2)-H(2) bond lengths are 3.32 Å. Both Cs(2)-H(3) bond lengths are 3.26 Å. Both Cs(2)-O(1) bond lengths are 3.48 Å. Both Cs(2)-O(2) bond lengths are 3.25 Å. There are two shorter (3.09 Å) and two longer (3.45 Å) Cs(2)-O(4) bond lengths. Np(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Np(1)-O(1) bond lengths are 1.92 Å. Both Np(1)-O(2) bond lengths are 1.90 Å. Both Np(1)-O(3) bond lengths are 2.43 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) atom. The H(1)-O(3) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one Cs(2) and one O(4) atom. The H(2)-O(4) bond length is 0.98 Å. In the third H site, H(3) is bonded in a distorted single-bond geometry to one Cs(2) and one O(4) atom. The H(3)-O(4) bond length is 1.01 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cs(1), one Cs(2), and one Np(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Cs(1), one Cs(2), and one Np(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Np(1) and one H(1) atom. In the fourth O site, O(4) is bonded in a water-like geometry to two equivalent Cs(2), one H(2), and one H(3) atom.