Na2ZnH4(SeO5)2 crystallizes in the triclinic P-1 space group. Na(1) is bonded in a 8-coordinate geometry to one O(4), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Zn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form ZnO6 octahedra that share corners with four equivalent Se(1)O4 tetrahedra. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(4) and one O(5) atom. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(4) and one O(5) atom. Se(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SeO4 tetrahedra that share corners with two equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-58°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Zn(1), and one Se(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to two equivalent Na(1), one Zn(1), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Na(1) and one Se(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one H(1), one H(2), and one Se(1) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Na(1), one Zn(1), one H(1), and one H(2) atom.
Na2ZnH4(SeO5)2 crystallizes in the triclinic P-1 space group. Na(1) is bonded in a 8-coordinate geometry to one O(4), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. The Na(1)-O(4) bond length is 2.36 Å. The Na(1)-O(5) bond length is 2.36 Å. There is one shorter (2.49 Å) and one longer (2.71 Å) Na(1)-O(1) bond length. There is one shorter (2.78 Å) and one longer (2.93 Å) Na(1)-O(2) bond length. There is one shorter (2.47 Å) and one longer (2.48 Å) Na(1)-O(3) bond length. Zn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form ZnO6 octahedra that share corners with four equivalent Se(1)O4 tetrahedra. Both Zn(1)-O(1) bond lengths are 2.17 Å. Both Zn(1)-O(2) bond lengths are 2.12 Å. Both Zn(1)-O(5) bond lengths are 2.01 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(4) and one O(5) atom. The H(1)-O(4) bond length is 1.67 Å. The H(1)-O(5) bond length is 0.99 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(4) and one O(5) atom. The H(2)-O(4) bond length is 1.67 Å. The H(2)-O(5) bond length is 0.99 Å. Se(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SeO4 tetrahedra that share corners with two equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-58°. The Se(1)-O(1) bond length is 1.67 Å. The Se(1)-O(2) bond length is 1.67 Å. The Se(1)-O(3) bond length is 1.63 Å. The Se(1)-O(4) bond length is 1.66 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Zn(1), and one Se(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to two equivalent Na(1), one Zn(1), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Na(1) and one Se(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one H(1), one H(2), and one Se(1) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Na(1), one Zn(1), one H(1), and one H(2) atom.