Na2FeH8(SO6)2 crystallizes in the monoclinic P2_1/c space group. Na(1) is bonded to one O(3), one O(4), one O(5), one O(6), and two equivalent O(2) atoms to form distorted NaO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with four equivalent S(1)O4 tetrahedra, and  an edgeedge with one Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-67°. Fe(1) is bonded to two equivalent O(1), two equivalent O(5), and two equivalent O(6) atoms to form FeO6 octahedra that share corners with four equivalent Na(1)O6 octahedra and corners with two equivalent S(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-67°. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) and one O(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(4) and one O(5) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(6) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(6) atom. S(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra and corners with four equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-61°. There are six inequivalent O sites. In the first O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one H(1), and one S(1) atom. In the second O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one H(2), and one S(1) atom. In the third O site, O(5) is bonded in a distorted water-like geometry to one Na(1), one Fe(1), one H(1), and one H(2) atom. In the fourth O site, O(6) is bonded in a distorted water-like geometry to one Na(1), one Fe(1), one H(3), and one H(4) atom. In the fifth O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one S(1) atom. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one S(1) atom.
Na2FeH8(SO6)2 crystallizes in the monoclinic P2_1/c space group. Na(1) is bonded to one O(3), one O(4), one O(5), one O(6), and two equivalent O(2) atoms to form distorted NaO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with four equivalent S(1)O4 tetrahedra, and  an edgeedge with one Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-67°. The Na(1)-O(3) bond length is 2.42 Å. The Na(1)-O(4) bond length is 2.48 Å. The Na(1)-O(5) bond length is 2.44 Å. The Na(1)-O(6) bond length is 2.58 Å. There is one shorter (2.39 Å) and one longer (2.51 Å) Na(1)-O(2) bond length. Fe(1) is bonded to two equivalent O(1), two equivalent O(5), and two equivalent O(6) atoms to form FeO6 octahedra that share corners with four equivalent Na(1)O6 octahedra and corners with two equivalent S(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-67°. Both Fe(1)-O(1) bond lengths are 2.09 Å. Both Fe(1)-O(5) bond lengths are 2.16 Å. Both Fe(1)-O(6) bond lengths are 2.22 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) and one O(5) atom. The H(1)-O(3) bond length is 1.72 Å. The H(1)-O(5) bond length is 1.00 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(4) and one O(5) atom. The H(2)-O(4) bond length is 1.74 Å. The H(2)-O(5) bond length is 1.00 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(6) atom. The H(3)-O(6) bond length is 0.99 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(6) atom. The H(4)-O(6) bond length is 0.98 Å. S(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra and corners with four equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-61°. The S(1)-O(1) bond length is 1.50 Å. The S(1)-O(2) bond length is 1.47 Å. The S(1)-O(3) bond length is 1.51 Å. The S(1)-O(4) bond length is 1.51 Å. There are six inequivalent O sites. In the first O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one H(1), and one S(1) atom. In the second O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one H(2), and one S(1) atom. In the third O site, O(5) is bonded in a distorted water-like geometry to one Na(1), one Fe(1), one H(1), and one H(2) atom. In the fourth O site, O(6) is bonded in a distorted water-like geometry to one Na(1), one Fe(1), one H(3), and one H(4) atom. In the fifth O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one S(1) atom. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one S(1) atom.