Na2Zn2(SO4)3 crystallizes in the monoclinic C2/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. In the second Na site, Na(2) is bonded in a distorted hexagonal planar geometry to two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. Zn(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form ZnO6 octahedra that share corners with two equivalent S(2)O4 tetrahedra and corners with four equivalent S(1)O4 tetrahedra. There are two inequivalent S sites. In the first S site, S(1) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form SO4 tetrahedra that share corners with four equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 29-36°. In the second S site, S(2) is bonded to two equivalent O(2) and two equivalent O(5) atoms to form SO4 tetrahedra that share corners with four equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-36°. There are six inequivalent O sites. In the first O site, O(4) is bonded in a 3-coordinate geometry to one Na(2), one Zn(1), and one S(1) atom. In the second O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Zn(1), and one S(2) atom. In the third O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Zn(1), and one S(1) atom. In the fourth O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Zn(1), and one S(1) atom. In the fifth O site, O(2) is bonded in a bent 150 degrees geometry to one Zn(1) and one S(2) atom. In the sixth O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one Zn(1), and one S(1) atom.
Na2Zn2(SO4)3 crystallizes in the monoclinic C2/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. Both Na(1)-O(1) bond lengths are 2.80 Å. Both Na(1)-O(3) bond lengths are 2.69 Å. Both Na(1)-O(5) bond lengths are 2.42 Å. Both Na(1)-O(6) bond lengths are 2.40 Å. In the second Na site, Na(2) is bonded in a distorted hexagonal planar geometry to two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. Both Na(2)-O(4) bond lengths are 2.60 Å. Both Na(2)-O(5) bond lengths are 2.60 Å. Both Na(2)-O(6) bond lengths are 2.59 Å. Zn(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form ZnO6 octahedra that share corners with two equivalent S(2)O4 tetrahedra and corners with four equivalent S(1)O4 tetrahedra. The Zn(1)-O(1) bond length is 2.04 Å. The Zn(1)-O(2) bond length is 2.00 Å. The Zn(1)-O(3) bond length is 2.13 Å. The Zn(1)-O(4) bond length is 2.12 Å. The Zn(1)-O(5) bond length is 2.16 Å. The Zn(1)-O(6) bond length is 2.18 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form SO4 tetrahedra that share corners with four equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 29-36°. The S(1)-O(1) bond length is 1.49 Å. The S(1)-O(3) bond length is 1.49 Å. The S(1)-O(4) bond length is 1.48 Å. The S(1)-O(6) bond length is 1.51 Å. In the second S site, S(2) is bonded to two equivalent O(2) and two equivalent O(5) atoms to form SO4 tetrahedra that share corners with four equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-36°. Both S(2)-O(2) bond lengths are 1.47 Å. Both S(2)-O(5) bond lengths are 1.51 Å. There are six inequivalent O sites. In the first O site, O(4) is bonded in a 3-coordinate geometry to one Na(2), one Zn(1), and one S(1) atom. In the second O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Zn(1), and one S(2) atom. In the third O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Zn(1), and one S(1) atom. In the fourth O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Zn(1), and one S(1) atom. In the fifth O site, O(2) is bonded in a bent 150 degrees geometry to one Zn(1) and one S(2) atom. In the sixth O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one Zn(1), and one S(1) atom.