Na2Zn(OH)4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one H(1), one O(1), one O(3), one O(4), and two equivalent O(2) atoms. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one H(4), one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms. Zn(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one Na(1) and one O(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(3) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one Na(2) and one O(4) atom. There are four inequivalent O sites. In the first O site, O(2) is bonded in a distorted single-bond geometry to one Na(2), two equivalent Na(1), one Zn(1), and one H(2) atom. In the second O site, O(3) is bonded in a distorted single-bond geometry to one Na(1), two equivalent Na(2), one Zn(1), and one H(3) atom. In the third O site, O(4) is bonded in a distorted single-bond geometry to one Na(1), two equivalent Na(2), one Zn(1), and one H(4) atom. In the fourth O site, O(1) is bonded in a distorted single-bond geometry to one Na(1), one Na(2), one Zn(1), and one H(1) atom.
Na2Zn(OH)4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one H(1), one O(1), one O(3), one O(4), and two equivalent O(2) atoms. The Na(1)-H(1) bond length is 2.41 Å. The Na(1)-O(1) bond length is 2.30 Å. The Na(1)-O(3) bond length is 2.35 Å. The Na(1)-O(4) bond length is 2.47 Å. There is one shorter (2.38 Å) and one longer (2.41 Å) Na(1)-O(2) bond length. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one H(4), one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms. The Na(2)-H(4) bond length is 2.42 Å. The Na(2)-O(1) bond length is 2.39 Å. The Na(2)-O(2) bond length is 2.55 Å. There is one shorter (2.56 Å) and one longer (2.65 Å) Na(2)-O(3) bond length. There is one shorter (2.31 Å) and one longer (2.51 Å) Na(2)-O(4) bond length. Zn(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Zn(1)-O(1) bond length is 1.96 Å. The Zn(1)-O(2) bond length is 2.05 Å. The Zn(1)-O(3) bond length is 2.01 Å. The Zn(1)-O(4) bond length is 2.02 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one Na(1) 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 single-bond geometry to one O(2) atom. The H(2)-O(2) bond length is 0.97 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(3) atom. The H(3)-O(3) bond length is 0.97 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one Na(2) and one O(4) atom. The H(4)-O(4) bond length is 0.97 Å. There are four inequivalent O sites. In the first O site, O(2) is bonded in a distorted single-bond geometry to one Na(2), two equivalent Na(1), one Zn(1), and one H(2) atom. In the second O site, O(3) is bonded in a distorted single-bond geometry to one Na(1), two equivalent Na(2), one Zn(1), and one H(3) atom. In the third O site, O(4) is bonded in a distorted single-bond geometry to one Na(1), two equivalent Na(2), one Zn(1), and one H(4) atom. In the fourth O site, O(1) is bonded in a distorted single-bond geometry to one Na(1), one Na(2), one Zn(1), and one H(1) atom.