Na3SiH3O5 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one H(2), one O(1), one O(2), one O(3), one O(4), and one O(5) atom. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one H(1), one O(1), one O(2), one O(3), and one O(4) atom. In the third Na site, Na(3) is bonded in a 5-coordinate geometry to one O(5), two equivalent O(2), and two equivalent O(3) atoms. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are three inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one Na(2), one O(1), and one O(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one Na(1), one O(3), and one O(5) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(4) and one O(5) atom. There are five inequivalent O sites. In the first O site, O(2) is bonded to one Na(1), one Na(2), two equivalent Na(3), and one Si(1) atom to form distorted edge-sharing ONa4Si trigonal bipyramids. In the second O site, O(3) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), two equivalent Na(3), one Si(1), and one H(2) atom. In the third O site, O(4) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Si(1), one H(1), and one H(3) atom. In the fourth O site, O(5) is bonded in a distorted water-like geometry to one Na(1), one Na(3), one H(2), and one H(3) atom. In the fifth O site, O(1) is bonded in a 1-coordinate geometry to one Na(1), one Na(2), one Si(1), and one H(1) atom.
Na3SiH3O5 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one H(2), one O(1), one O(2), one O(3), one O(4), and one O(5) atom. The Na(1)-H(2) bond length is 2.37 Å. The Na(1)-O(1) bond length is 2.43 Å. The Na(1)-O(2) bond length is 2.32 Å. The Na(1)-O(3) bond length is 2.47 Å. The Na(1)-O(4) bond length is 2.51 Å. The Na(1)-O(5) bond length is 2.46 Å. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one H(1), one O(1), one O(2), one O(3), and one O(4) atom. The Na(2)-H(1) bond length is 2.31 Å. The Na(2)-O(1) bond length is 2.39 Å. The Na(2)-O(2) bond length is 2.32 Å. The Na(2)-O(3) bond length is 2.43 Å. The Na(2)-O(4) bond length is 2.36 Å. In the third Na site, Na(3) is bonded in a 5-coordinate geometry to one O(5), two equivalent O(2), and two equivalent O(3) atoms. The Na(3)-O(5) bond length is 2.43 Å. There is one shorter (2.33 Å) and one longer (2.44 Å) Na(3)-O(2) bond length. There is one shorter (2.34 Å) and one longer (2.48 Å) Na(3)-O(3) bond length. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Si(1)-O(1) bond length is 1.72 Å. The Si(1)-O(2) bond length is 1.63 Å. The Si(1)-O(3) bond length is 1.65 Å. The Si(1)-O(4) bond length is 1.65 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one Na(2), one O(1), and one O(4) atom. The H(1)-O(1) bond length is 1.03 Å. The H(1)-O(4) bond length is 1.59 Å. In the second H site, H(2) is bonded in a single-bond geometry to one Na(1), one O(3), and one O(5) atom. The H(2)-O(3) bond length is 1.76 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(4) and one O(5) atom. The H(3)-O(4) bond length is 1.71 Å. The H(3)-O(5) bond length is 1.01 Å. There are five inequivalent O sites. In the first O site, O(2) is bonded to one Na(1), one Na(2), two equivalent Na(3), and one Si(1) atom to form distorted edge-sharing ONa4Si trigonal bipyramids. In the second O site, O(3) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), two equivalent Na(3), one Si(1), and one H(2) atom. In the third O site, O(4) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Si(1), one H(1), and one H(3) atom. In the fourth O site, O(5) is bonded in a distorted water-like geometry to one Na(1), one Na(3), one H(2), and one H(3) atom. In the fifth O site, O(1) is bonded in a 1-coordinate geometry to one Na(1), one Na(2), one Si(1), and one H(1) atom.