CsSi2HO5 crystallizes in the orthorhombic P2_12_12_1 space group. Cs(1) is bonded in a 11-coordinate geometry to two equivalent H(1), one O(1), one O(2), one O(3), three equivalent O(4), and three equivalent O(5) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form corner-sharing SiO4 tetrahedra. H(1) is bonded in a linear geometry to two equivalent Cs(1), one O(4), and one O(5) atom. There are five inequivalent O sites. In the first O site, O(5) is bonded in a distorted bent 120 degrees geometry to three equivalent Cs(1), one Si(2), and one H(1) atom. In the second O site, O(1) is bonded in a bent 150 degrees geometry to one Cs(1), one Si(1), and one Si(2) atom. In the third O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Cs(1), one Si(1), and one Si(2) atom. In the fourth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Cs(1), one Si(1), and one Si(2) atom. In the fifth O site, O(4) is bonded in a distorted bent 120 degrees geometry to three equivalent Cs(1), one Si(1), and one H(1) atom.
CsSi2HO5 crystallizes in the orthorhombic P2_12_12_1 space group. Cs(1) is bonded in a 11-coordinate geometry to two equivalent H(1), one O(1), one O(2), one O(3), three equivalent O(4), and three equivalent O(5) atoms. There is one shorter (3.24 Å) and one longer (3.27 Å) Cs(1)-H(1) bond length. The Cs(1)-O(1) bond length is 3.42 Å. The Cs(1)-O(2) bond length is 3.51 Å. The Cs(1)-O(3) bond length is 3.43 Å. There are a spread of Cs(1)-O(4) bond distances ranging from 3.16-3.52 Å. There are a spread of Cs(1)-O(5) bond distances ranging from 3.13-3.56 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. The Si(1)-O(1) bond length is 1.64 Å. The Si(1)-O(2) bond length is 1.64 Å. The Si(1)-O(3) bond length is 1.64 Å. The Si(1)-O(4) bond length is 1.62 Å. In the second Si site, Si(2) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form corner-sharing SiO4 tetrahedra. The Si(2)-O(1) bond length is 1.65 Å. The Si(2)-O(2) bond length is 1.66 Å. The Si(2)-O(3) bond length is 1.65 Å. The Si(2)-O(5) bond length is 1.59 Å. H(1) is bonded in a linear geometry to two equivalent Cs(1), one O(4), and one O(5) atom. The H(1)-O(4) bond length is 1.09 Å. The H(1)-O(5) bond length is 1.38 Å. There are five inequivalent O sites. In the first O site, O(5) is bonded in a distorted bent 120 degrees geometry to three equivalent Cs(1), one Si(2), and one H(1) atom. In the second O site, O(1) is bonded in a bent 150 degrees geometry to one Cs(1), one Si(1), and one Si(2) atom. In the third O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Cs(1), one Si(1), and one Si(2) atom. In the fourth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Cs(1), one Si(1), and one Si(2) atom. In the fifth O site, O(4) is bonded in a distorted bent 120 degrees geometry to three equivalent Cs(1), one Si(1), and one H(1) atom.