Si2H2O3 is Indium-like structured and crystallizes in the trigonal R-3 space group. The structure is zero-dimensional and consists of three octasilsesquioxane cage molecules. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one H(1), one O(1), and two equivalent O(2) atoms to form corner-sharing SiHO3 tetrahedra. In the second Si site, Si(2) is bonded to one H(2) and three equivalent O(1) atoms to form corner-sharing SiHO3 tetrahedra. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one Si(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one Si(2) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms.
Si2H2O3 is Indium-like structured and crystallizes in the trigonal R-3 space group. The structure is zero-dimensional and consists of three octasilsesquioxane cage molecules. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one H(1), one O(1), and two equivalent O(2) atoms to form corner-sharing SiHO3 tetrahedra. The Si(1)-H(1) bond length is 1.47 Å. The Si(1)-O(1) bond length is 1.64 Å. Both Si(1)-O(2) bond lengths are 1.64 Å. In the second Si site, Si(2) is bonded to one H(2) and three equivalent O(1) atoms to form corner-sharing SiHO3 tetrahedra. The Si(2)-H(2) bond length is 1.47 Å. All Si(2)-O(1) bond lengths are 1.64 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one Si(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one Si(2) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms.