CsSrSiHO4 crystallizes in the monoclinic P2_1 space group. Cs(1) is bonded in a 10-coordinate geometry to two equivalent H(1), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Sr(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form SrO6 octahedra that share corners with six equivalent Si(1)O4 tetrahedra and edges with two equivalent Sr(1)O6 octahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with six equivalent Sr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-52°. H(1) is bonded in a distorted single-bond geometry to two equivalent Cs(1) and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Cs(1), two equivalent Sr(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to two equivalent Cs(1), two equivalent Sr(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to two equivalent Cs(1), one Sr(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Cs(1), one Sr(1), one Si(1), and one H(1) atom.
CsSrSiHO4 crystallizes in the monoclinic P2_1 space group. Cs(1) is bonded in a 10-coordinate geometry to two equivalent H(1), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. There is one shorter (2.80 Å) and one longer (2.85 Å) Cs(1)-H(1) bond length. There is one shorter (3.03 Å) and one longer (3.04 Å) Cs(1)-O(1) bond length. There is one shorter (2.88 Å) and one longer (3.17 Å) Cs(1)-O(2) bond length. There is one shorter (2.89 Å) and one longer (3.39 Å) Cs(1)-O(3) bond length. There is one shorter (2.95 Å) and one longer (3.39 Å) Cs(1)-O(4) bond length. Sr(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form SrO6 octahedra that share corners with six equivalent Si(1)O4 tetrahedra and edges with two equivalent Sr(1)O6 octahedra. The Sr(1)-O(3) bond length is 2.49 Å. The Sr(1)-O(4) bond length is 2.74 Å. There is one shorter (2.81 Å) and one longer (2.88 Å) Sr(1)-O(1) bond length. There is one shorter (2.54 Å) and one longer (2.58 Å) Sr(1)-O(2) bond length. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with six equivalent Sr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-52°. The Si(1)-O(1) bond length is 1.64 Å. The Si(1)-O(2) bond length is 1.65 Å. The Si(1)-O(3) bond length is 1.65 Å. The Si(1)-O(4) bond length is 1.74 Å. H(1) is bonded in a distorted single-bond geometry to two equivalent Cs(1) and one O(4) atom. The H(1)-O(4) bond length is 1.02 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Cs(1), two equivalent Sr(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to two equivalent Cs(1), two equivalent Sr(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to two equivalent Cs(1), one Sr(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Cs(1), one Sr(1), one Si(1), and one H(1) atom.