Sr2V3HO9 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 11-coordinate geometry to one O(5), one O(6), two equivalent O(1), three equivalent O(4), and four equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(3), one O(4), one O(6), one O(7), two equivalent O(1), and two equivalent O(2) atoms. There are three inequivalent V sites. In the first V site, V(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form VO6 octahedra that share corners with two equivalent V(2)O4 tetrahedra, corners with two equivalent V(3)O4 tetrahedra, and edges with two equivalent V(1)O6 octahedra. In the second V site, V(2) is bonded to one O(4), one O(6), and two equivalent O(1) atoms to form corner-sharing VO4 tetrahedra. The corner-sharing octahedral tilt angles are 59°. In the third V site, V(3) is bonded to one O(3), one O(7), and two equivalent O(2) atoms to form corner-sharing VO4 tetrahedra. The corner-sharing octahedral tilt angles are 50°. H(1) is bonded in a distorted single-bond geometry to one O(5) and one O(7) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one V(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one V(3) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(2), one V(3), and two equivalent V(1) atoms. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(2), three equivalent Sr(1), and one V(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Sr(1), two equivalent V(1), and one H(1) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(2), and one V(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Sr(2), one V(3), and one H(1) atom.
Sr2V3HO9 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 11-coordinate geometry to one O(5), one O(6), two equivalent O(1), three equivalent O(4), and four equivalent O(2) atoms. The Sr(1)-O(5) bond length is 2.72 Å. The Sr(1)-O(6) bond length is 2.52 Å. Both Sr(1)-O(1) bond lengths are 3.02 Å. There is one shorter (2.90 Å) and two longer (3.20 Å) Sr(1)-O(4) bond lengths. There are two shorter (2.62 Å) and two longer (2.79 Å) Sr(1)-O(2) bond lengths. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(3), one O(4), one O(6), one O(7), two equivalent O(1), and two equivalent O(2) atoms. The Sr(2)-O(3) bond length is 2.97 Å. The Sr(2)-O(4) bond length is 2.63 Å. The Sr(2)-O(6) bond length is 2.91 Å. The Sr(2)-O(7) bond length is 2.66 Å. Both Sr(2)-O(1) bond lengths are 2.59 Å. Both Sr(2)-O(2) bond lengths are 2.61 Å. There are three inequivalent V sites. In the first V site, V(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form VO6 octahedra that share corners with two equivalent V(2)O4 tetrahedra, corners with two equivalent V(3)O4 tetrahedra, and edges with two equivalent V(1)O6 octahedra. Both V(1)-O(1) bond lengths are 2.01 Å. Both V(1)-O(3) bond lengths are 2.09 Å. Both V(1)-O(5) bond lengths are 2.04 Å. In the second V site, V(2) is bonded to one O(4), one O(6), and two equivalent O(1) atoms to form corner-sharing VO4 tetrahedra. The corner-sharing octahedral tilt angles are 59°. The V(2)-O(4) bond length is 1.70 Å. The V(2)-O(6) bond length is 1.70 Å. Both V(2)-O(1) bond lengths are 1.79 Å. In the third V site, V(3) is bonded to one O(3), one O(7), and two equivalent O(2) atoms to form corner-sharing VO4 tetrahedra. The corner-sharing octahedral tilt angles are 50°. The V(3)-O(3) bond length is 1.82 Å. The V(3)-O(7) bond length is 1.71 Å. Both V(3)-O(2) bond lengths are 1.73 Å. H(1) is bonded in a distorted single-bond geometry to one O(5) and one O(7) atom. The H(1)-O(5) bond length is 1.01 Å. The H(1)-O(7) bond length is 1.67 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one V(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one V(3) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(2), one V(3), and two equivalent V(1) atoms. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(2), three equivalent Sr(1), and one V(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Sr(1), two equivalent V(1), and one H(1) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(2), and one V(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Sr(2), one V(3), and one H(1) atom.