V2H3O5 crystallizes in the monoclinic Cm space group. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(5) atoms to form a mixture of corner and edge-sharing VO6 octahedra. The corner-sharing octahedra are not tilted. In the second V site, V(2) is bonded to one O(1), one O(5), two equivalent O(3), and two equivalent O(4) atoms to form a mixture of distorted corner and edge-sharing VO6 octahedra. The corner-sharing octahedra are not tilted. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(2) and one O(5) atom. In the second H site, H(2) is bonded in a distorted linear geometry to one O(2) and one O(3) atom. In the third H site, H(3) is bonded in a distorted linear geometry to one O(3) and one O(4) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one V(1) and one V(2) atom. In the second O site, O(2) is bonded to two equivalent V(1), one H(1), and one H(2) atom to form distorted OV2H2 tetrahedra that share  a cornercorner with one O(3)V2H2 tetrahedra, corners with two equivalent O(2)V2H2 tetrahedra, corners with three equivalent O(5)V3H tetrahedra, and  an edgeedge with one O(5)V3H tetrahedra. In the third O site, O(3) is bonded to two equivalent V(2), one H(2), and one H(3) atom to form distorted OV2H2 tetrahedra that share  a cornercorner with one O(2)V2H2 tetrahedra, corners with two equivalent O(3)V2H2 tetrahedra, and corners with two equivalent O(5)V3H tetrahedra. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one V(1), two equivalent V(2), and one H(3) atom. In the fifth O site, O(5) is bonded to one V(2), two equivalent V(1), and one H(1) atom to form distorted OV3H tetrahedra that share corners with two equivalent O(3)V2H2 tetrahedra, corners with two equivalent O(5)V3H tetrahedra, corners with three equivalent O(2)V2H2 tetrahedra, and  an edgeedge with one O(2)V2H2 tetrahedra.
V2H3O5 crystallizes in the monoclinic Cm space group. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(5) atoms to form a mixture of corner and edge-sharing VO6 octahedra. The corner-sharing octahedra are not tilted. The V(1)-O(1) bond length is 1.85 Å. The V(1)-O(4) bond length is 2.09 Å. Both V(1)-O(2) bond lengths are 2.06 Å. Both V(1)-O(5) bond lengths are 1.95 Å. In the second V site, V(2) is bonded to one O(1), one O(5), two equivalent O(3), and two equivalent O(4) atoms to form a mixture of distorted corner and edge-sharing VO6 octahedra. The corner-sharing octahedra are not tilted. The V(2)-O(1) bond length is 1.72 Å. The V(2)-O(5) bond length is 2.07 Å. Both V(2)-O(3) bond lengths are 2.01 Å. Both V(2)-O(4) bond lengths are 2.04 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(2) and one O(5) atom. The H(1)-O(2) bond length is 0.99 Å. The H(1)-O(5) bond length is 1.73 Å. In the second H site, H(2) is bonded in a distorted linear geometry to one O(2) and one O(3) atom. The H(2)-O(2) bond length is 1.59 Å. The H(2)-O(3) bond length is 1.01 Å. In the third H site, H(3) is bonded in a distorted linear geometry to one O(3) and one O(4) atom. The H(3)-O(3) bond length is 1.55 Å. The H(3)-O(4) bond length is 1.01 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one V(1) and one V(2) atom. In the second O site, O(2) is bonded to two equivalent V(1), one H(1), and one H(2) atom to form distorted OV2H2 tetrahedra that share  a cornercorner with one O(3)V2H2 tetrahedra, corners with two equivalent O(2)V2H2 tetrahedra, corners with three equivalent O(5)V3H tetrahedra, and  an edgeedge with one O(5)V3H tetrahedra. In the third O site, O(3) is bonded to two equivalent V(2), one H(2), and one H(3) atom to form distorted OV2H2 tetrahedra that share  a cornercorner with one O(2)V2H2 tetrahedra, corners with two equivalent O(3)V2H2 tetrahedra, and corners with two equivalent O(5)V3H tetrahedra. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one V(1), two equivalent V(2), and one H(3) atom. In the fifth O site, O(5) is bonded to one V(2), two equivalent V(1), and one H(1) atom to form distorted OV3H tetrahedra that share corners with two equivalent O(3)V2H2 tetrahedra, corners with two equivalent O(5)V3H tetrahedra, corners with three equivalent O(2)V2H2 tetrahedra, and  an edgeedge with one O(2)V2H2 tetrahedra.