LiAs2H3O7 crystallizes in the monoclinic C2/m space group. Li(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(4) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form corner-sharing AsO4 tetrahedra. The corner-sharing octahedral tilt angles are 61°. In the second As site, As(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form AsO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra and  an edgeedge with one As(2)O6 octahedra. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(4) atom. In the second H site, H(2) is bonded in a linear geometry to one O(3) and one O(5) atom. There are five inequivalent O sites. In the first O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(1), one As(2), and one H(1) atom. In the second O site, O(5) is bonded in a distorted trigonal planar geometry to two equivalent As(2) and one H(2) atom. In the third O site, O(1) is bonded in a distorted T-shaped geometry to two equivalent Li(1) and one As(1) atom. In the fourth O site, O(2) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the fifth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one As(1) and one H(2) atom.
LiAs2H3O7 crystallizes in the monoclinic C2/m space group. Li(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(4) atoms. Both Li(1)-O(1) bond lengths are 1.98 Å. Both Li(1)-O(4) bond lengths are 1.98 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form corner-sharing AsO4 tetrahedra. The corner-sharing octahedral tilt angles are 61°. The As(1)-O(1) bond length is 1.64 Å. The As(1)-O(3) bond length is 1.74 Å. Both As(1)-O(2) bond lengths are 1.73 Å. In the second As site, As(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form AsO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra and  an edgeedge with one As(2)O6 octahedra. Both As(2)-O(2) bond lengths are 1.87 Å. Both As(2)-O(4) bond lengths are 1.78 Å. Both As(2)-O(5) bond lengths are 1.84 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(4) atom. The H(1)-O(4) bond length is 0.98 Å. In the second H site, H(2) is bonded in a linear geometry to one O(3) and one O(5) atom. The H(2)-O(3) bond length is 1.03 Å. The H(2)-O(5) bond length is 1.49 Å. There are five inequivalent O sites. In the first O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(1), one As(2), and one H(1) atom. In the second O site, O(5) is bonded in a distorted trigonal planar geometry to two equivalent As(2) and one H(2) atom. In the third O site, O(1) is bonded in a distorted T-shaped geometry to two equivalent Li(1) and one As(1) atom. In the fourth O site, O(2) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the fifth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one As(1) and one H(2) atom.