MnAsH2O5 crystallizes in the triclinic P-1 space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra and corners with four equivalent As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 58°. In the second Mn site, Mn(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra and corners with four equivalent As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 58°. As(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form AsO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra and corners with two equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-54°. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) and one O(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) and one O(5) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one Mn(1), one Mn(2), one H(1), and one H(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one As(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Mn(2) and one As(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mn(2), one As(1), and one H(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mn(1), one As(1), and one H(2) atom.
MnAsH2O5 crystallizes in the triclinic P-1 space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra and corners with four equivalent As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 58°. Both Mn(1)-O(1) bond lengths are 2.36 Å. Both Mn(1)-O(2) bond lengths are 1.93 Å. Both Mn(1)-O(5) bond lengths are 1.96 Å. In the second Mn site, Mn(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra and corners with four equivalent As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 58°. Both Mn(2)-O(1) bond lengths are 2.36 Å. Both Mn(2)-O(3) bond lengths are 1.93 Å. Both Mn(2)-O(4) bond lengths are 1.96 Å. As(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form AsO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra and corners with two equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-54°. The As(1)-O(2) bond length is 1.71 Å. The As(1)-O(3) bond length is 1.71 Å. The As(1)-O(4) bond length is 1.73 Å. The As(1)-O(5) bond length is 1.73 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) and one O(4) atom. The H(1)-O(1) bond length is 1.00 Å. The H(1)-O(4) bond length is 1.70 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) and one O(5) atom. The H(2)-O(1) bond length is 1.00 Å. The H(2)-O(5) bond length is 1.70 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one Mn(1), one Mn(2), one H(1), and one H(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one As(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Mn(2) and one As(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mn(2), one As(1), and one H(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mn(1), one As(1), and one H(2) atom.