Zn3As2(H2O3)4 crystallizes in the triclinic P-1 space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms to form ZnO6 octahedra that share corners with two equivalent Zn(2)O4 tetrahedra and corners with two equivalent As(1)O4 tetrahedra. In the second Zn site, Zn(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form ZnO4 tetrahedra that share  a cornercorner with one Zn(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(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share  a cornercorner with one Zn(1)O6 octahedra and corners with four equivalent Zn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 58°. There are four inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one O(4) and one O(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(5) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(6) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Zn(2) and one As(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(2) and one As(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Zn(1), one Zn(2), and one As(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Zn(2), one As(1), and one H(1) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Zn(1), one H(1), and one H(2) atom. In the sixth O site, O(6) is bonded in a distorted water-like geometry to one Zn(1), one H(3), and one H(4) atom.
Zn3As2(H2O3)4 crystallizes in the triclinic P-1 space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms to form ZnO6 octahedra that share corners with two equivalent Zn(2)O4 tetrahedra and corners with two equivalent As(1)O4 tetrahedra. Both Zn(1)-O(3) bond lengths are 2.10 Å. Both Zn(1)-O(5) bond lengths are 2.07 Å. Both Zn(1)-O(6) bond lengths are 2.30 Å. In the second Zn site, Zn(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form ZnO4 tetrahedra that share  a cornercorner with one Zn(1)O6 octahedra and corners with four equivalent As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 58°. The Zn(2)-O(1) bond length is 2.01 Å. The Zn(2)-O(2) bond length is 1.97 Å. The Zn(2)-O(3) bond length is 2.01 Å. The Zn(2)-O(4) bond length is 1.99 Å. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share  a cornercorner with one Zn(1)O6 octahedra and corners with four equivalent Zn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 58°. The As(1)-O(1) bond length is 1.72 Å. The As(1)-O(2) bond length is 1.72 Å. The As(1)-O(3) bond length is 1.75 Å. The As(1)-O(4) bond length is 1.72 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one O(4) and one O(5) atom. The H(1)-O(4) bond length is 1.69 Å. The H(1)-O(5) bond length is 1.00 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(5) atom. The H(2)-O(5) bond length is 1.00 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(6) atom. The H(3)-O(6) bond length is 0.99 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(6) atom. The H(4)-O(6) bond length is 1.00 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Zn(2) and one As(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(2) and one As(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Zn(1), one Zn(2), and one As(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Zn(2), one As(1), and one H(1) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Zn(1), one H(1), and one H(2) atom. In the sixth O site, O(6) is bonded in a distorted water-like geometry to one Zn(1), one H(3), and one H(4) atom.