Ca2ZnAs2(H2O5)2 crystallizes in the triclinic P-1 space group. Ca(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms. Zn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form ZnO6 octahedra that share corners with four equivalent As(1)O4 tetrahedra. As(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form AsO4 tetrahedra that share corners with two equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-60°. There are two inequivalent H sites. In the first H site, H(1) is bonded in a distorted linear geometry to one O(2) and one O(3) atom. In the second H site, H(2) is bonded in a distorted linear geometry to one O(2) and one O(3) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Zn(1), and one As(1) atom. In the second O site, O(2) is bonded in a distorted water-like geometry to one Ca(1), one Zn(1), one H(1), and one H(2) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one As(1), one H(1), and one H(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Ca(1) and one As(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Zn(1), and one As(1) atom.
Ca2ZnAs2(H2O5)2 crystallizes in the triclinic P-1 space group. Ca(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms. The Ca(1)-O(2) bond length is 2.47 Å. The Ca(1)-O(3) bond length is 2.39 Å. There is one shorter (2.64 Å) and one longer (2.77 Å) Ca(1)-O(1) bond length. There is one shorter (2.41 Å) and one longer (2.49 Å) Ca(1)-O(4) bond length. There is one shorter (2.45 Å) and one longer (2.76 Å) Ca(1)-O(5) bond length. Zn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form ZnO6 octahedra that share corners with four equivalent As(1)O4 tetrahedra. Both Zn(1)-O(1) bond lengths are 2.18 Å. Both Zn(1)-O(2) bond lengths are 2.06 Å. Both Zn(1)-O(5) bond lengths are 2.18 Å. As(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form AsO4 tetrahedra that share corners with two equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-60°. The As(1)-O(1) bond length is 1.74 Å. The As(1)-O(3) bond length is 1.73 Å. The As(1)-O(4) bond length is 1.70 Å. The As(1)-O(5) bond length is 1.74 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a distorted linear geometry to one O(2) and one O(3) atom. The H(1)-O(2) bond length is 1.02 Å. The H(1)-O(3) bond length is 1.62 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 1.02 Å. The H(2)-O(3) bond length is 1.56 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Zn(1), and one As(1) atom. In the second O site, O(2) is bonded in a distorted water-like geometry to one Ca(1), one Zn(1), one H(1), and one H(2) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one As(1), one H(1), and one H(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Ca(1) and one As(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Zn(1), and one As(1) atom.