K2Cr2Zn(H2O5)2 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(5), two equivalent O(1), and two equivalent O(4) atoms. Cr(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form CrO4 tetrahedra that share corners with two equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-48°. Zn(1) is bonded to two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form ZnO6 octahedra that share corners with four equivalent Cr(1)O4 tetrahedra. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(5) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Cr(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one K(1) and one Cr(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Cr(1), and one Zn(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent K(1), one Cr(1), and one Zn(1) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one K(1), one Zn(1), one H(1), and one H(2) atom.
K2Cr2Zn(H2O5)2 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(5), two equivalent O(1), and two equivalent O(4) atoms. The K(1)-O(2) bond length is 2.96 Å. The K(1)-O(3) bond length is 2.79 Å. The K(1)-O(5) bond length is 2.83 Å. There is one shorter (2.77 Å) and one longer (2.82 Å) K(1)-O(1) bond length. There is one shorter (2.80 Å) and one longer (2.91 Å) K(1)-O(4) bond length. Cr(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form CrO4 tetrahedra that share corners with two equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-48°. The Cr(1)-O(1) bond length is 1.65 Å. The Cr(1)-O(2) bond length is 1.66 Å. The Cr(1)-O(3) bond length is 1.68 Å. The Cr(1)-O(4) bond length is 1.70 Å. Zn(1) is bonded to two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form ZnO6 octahedra that share corners with four equivalent Cr(1)O4 tetrahedra. Both Zn(1)-O(3) bond lengths are 2.15 Å. Both Zn(1)-O(4) bond lengths are 2.09 Å. Both Zn(1)-O(5) bond lengths are 2.14 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. The H(1)-O(5) bond length is 0.99 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 0.99 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Cr(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one K(1) and one Cr(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Cr(1), and one Zn(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent K(1), one Cr(1), and one Zn(1) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one K(1), one Zn(1), one H(1), and one H(2) atom.