K2Cr4Co(HO4)4 crystallizes in the triclinic P-1 space group. K(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), two equivalent O(7), and two equivalent O(8) atoms. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(3), one O(4), one O(5), and one O(8) atom to form CrO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra and  a cornercorner with one Cr(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. In the second Cr site, Cr(2) is bonded to one O(1), one O(2), one O(3), and one O(7) atom to form CrO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra and  a cornercorner with one Cr(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 4°. Co(1) is bonded to two equivalent O(1), two equivalent O(5), and two equivalent O(6) atoms to form CoO6 octahedra that share corners with two equivalent Cr(1)O4 tetrahedra and corners with two equivalent Cr(2)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(6) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(6) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Cr(2) and one Co(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1) and one Cr(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(1), one Cr(1), and one Cr(2) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one K(1) and one Cr(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one Cr(1), and one Co(1) atom. In the sixth O site, O(6) is bonded in a distorted water-like geometry to one K(1), one Co(1), one H(1), and one H(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Cr(2) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Cr(1) atom.
K2Cr4Co(HO4)4 crystallizes in the triclinic P-1 space group. K(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), two equivalent O(7), and two equivalent O(8) atoms. The K(1)-O(2) bond length is 2.89 Å. The K(1)-O(3) bond length is 3.00 Å. The K(1)-O(4) bond length is 2.98 Å. The K(1)-O(5) bond length is 3.12 Å. The K(1)-O(6) bond length is 3.12 Å. There is one shorter (2.89 Å) and one longer (3.07 Å) K(1)-O(7) bond length. There is one shorter (2.88 Å) and one longer (3.10 Å) K(1)-O(8) bond length. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(3), one O(4), one O(5), and one O(8) atom to form CrO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra and  a cornercorner with one Cr(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. The Cr(1)-O(3) bond length is 1.80 Å. The Cr(1)-O(4) bond length is 1.62 Å. The Cr(1)-O(5) bond length is 1.66 Å. The Cr(1)-O(8) bond length is 1.63 Å. In the second Cr site, Cr(2) is bonded to one O(1), one O(2), one O(3), and one O(7) atom to form CrO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra and  a cornercorner with one Cr(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 4°. The Cr(2)-O(1) bond length is 1.65 Å. The Cr(2)-O(2) bond length is 1.64 Å. The Cr(2)-O(3) bond length is 1.80 Å. The Cr(2)-O(7) bond length is 1.62 Å. Co(1) is bonded to two equivalent O(1), two equivalent O(5), and two equivalent O(6) atoms to form CoO6 octahedra that share corners with two equivalent Cr(1)O4 tetrahedra and corners with two equivalent Cr(2)O4 tetrahedra. Both Co(1)-O(1) bond lengths are 2.04 Å. Both Co(1)-O(5) bond lengths are 2.07 Å. Both Co(1)-O(6) bond lengths are 2.15 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(6) atom. The H(1)-O(6) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(6) atom. The H(2)-O(6) bond length is 1.00 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Cr(2) and one Co(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1) and one Cr(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(1), one Cr(1), and one Cr(2) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one K(1) and one Cr(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one Cr(1), and one Co(1) atom. In the sixth O site, O(6) is bonded in a distorted water-like geometry to one K(1), one Co(1), one H(1), and one H(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Cr(2) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Cr(1) atom.