Rb2CoP4(HO2)8 crystallizes in the triclinic P-1 space group. Rb(1) is bonded in a 10-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one O(6), one O(7), two equivalent O(4), and two equivalent O(8) atoms. Co(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(8) atoms to form CoO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra and corners with two equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 46°. In the second P site, P(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 53°. There are four inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(2) and one O(6) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) atom. In the third H site, H(3) is bonded in a linear geometry to one O(3) and one O(7) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(1) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Rb(1), one Co(1), one H(2), and one H(4) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one P(1), and one H(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one P(1), and one H(3) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Co(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Rb(1), one P(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one P(2), and one H(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one P(2), and one H(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(1), one Co(1), and one P(2) atom.
Rb2CoP4(HO2)8 crystallizes in the triclinic P-1 space group. Rb(1) is bonded in a 10-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one O(6), one O(7), two equivalent O(4), and two equivalent O(8) atoms. The Rb(1)-O(1) bond length is 3.22 Å. The Rb(1)-O(2) bond length is 2.95 Å. The Rb(1)-O(3) bond length is 3.43 Å. The Rb(1)-O(5) bond length is 3.33 Å. The Rb(1)-O(6) bond length is 3.11 Å. The Rb(1)-O(7) bond length is 2.87 Å. There is one shorter (2.92 Å) and one longer (3.08 Å) Rb(1)-O(4) bond length. There is one shorter (3.20 Å) and one longer (3.40 Å) Rb(1)-O(8) bond length. Co(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(8) atoms to form CoO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra and corners with two equivalent P(2)O4 tetrahedra. Both Co(1)-O(1) bond lengths are 2.06 Å. Both Co(1)-O(4) bond lengths are 2.07 Å. Both Co(1)-O(8) bond lengths are 2.11 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 46°. The P(1)-O(2) bond length is 1.56 Å. The P(1)-O(3) bond length is 1.50 Å. The P(1)-O(4) bond length is 1.50 Å. The P(1)-O(5) bond length is 1.60 Å. In the second P site, P(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 53°. The P(2)-O(5) bond length is 1.61 Å. The P(2)-O(6) bond length is 1.51 Å. The P(2)-O(7) bond length is 1.55 Å. The P(2)-O(8) bond length is 1.50 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(2) and one O(6) atom. The H(1)-O(2) bond length is 1.03 Å. The H(1)-O(6) bond length is 1.49 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) atom. The H(2)-O(1) bond length is 0.98 Å. In the third H site, H(3) is bonded in a linear geometry to one O(3) and one O(7) atom. The H(3)-O(3) bond length is 1.45 Å. The H(3)-O(7) bond length is 1.03 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(1) atom. The H(4)-O(1) bond length is 0.98 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Rb(1), one Co(1), one H(2), and one H(4) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one P(1), and one H(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one P(1), and one H(3) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Co(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Rb(1), one P(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one P(2), and one H(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one P(2), and one H(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(1), one Co(1), and one P(2) atom.