Rb2(HSO4)(H2PO4) crystallizes in the triclinic P-1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 4-coordinate geometry to one O(2), one O(3), one O(4), and one O(7) atom. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to one O(2), one O(5), one O(8), two equivalent O(6), and two equivalent O(7) atoms. P(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(4) atom. There are four inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to two equivalent O(1) atoms. In the second H site, H(2) is bonded in a single-bond geometry to one O(3) 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 linear geometry to two equivalent O(8) atoms. S(1) is bonded in a trigonal non-coplanar geometry to one O(5), one O(7), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one H(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), and one P(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to one Rb(1) and one H(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Rb(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Rb(2) and one S(1) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to two equivalent Rb(2) and one H(3) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Rb(1), two equivalent Rb(2), and one S(1) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Rb(2), one H(4), and one S(1) atom.
Rb2(HSO4)(H2PO4) crystallizes in the triclinic P-1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 4-coordinate geometry to one O(2), one O(3), one O(4), and one O(7) atom. The Rb(1)-O(2) bond length is 2.93 Å. The Rb(1)-O(3) bond length is 2.79 Å. The Rb(1)-O(4) bond length is 2.90 Å. The Rb(1)-O(7) bond length is 3.16 Å. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to one O(2), one O(5), one O(8), two equivalent O(6), and two equivalent O(7) atoms. The Rb(2)-O(2) bond length is 3.44 Å. The Rb(2)-O(5) bond length is 2.89 Å. The Rb(2)-O(8) bond length is 3.42 Å. There is one shorter (2.85 Å) and one longer (2.98 Å) Rb(2)-O(6) bond length. There is one shorter (3.13 Å) and one longer (3.33 Å) Rb(2)-O(7) bond length. P(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(4) atom. The P(1)-O(1) bond length is 1.53 Å. The P(1)-O(2) bond length is 1.48 Å. The P(1)-O(4) bond length is 1.48 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to two equivalent O(1) atoms. Both H(1)-O(1) bond lengths are 1.20 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(3) atom. The H(2)-O(3) bond length is 0.98 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 0.98 Å. In the fourth H site, H(4) is bonded in a linear geometry to two equivalent O(8) atoms. Both H(4)-O(8) bond lengths are 1.22 Å. S(1) is bonded in a trigonal non-coplanar geometry to one O(5), one O(7), and one O(8) atom. The S(1)-O(5) bond length is 1.54 Å. The S(1)-O(7) bond length is 1.55 Å. The S(1)-O(8) bond length is 1.58 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one H(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), and one P(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to one Rb(1) and one H(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Rb(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Rb(2) and one S(1) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to two equivalent Rb(2) and one H(3) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Rb(1), two equivalent Rb(2), and one S(1) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Rb(2), one H(4), and one S(1) atom.