Rb3H(SO4)2 crystallizes in the monoclinic Cc space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 12-coordinate geometry to two equivalent H(1), one O(1), one O(2), one O(3), one O(4), one O(7), one O(8), two equivalent O(5), and two equivalent O(6) atoms. In the second Rb site, Rb(2) is bonded in a 9-coordinate geometry to one O(1), one O(5), one O(7), two equivalent O(2), two equivalent O(4), and two equivalent O(8) atoms. In the third Rb site, Rb(3) is bonded in a 9-coordinate geometry to one O(2), one O(6), one O(8), two equivalent O(1), two equivalent O(3), and two equivalent O(7) atoms. H(1) is bonded in a linear geometry to two equivalent Rb(1), one O(5), and one O(6) atom. There are two inequivalent S sites. In the first S site, S(1) is bonded in a tetrahedral geometry to one O(1), one O(3), one O(5), and one O(7) atom. In the second S site, S(2) is bonded in a tetrahedral geometry to one O(2), one O(4), one O(6), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(5) is bonded in a distorted water-like geometry to one Rb(2), two equivalent Rb(1), one H(1), and one S(1) atom. In the second O site, O(6) is bonded in a distorted water-like geometry to one Rb(3), two equivalent Rb(1), one H(1), and one S(2) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), two equivalent Rb(3), and one S(1) atom. In the fourth O site, O(8) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(3), two equivalent Rb(2), and one S(2) atom. In the fifth O site, O(1) is bonded in a single-bond geometry to one Rb(1), one Rb(2), two equivalent Rb(3), and one S(1) atom. In the sixth O site, O(2) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(3), two equivalent Rb(2), and one S(2) atom. In the seventh O site, O(3) is bonded in a distorted single-bond geometry to one Rb(1), two equivalent Rb(3), and one S(1) atom. In the eighth O site, O(4) is bonded in a distorted single-bond geometry to one Rb(1), two equivalent Rb(2), and one S(2) atom.
Rb3H(SO4)2 crystallizes in the monoclinic Cc space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 12-coordinate geometry to two equivalent H(1), one O(1), one O(2), one O(3), one O(4), one O(7), one O(8), two equivalent O(5), and two equivalent O(6) atoms. Both Rb(1)-H(1) bond lengths are 3.02 Å. The Rb(1)-O(1) bond length is 3.07 Å. The Rb(1)-O(2) bond length is 2.97 Å. The Rb(1)-O(3) bond length is 2.94 Å. The Rb(1)-O(4) bond length is 2.86 Å. The Rb(1)-O(7) bond length is 3.11 Å. The Rb(1)-O(8) bond length is 3.03 Å. There is one shorter (3.28 Å) and one longer (3.30 Å) Rb(1)-O(5) bond length. There is one shorter (3.21 Å) and one longer (3.25 Å) Rb(1)-O(6) bond length. In the second Rb site, Rb(2) is bonded in a 9-coordinate geometry to one O(1), one O(5), one O(7), two equivalent O(2), two equivalent O(4), and two equivalent O(8) atoms. The Rb(2)-O(1) bond length is 3.11 Å. The Rb(2)-O(5) bond length is 3.15 Å. The Rb(2)-O(7) bond length is 3.04 Å. There is one shorter (3.03 Å) and one longer (3.10 Å) Rb(2)-O(2) bond length. There is one shorter (3.05 Å) and one longer (3.16 Å) Rb(2)-O(4) bond length. There is one shorter (3.08 Å) and one longer (3.17 Å) Rb(2)-O(8) bond length. In the third Rb site, Rb(3) is bonded in a 9-coordinate geometry to one O(2), one O(6), one O(8), two equivalent O(1), two equivalent O(3), and two equivalent O(7) atoms. The Rb(3)-O(2) bond length is 3.07 Å. The Rb(3)-O(6) bond length is 3.23 Å. The Rb(3)-O(8) bond length is 2.99 Å. There is one shorter (3.04 Å) and one longer (3.10 Å) Rb(3)-O(1) bond length. There is one shorter (3.07 Å) and one longer (3.15 Å) Rb(3)-O(3) bond length. There is one shorter (3.08 Å) and one longer (3.17 Å) Rb(3)-O(7) bond length. H(1) is bonded in a linear geometry to two equivalent Rb(1), one O(5), and one O(6) atom. The H(1)-O(5) bond length is 1.07 Å. The H(1)-O(6) bond length is 1.44 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded in a tetrahedral geometry to one O(1), one O(3), one O(5), and one O(7) atom. The S(1)-O(1) bond length is 1.47 Å. The S(1)-O(3) bond length is 1.47 Å. The S(1)-O(5) bond length is 1.60 Å. The S(1)-O(7) bond length is 1.47 Å. In the second S site, S(2) is bonded in a tetrahedral geometry to one O(2), one O(4), one O(6), and one O(8) atom. The S(2)-O(2) bond length is 1.49 Å. The S(2)-O(4) bond length is 1.48 Å. The S(2)-O(6) bond length is 1.53 Å. The S(2)-O(8) bond length is 1.49 Å. There are eight inequivalent O sites. In the first O site, O(5) is bonded in a distorted water-like geometry to one Rb(2), two equivalent Rb(1), one H(1), and one S(1) atom. In the second O site, O(6) is bonded in a distorted water-like geometry to one Rb(3), two equivalent Rb(1), one H(1), and one S(2) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), two equivalent Rb(3), and one S(1) atom. In the fourth O site, O(8) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(3), two equivalent Rb(2), and one S(2) atom. In the fifth O site, O(1) is bonded in a single-bond geometry to one Rb(1), one Rb(2), two equivalent Rb(3), and one S(1) atom. In the sixth O site, O(2) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(3), two equivalent Rb(2), and one S(2) atom. In the seventh O site, O(3) is bonded in a distorted single-bond geometry to one Rb(1), two equivalent Rb(3), and one S(1) atom. In the eighth O site, O(4) is bonded in a distorted single-bond geometry to one Rb(1), two equivalent Rb(2), and one S(2) atom.