RbH2PO4 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. P(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are three inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(1) and one O(2) atom. In the second H site, H(2) is bonded in a linear geometry to two equivalent O(3) atoms. In the third H site, H(3) is bonded in a linear geometry to two equivalent O(4) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one P(1), and one H(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to two equivalent 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 two equivalent Rb(1), one P(1), and one H(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to two equivalent Rb(1), one P(1), and one H(3) atom.
RbH2PO4 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. The Rb(1)-O(1) bond length is 3.04 Å. There is one shorter (3.02 Å) and one longer (3.08 Å) Rb(1)-O(2) bond length. There is one shorter (3.03 Å) and one longer (3.10 Å) Rb(1)-O(3) bond length. There is one shorter (3.04 Å) and one longer (3.13 Å) Rb(1)-O(4) bond length. P(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The P(1)-O(1) bond length is 1.59 Å. The P(1)-O(2) bond length is 1.52 Å. The P(1)-O(3) bond length is 1.56 Å. The P(1)-O(4) bond length is 1.56 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(1) and one O(2) atom. The H(1)-O(1) bond length is 1.03 Å. The H(1)-O(2) bond length is 1.50 Å. In the second H site, H(2) is bonded in a linear geometry to two equivalent O(3) atoms. Both H(2)-O(3) bond lengths are 1.21 Å. In the third H site, H(3) is bonded in a linear geometry to two equivalent O(4) atoms. Both H(3)-O(4) bond lengths are 1.22 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one P(1), and one H(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to two equivalent 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 two equivalent Rb(1), one P(1), and one H(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to two equivalent Rb(1), one P(1), and one H(3) atom.