RbH2PO4 crystallizes in the monoclinic P2_1/m space group. Rb(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), and two equivalent O(3) atoms. P(1) is bonded in a tetrahedral geometry to one O(1), one O(2), and two equivalent O(3) atoms. There are two 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. There are three 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 linear 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(2) atom.
RbH2PO4 crystallizes in the monoclinic P2_1/m space group. Rb(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), and two equivalent O(3) atoms. The Rb(1)-O(1) bond length is 2.93 Å. The Rb(1)-O(2) bond length is 3.00 Å. Both Rb(1)-O(3) bond lengths are 2.97 Å. P(1) is bonded in a tetrahedral geometry to one O(1), one O(2), and two equivalent O(3) atoms. The P(1)-O(1) bond length is 1.59 Å. The P(1)-O(2) bond length is 1.52 Å. Both P(1)-O(3) bond lengths are 1.56 Å. There are two 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 1.02 Å. The H(1)-O(2) bond length is 1.54 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. There are three 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 linear 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(2) atom.