RbH3(CO2)4(CH)4 crystallizes in the triclinic P-1 space group. The structure consists of eight 02329_fluka molecules inside a RbH3(CO2)4 framework. In the RbH3(CO2)4 framework, Rb(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(5), one O(7), one O(8), and two equivalent O(4) atoms. The Rb(1)-O(2) bond length is 3.17 Å. The Rb(1)-O(3) bond length is 3.05 Å. The Rb(1)-O(5) bond length is 3.02 Å. The Rb(1)-O(7) bond length is 3.31 Å. The Rb(1)-O(8) bond length is 2.98 Å. There is one shorter (2.88 Å) and one longer (3.01 Å) Rb(1)-O(4) bond length. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.26 Å. The C(1)-O(2) bond length is 1.30 Å. In the second C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(4)-O(3) bond length is 1.32 Å. The C(4)-O(4) bond length is 1.24 Å. In the third C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. The C(5)-O(5) bond length is 1.28 Å. The C(5)-O(6) bond length is 1.27 Å. In the fourth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. The C(8)-O(7) bond length is 1.33 Å. The C(8)-O(8) bond length is 1.24 Å. There are three inequivalent H sites. In the first H site, H(3) is bonded in a linear geometry to one O(1) and one O(3) atom. The H(3)-O(1) bond length is 1.41 Å. The H(3)-O(3) bond length is 1.06 Å. In the second H site, H(4) is bonded in a linear geometry to one O(2) and one O(5) atom. The H(4)-O(2) bond length is 1.13 Å. The H(4)-O(5) bond length is 1.31 Å. In the third H site, H(7) is bonded in a linear geometry to one O(6) and one O(7) atom. The H(7)-O(6) bond length is 1.40 Å. The H(7)-O(7) bond length is 1.07 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one C(1) and one H(3) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Rb(1), one C(1), and one H(4) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Rb(1), one C(4), and one H(3) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one C(4) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one C(5), and one H(4) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one C(5) and one H(7) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Rb(1), one C(8), and one H(7) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one Rb(1) and one C(8) atom. Linkers: 2 [O]C(=O)/C=C\C(=O)O ,2 O=C(O)/C=C\C(=O)O. Metal clusters: 2 [Rb]. RCSR code: bey. The MOF has largest included sphere 1.79 A, density 1.91 g/cm3, surface area 3827.16 m2/g, accessible volume 0.08 cm3/g