Rb2C6NH7O6 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one O(1), one O(5), two equivalent O(4), and three equivalent O(3) atoms. The Rb(1)-O(1) bond length is 2.91 Å. The Rb(1)-O(5) bond length is 2.86 Å. There is one shorter (2.95 Å) and one longer (3.11 Å) Rb(1)-O(4) bond length. There are a spread of Rb(1)-O(3) bond distances ranging from 2.86-3.33 Å. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to one H(2), one O(2), one O(4), one O(6), and two equivalent O(1) atoms. The Rb(2)-H(2) bond length is 3.09 Å. The Rb(2)-O(2) bond length is 2.76 Å. The Rb(2)-O(4) bond length is 2.78 Å. The Rb(2)-O(6) bond length is 2.78 Å. There is one shorter (2.89 Å) and one longer (3.15 Å) Rb(2)-O(1) bond length. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal non-coplanar geometry to one N(1), one H(2), and one H(3) atom. The C(1)-N(1) bond length is 1.50 Å. The C(1)-H(2) bond length is 1.10 Å. The C(1)-H(3) bond length is 1.10 Å. In the second C site, C(2) is bonded in a distorted trigonal non-coplanar geometry to one N(1), one H(4), and one H(5) atom. The C(2)-N(1) bond length is 1.50 Å. The C(2)-H(4) bond length is 1.09 Å. The C(2)-H(5) bond length is 1.10 Å. In the third C site, C(3) is bonded in a distorted trigonal non-coplanar geometry to one N(1), one H(6), and one H(7) atom. The C(3)-N(1) bond length is 1.50 Å. The C(3)-H(6) bond length is 1.09 Å. The C(3)-H(7) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(4)-O(1) bond length is 1.27 Å. The C(4)-O(2) bond length is 1.26 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(5)-O(3) bond length is 1.27 Å. The C(5)-O(4) bond length is 1.27 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. The C(6)-O(5) bond length is 1.26 Å. The C(6)-O(6) bond length is 1.27 Å. N(1) is bonded in a tetrahedral geometry to one C(1), one C(2), one C(3), and one H(1) atom. The N(1)-H(1) bond length is 1.04 Å. There are seven inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one N(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one Rb(2) and one C(1) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(1) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(2) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(2) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(3) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(3) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Rb(1), two equivalent Rb(2), and one C(4) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(2) and one C(4) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to three equivalent Rb(1) and one C(5) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Rb(2), two equivalent Rb(1), and one C(5) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Rb(1) and one C(6) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Rb(2) and one C(6) atom. Linkers: 4 [O]C(=O)C[NH](CC(=O)[O])CC(=O)[O]. Metal clusters: 8 [Rb]. The MOF has largest included sphere 2.92 A, density 2.11 g/cm3, surface area 2986.86 m2/g, accessible volume 0.10 cm3/g