RbC7NH8O6 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 11-coordinate geometry to two equivalent H(8), one O(1), one O(3), one O(4), one O(5), two equivalent O(6), and three equivalent O(2) atoms. There is one shorter (3.05 Å) and one longer (3.07 Å) Rb(1)-H(8) bond length. The Rb(1)-O(1) bond length is 2.95 Å. The Rb(1)-O(3) bond length is 3.41 Å. The Rb(1)-O(4) bond length is 3.48 Å. The Rb(1)-O(5) bond length is 3.13 Å. There is one shorter (3.08 Å) and one longer (3.22 Å) Rb(1)-O(6) bond length. There are a spread of Rb(1)-O(2) bond distances ranging from 2.87-3.05 Å. There are seven inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(6), and one C(7) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(6) bond length is 1.40 Å. The C(1)-C(7) bond length is 1.51 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(1), one C(3), and one H(1) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-H(1) bond length is 1.09 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one C(4), and one H(2) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-H(2) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(3), one C(5), and one N(1) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-N(1) bond length is 1.46 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one C(6), and one H(3) atom. The C(5)-C(6) bond length is 1.39 Å. The C(5)-H(3) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(1), one C(5), and one H(4) atom. The C(6)-H(4) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(3), and one O(4) atom. The C(7)-O(3) bond length is 1.27 Å. The C(7)-O(4) bond length is 1.28 Å. N(1) is bonded in a trigonal planar geometry to one C(4), one O(5), and one O(6) atom. The N(1)-O(5) bond length is 1.24 Å. The N(1)-O(6) bond length is 1.24 Å. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(3) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(5) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(6) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(1) atom. The H(5)-O(1) bond length is 0.99 Å. In the sixth H site, H(6) is bonded in a distorted single-bond geometry to one O(1) and one O(3) atom. The H(6)-O(1) bond length is 1.01 Å. The H(6)-O(3) bond length is 1.65 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(2) atom. The H(7)-O(2) bond length is 0.99 Å. In the eighth H site, H(8) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one O(2) atom. The H(8)-O(2) bond length is 1.00 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Rb(1), one H(5), and one H(6) atom. In the second O site, O(2) is bonded in a water-like geometry to three equivalent Rb(1), one H(7), and one H(8) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one C(7), and one H(6) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Rb(1) and one C(7) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Rb(1) and one N(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one N(1) atom. Linkers: 4 [O]C(=O)c1ccc([N+](=O)[O-])cc1. Metal clusters: 4 [Rb]. RCSR code: fes. The MOF has largest included sphere 1.40 A, density 1.94 g/cm3, surface area 3900.26 m2/g, accessible volume 0.05 cm3/g