RbC6N8H5O9 crystallizes in the triclinic P-1 space group. Rb(1) is bonded in a 9-coordinate geometry to one N(5), one O(3), one O(4), one O(5), one O(8), two equivalent O(7), and two equivalent O(9) atoms. The Rb(1)-N(5) bond length is 3.01 Å. The Rb(1)-O(3) bond length is 3.01 Å. The Rb(1)-O(4) bond length is 2.96 Å. The Rb(1)-O(5) bond length is 3.50 Å. The Rb(1)-O(8) bond length is 3.16 Å. There is one shorter (3.36 Å) and one longer (3.39 Å) Rb(1)-O(7) bond length. There is one shorter (2.87 Å) and one longer (3.01 Å) Rb(1)-O(9) bond length. There are six inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one N(1), one N(2), and one N(3) atom. The C(1)-N(1) bond length is 1.33 Å. The C(1)-N(2) bond length is 1.36 Å. The C(1)-N(3) bond length is 1.44 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(3), one N(1), and one N(4) atom. The C(2)-C(3) bond length is 1.41 Å. The C(2)-N(1) bond length is 1.36 Å. The C(2)-N(4) bond length is 1.42 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(2), one N(2), and one H(4) atom. The C(3)-N(2) bond length is 1.35 Å. The C(3)-H(4) bond length is 1.08 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one N(5), one N(6), and one N(7) atom. The C(4)-N(5) bond length is 1.31 Å. The C(4)-N(6) bond length is 1.37 Å. The C(4)-N(7) bond length is 1.44 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(6), one N(6), and one H(5) atom. The C(5)-C(6) bond length is 1.40 Å. The C(5)-N(6) bond length is 1.36 Å. The C(5)-H(5) bond length is 1.08 Å. In the sixth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(5), one N(5), and one N(8) atom. The C(6)-N(5) bond length is 1.35 Å. The C(6)-N(8) bond length is 1.43 Å. There are eight inequivalent N sites. In the first N site, N(1) is bonded in a water-like geometry to one C(1) and one C(2) atom. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one C(1), one C(3), and one H(3) atom. The N(2)-H(3) bond length is 1.66 Å. In the third N site, N(3) is bonded in a trigonal planar geometry to one C(1), one O(1), and one O(2) atom. The N(3)-O(1) bond length is 1.24 Å. The N(3)-O(2) bond length is 1.24 Å. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one C(2), one O(3), and one O(4) atom. The N(4)-O(3) bond length is 1.25 Å. The N(4)-O(4) bond length is 1.25 Å. In the fifth N site, N(5) is bonded in a distorted water-like geometry to one Rb(1), one C(4), and one C(6) atom. In the sixth N site, N(6) is bonded in a trigonal planar geometry to one C(4), one C(5), and one H(3) atom. The N(6)-H(3) bond length is 1.09 Å. In the seventh N site, N(7) is bonded in a trigonal planar geometry to one C(4), one O(5), and one O(6) atom. The N(7)-O(5) bond length is 1.24 Å. The N(7)-O(6) bond length is 1.24 Å. In the eighth N site, N(8) is bonded in a trigonal planar geometry to one C(6), one O(7), and one O(8) atom. The N(8)-O(7) bond length is 1.24 Å. The N(8)-O(8) bond length is 1.25 Å. There are five inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(9) atom. The H(1)-O(9) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(9) atom. The H(2)-O(9) bond length is 0.99 Å. In the third H site, H(3) is bonded in a linear geometry to one N(2) and one N(6) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(3) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(5) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one N(3) atom. In the second O site, O(2) is bonded in a single-bond geometry to one N(3) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Rb(1) and one N(4) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Rb(1) and one N(4) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Rb(1) and one N(7) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one N(7) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to two equivalent Rb(1) and one N(8) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one Rb(1) and one N(8) atom. In the ninth O site, O(9) is bonded in a water-like geometry to two equivalent Rb(1), one H(1), and one H(2) atom. Linkers: 1 O=[N+]([O-])[C]1C=NC([N+](=O)[O-])=N1 ,1 O=[N+]([O-])C1=CN=C([N+](=O)[O-])[N]1 ,2 O ,2 O=[N+]([O-])c1c[nH]c([N+](=O)[O-])n1. Metal clusters: 2 [Rb]. The MOF has largest included sphere 1.46 A, density 2.06 g/cm3, surface area 3781.48 m2/g, accessible volume 0.09 cm3/g