RbC6N3H2O8 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 10-coordinate geometry to one O(1), one O(3), one O(5), one O(8), two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms. The Rb(1)-O(1) bond length is 3.34 Å. The Rb(1)-O(3) bond length is 3.03 Å. The Rb(1)-O(5) bond length is 3.13 Å. The Rb(1)-O(8) bond length is 3.28 Å. There is one shorter (2.97 Å) and one longer (3.19 Å) Rb(1)-O(2) bond length. There is one shorter (2.90 Å) and one longer (3.13 Å) Rb(1)-O(4) bond length. There is one shorter (2.93 Å) and one longer (3.11 Å) Rb(1)-O(6) bond length. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(2), one C(6), and one O(1) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(6) bond length is 1.43 Å. The C(1)-O(1) bond length is 1.32 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 N(1) atom. The C(2)-C(3) bond length is 1.46 Å. The C(2)-N(1) bond length is 1.44 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one O(4) atom. The C(3)-C(4) bond length is 1.47 Å. The C(3)-O(4) bond length is 1.25 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(2) atom. The C(4)-C(5) bond length is 1.37 Å. The C(4)-N(2) bond length is 1.44 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(4), one C(6), and one H(1) atom. The C(5)-C(6) bond length is 1.40 Å. The C(5)-H(1) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(1), one C(5), and one N(3) atom. The C(6)-N(3) bond length is 1.41 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one C(2), one O(2), and one O(3) atom. The N(1)-O(2) bond length is 1.25 Å. The N(1)-O(3) bond length is 1.24 Å. In the second N site, N(2) is bonded in a trigonal planar geometry to one C(4), one O(5), and one O(6) atom. The N(2)-O(5) bond length is 1.24 Å. The N(2)-O(6) bond length is 1.25 Å. In the third N site, N(3) is bonded in a trigonal planar geometry to one C(6), one O(7), and one O(8) atom. The N(3)-O(7) bond length is 1.24 Å. The N(3)-O(8) bond length is 1.28 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(5) atom. In the second H site, H(2) is bonded in a distorted bent 150 degrees geometry to one O(1) and one O(8) atom. The H(2)-O(1) bond length is 1.02 Å. The H(2)-O(8) bond length is 1.59 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one Rb(1), one C(1), and one H(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one N(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Rb(1) and one N(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one C(3) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Rb(1) and one N(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one N(2) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one N(3) atom. In the eighth O site, O(8) is bonded in a water-like geometry to one Rb(1), one N(3), and one H(2) atom. Linkers: 4 O=C1C([N+](=O)[O-])=C[C]([N+](=O)[O-])C(O)=C1[N+](=O)[O-]. Metal clusters: 4 [Rb]. The MOF has largest included sphere 1.60 A, density 2.24 g/cm3, surface area 3120.78 m2/g, accessible volume 0.07 cm3/g