Cd2C13N2H8O9 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a distorted octahedral geometry to one N(1), one O(1), one O(3), one O(6), one O(7), and one O(9) atom. The Cd(1)-N(1) bond length is 2.23 Å. The Cd(1)-O(1) bond length is 2.28 Å. The Cd(1)-O(3) bond length is 2.53 Å. The Cd(1)-O(6) bond length is 2.25 Å. The Cd(1)-O(7) bond length is 2.42 Å. The Cd(1)-O(9) bond length is 2.38 Å. In the second Cd site, Cd(2) is bonded in a 6-coordinate geometry to one N(2), one O(1), one O(4), one O(6), one O(7), and one O(8) atom. The Cd(2)-N(2) bond length is 2.29 Å. The Cd(2)-O(1) bond length is 2.46 Å. The Cd(2)-O(4) bond length is 2.33 Å. The Cd(2)-O(6) bond length is 2.43 Å. The Cd(2)-O(7) bond length is 2.31 Å. The Cd(2)-O(8) bond length is 2.40 Å. There are thirteen inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(3), one C(7), and one N(1) atom. The C(1)-C(3) bond length is 1.46 Å. The C(1)-C(7) bond length is 1.40 Å. The C(1)-N(1) bond length is 1.37 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one N(1), one N(2), and one H(1) atom. The C(2)-N(1) bond length is 1.35 Å. The C(2)-N(2) bond length is 1.35 Å. The C(2)-H(1) bond length is 1.09 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(2), and one O(3) atom. The C(3)-O(2) bond length is 1.31 Å. The C(3)-O(3) bond length is 1.26 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(1), and one O(4) atom. The C(4)-C(6) bond length is 1.50 Å. The C(4)-O(1) bond length is 1.29 Å. The C(4)-O(4) bond length is 1.26 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(6) and one H(2) atom. The C(5)-C(6) bond length is 1.40 Å. The C(5)-H(2) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(11), one C(4), and one C(5) atom. The C(6)-C(11) bond length is 1.40 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(1), one C(12), and one N(2) atom. The C(7)-C(12) bond length is 1.46 Å. The C(7)-N(2) bond length is 1.37 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(10), one C(13), and one C(9) atom. The C(8)-C(10) bond length is 1.40 Å. The C(8)-C(13) bond length is 1.49 Å. The C(8)-C(9) bond length is 1.40 Å. In the ninth C site, C(9) is bonded in a distorted single-bond geometry to one C(8) and one H(3,4) atom. The C(9)-H(3,4) bond length is 1.09 Å. In the tenth C site, C(10) is bonded in a distorted single-bond geometry to one C(8) and one H(3,4) atom. The C(10)-H(3,4) bond length is 1.09 Å. In the eleventh C site, C(11) is bonded in a distorted single-bond geometry to one C(6) and one H(5) atom. The C(11)-H(5) bond length is 1.09 Å. In the twelfth C site, C(12) is bonded in a distorted bent 120 degrees geometry to one C(7), one O(5), and one O(6) atom. The C(12)-O(5) bond length is 1.27 Å. The C(12)-O(6) bond length is 1.29 Å. In the thirteenth C site, C(13) is bonded in a distorted bent 120 degrees geometry to one C(8), one O(7), and one O(8) atom. The C(13)-O(7) bond length is 1.29 Å. The C(13)-O(8) bond length is 1.27 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Cd(1), 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 Cd(2), one C(2), and one C(7) atom. There are seven 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(5) atom. In the third H site, H(3,4) is bonded in a single-bond geometry to one C(9) atom. In the fourth H site, H(5) is bonded in a single-bond geometry to one C(11) atom. In the fifth H site, H(6) is bonded in a single-bond geometry to one O(9) atom. The H(6)-O(9) bond length is 0.98 Å. In the sixth H site, H(7) is bonded in a linear geometry to one O(2) and one O(5) atom. The H(7)-O(2) bond length is 1.09 Å. The H(7)-O(5) bond length is 1.38 Å. In the seventh H site, H(8) is bonded in a single-bond geometry to one O(9) atom. The H(8)-O(9) bond length is 0.99 Å. There are nine inequivalent O sites. In the first O site, O(8) is bonded in a distorted single-bond geometry to one Cd(2) and one C(13) atom. In the second O site, O(9) is bonded in a distorted water-like geometry to one Cd(1), one H(6), and one H(8) atom. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to one Cd(1), one Cd(2), and one C(4) atom. In the fourth O site, O(2) is bonded in a water-like geometry to one C(3) and one H(7) atom. In the fifth O site, O(3) is bonded in a distorted single-bond geometry to one Cd(1) and one C(3) atom. In the sixth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Cd(2) and one C(4) atom. In the seventh O site, O(5) is bonded in a water-like geometry to one C(12) and one H(7) atom. In the eighth O site, O(6) is bonded in a distorted trigonal planar geometry to one Cd(1), one Cd(2), and one C(12) atom. In the ninth O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Cd(1), one Cd(2), and one C(13) atom. Linkers: 4 [O]C(=O)c1ccc(C([O])=O)cc1 ,1 [O]C(=O)C1=C(C(=O)O)[N]C=N1 ,3 [O]C(=O)C1=NC=N[C]1C(=O)O. Metal clusters: 8 [Cd]. The MOF has largest included sphere 2.69 A, density 2.48 g/cm3, surface area 2649.28 m2/g, accessible volume 0.10 cm3/g