Cd2C19N7H9O6 crystallizes in the monoclinic C2/c space group. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a 6-coordinate geometry to one N(1), one N(6), one O(1), one O(2), one O(3), and one O(6) atom. The Cd(1)-N(1) bond length is 2.37 Å. The Cd(1)-N(6) bond length is 2.36 Å. The Cd(1)-O(1) bond length is 2.23 Å. The Cd(1)-O(2) bond length is 2.31 Å. The Cd(1)-O(3) bond length is 2.44 Å. The Cd(1)-O(6) bond length is 2.33 Å. In the second Cd site, Cd(2) is bonded in a 6-coordinate geometry to one N(2), one N(3), one N(5), one N(7), one O(4), and one O(5) atom. The Cd(2)-N(2) bond length is 2.52 Å. The Cd(2)-N(3) bond length is 2.34 Å. The Cd(2)-N(5) bond length is 2.35 Å. The Cd(2)-N(7) bond length is 2.50 Å. The Cd(2)-O(4) bond length is 2.67 Å. The Cd(2)-O(5) bond length is 2.23 Å. There are nineteen inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(4), one N(1), and one H(1) atom. The C(1)-C(4) bond length is 1.39 Å. The C(1)-N(1) bond length is 1.33 Å. The C(1)-H(1) bond length is 0.93 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one N(2) and one H(2) atom. The C(2)-N(2) bond length is 1.33 Å. The C(2)-H(2) bond length is 0.93 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one N(1) and one H(3) atom. The C(3)-N(1) bond length is 1.36 Å. The C(3)-H(3) bond length is 0.93 Å. In the fourth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(1), one C(5), and one N(2) atom. The C(4)-C(5) bond length is 1.44 Å. The C(4)-N(2) bond length is 1.35 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one N(3), and one N(4) atom. The C(5)-N(3) bond length is 1.33 Å. The C(5)-N(4) bond length is 1.35 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(16), one C(8), and one H(4) atom. The C(6)-C(16) bond length is 1.38 Å. The C(6)-C(8) bond length is 1.41 Å. The C(6)-H(4) bond length is 0.93 Å. In the seventh C site, C(7) is bonded in a bent 120 degrees geometry to one C(8), one O(1), and one O(2) atom. The C(7)-C(8) bond length is 1.52 Å. The C(7)-O(1) bond length is 1.25 Å. The C(7)-O(2) bond length is 1.23 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(14), one C(6), and one C(7) atom. The C(8)-C(14) bond length is 1.39 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one N(6) and one H(5) atom. The C(9)-N(6) bond length is 1.31 Å. The C(9)-H(5) bond length is 0.93 Å. In the tenth C site, C(10) is bonded in a distorted single-bond geometry to one C(11) and one N(7) atom. The C(10)-C(11) bond length is 1.47 Å. The C(10)-N(7) bond length is 1.33 Å. In the eleventh C site, C(11) is bonded in a distorted trigonal planar geometry to one C(10), one N(4), and one N(5) atom. The C(11)-N(4) bond length is 1.35 Å. The C(11)-N(5) bond length is 1.34 Å. In the twelfth C site, C(12) is bonded in a bent 120 degrees geometry to one C(16), one O(4), and one O(5) atom. The C(12)-C(16) bond length is 1.51 Å. The C(12)-O(4) bond length is 1.26 Å. The C(12)-O(5) bond length is 1.26 Å. In the thirteenth C site, C(13) is bonded in a trigonal planar geometry to one C(14), one C(15), and one C(19) atom. The C(13)-C(14) bond length is 1.40 Å. The C(13)-C(15) bond length is 1.40 Å. The C(13)-C(19) bond length is 1.51 Å. In the fourteenth C site, C(14) is bonded in a single-bond geometry to one C(13), one C(8), and one H(6) atom. The C(14)-H(6) bond length is 0.93 Å. In the fifteenth C site, C(15) is bonded in a distorted single-bond geometry to one C(13), one C(16), and one H(7) atom. The C(15)-C(16) bond length is 1.39 Å. The C(15)-H(7) bond length is 0.93 Å. In the sixteenth C site, C(16) is bonded in a trigonal planar geometry to one C(12), one C(15), and one C(6) atom. In the seventeenth C site, C(17) is bonded in a distorted bent 120 degrees geometry to one N(6) and one H(8) atom. The C(17)-N(6) bond length is 1.35 Å. The C(17)-H(8) bond length is 0.93 Å. In the eighteenth C site, C(18) is bonded in a distorted bent 120 degrees geometry to one N(7) and one H(9) atom. The C(18)-N(7) bond length is 1.34 Å. The C(18)-H(9) bond length is 0.93 Å. In the nineteenth C site, C(19) is bonded in a distorted bent 120 degrees geometry to one C(13), one O(3), and one O(6) atom. The C(19)-O(3) bond length is 1.24 Å. The C(19)-O(6) bond length is 1.28 Å. There are seven 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(3) 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(4) atom. In the third N site, N(3) is bonded in a 3-coordinate geometry to one Cd(2), one C(5), and one N(5) atom. The N(3)-N(5) bond length is 1.36 Å. In the fourth N site, N(4) is bonded in a water-like geometry to one C(11) and one C(5) atom. In the fifth N site, N(5) is bonded in a 3-coordinate geometry to one Cd(2), one C(11), and one N(3) atom. In the sixth N site, N(6) is bonded in a trigonal planar geometry to one Cd(1), one C(17), and one C(9) atom. In the seventh N site, N(7) is bonded in a distorted trigonal planar geometry to one Cd(2), one C(10), and one C(18) atom. There are nine inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(3) 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 C(9) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(14) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(15) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(17) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(18) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one Cd(1) and one C(7) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Cd(1) and one C(7) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cd(1) and one C(19) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one Cd(2) and one C(12) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one Cd(2) and one C(12) atom. In the sixth O site, O(6) is bonded in an L-shaped geometry to one Cd(1) and one C(19) atom. Linkers: 1 c1cnc(C2=NN=C(c3cnccn3)[N]2)cn1 ,3 c1cnc(C2=NC(c3cnccn3)=N[N]2)cn1 ,4 [O]C(=O)c1cc(C([O])=O)cc(C([O])=O)c1. Metal clusters: 2 [C]1O[Cd]2(O1)O[C]O[Cd]1(O[C]O1)O[C]O2 ,2 O=[C]O[Cd]1[N][N][Cd](O[C]=O)[N][N]1. The MOF has largest included sphere 5.71 A, density 1.39 g/cm3, surface area 3235.41 m2/g, accessible volume 0.36 cm3/g