Zn2C11N3H7O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one N(2), one N(3), one O(3), one O(5), and one O(6) atom to form corner-sharing ZnN2O3 trigonal bipyramids. The Zn(1)-N(2) bond length is 2.01 Å. The Zn(1)-N(3) bond length is 1.98 Å. The Zn(1)-O(3) bond length is 2.38 Å. The Zn(1)-O(5) bond length is 1.96 Å. The Zn(1)-O(6) bond length is 2.09 Å. In the second Zn site, Zn(2) is bonded to one N(1), one O(1), one O(3), and one O(7) atom to form corner-sharing ZnNO3 trigonal pyramids. The Zn(2)-N(1) bond length is 2.05 Å. The Zn(2)-O(1) bond length is 1.97 Å. The Zn(2)-O(3) bond length is 2.01 Å. The Zn(2)-O(7) bond length is 1.99 Å. There are eleven 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 1.41 Å. The C(1)-C(6) bond length is 1.40 Å. The C(1)-C(7) bond length is 1.50 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(8) atom. The C(2)-C(3) bond length is 1.41 Å. The C(2)-C(8) bond length is 1.51 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(9) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-C(9) bond length is 1.50 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 H(3) atom. The C(4)-C(5) bond length is 1.39 Å. The C(4)-H(3) bond length is 1.09 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(4) and one H(4) atom. The C(5)-H(4) 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) and one H(5) atom. The C(6)-H(5) 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(1), and one O(2) atom. The C(7)-O(1) bond length is 1.29 Å. The C(7)-O(2) bond length is 1.26 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(3), and one O(4) atom. The C(8)-O(3) bond length is 1.29 Å. The C(8)-O(4) bond length is 1.25 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(5), and one O(6) atom. The C(9)-O(5) bond length is 1.28 Å. The C(9)-O(6) bond length is 1.27 Å. In the tenth C site, C(10) is bonded in a trigonal planar geometry to one N(2), one N(3), and one H(6) atom. The C(10)-N(2) bond length is 1.33 Å. The C(10)-N(3) bond length is 1.35 Å. The C(10)-H(6) bond length is 1.09 Å. In the eleventh C site, C(11) is bonded in a trigonal planar geometry to one N(1), one N(3), and one H(7) atom. The C(11)-N(1) bond length is 1.33 Å. The C(11)-N(3) bond length is 1.36 Å. The C(11)-H(7) bond length is 1.09 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a 3-coordinate geometry to one Zn(2), one C(11), and one N(2) atom. The N(1)-N(2) bond length is 1.37 Å. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Zn(1), one C(10), and one N(1) atom. In the third N site, N(3) is bonded in a trigonal planar geometry to one Zn(1), one C(10), and one C(11) atom. There are seven inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(7) atom. The H(1)-O(7) bond length is 1.00 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(2) and one O(7) atom. The H(2)-O(2) bond length is 1.61 Å. The H(2)-O(7) bond length is 1.01 Å. In the third H site, H(3) is bonded in a single-bond geometry to one C(4) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(5) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(6) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(10) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(11) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one Zn(2) and one C(7) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one C(7) and one H(2) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Zn(1), one Zn(2), and one C(8) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one C(8) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(9) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(9) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Zn(2), one H(1), and one H(2) atom. Linkers: 4 [O]C(=O)c1cccc(C([O])=O)c1C([O])=O ,4 C1=NN=C[N]1. Metal clusters: 2 O.O.O=[C]O[Zn](/N=N\[Zn]1O[C]O[Zn](/N=N\[Zn](O[C]=O)O[C]=O)O[C]O1)O[C]=O. The MOF has largest included sphere 2.03 A, density 2.16 g/cm3, surface area 3278.83 m2/g, accessible volume 0.11 cm3/g