ZnC6N2H4O5 crystallizes in the triclinic P1 space group. There are four inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a trigonal bipyramidal geometry to one N(1), one N(6), one O(1), one O(10), and one O(19) atom. The Zn(1)-N(1) bond length is 2.03 Å. The Zn(1)-N(6) bond length is 2.00 Å. The Zn(1)-O(1) bond length is 2.15 Å. The Zn(1)-O(10) bond length is 2.30 Å. The Zn(1)-O(19) bond length is 2.01 Å. In the second Zn site, Zn(2) is bonded in a trigonal bipyramidal geometry to one N(2), one N(5), one O(2), one O(20), and one O(9) atom. The Zn(2)-N(2) bond length is 2.03 Å. The Zn(2)-N(5) bond length is 2.00 Å. The Zn(2)-O(2) bond length is 2.15 Å. The Zn(2)-O(20) bond length is 2.01 Å. The Zn(2)-O(9) bond length is 2.29 Å. In the third Zn site, Zn(3) is bonded in a trigonal bipyramidal geometry to one N(3), one N(8), one O(12), one O(17), and one O(3) atom. The Zn(3)-N(3) bond length is 2.03 Å. The Zn(3)-N(8) bond length is 2.01 Å. The Zn(3)-O(12) bond length is 2.29 Å. The Zn(3)-O(17) bond length is 2.01 Å. The Zn(3)-O(3) bond length is 2.15 Å. In the fourth Zn site, Zn(4) is bonded in a trigonal bipyramidal geometry to one N(4), one N(7), one O(11), one O(18), and one O(4) atom. The Zn(4)-N(4) bond length is 2.03 Å. The Zn(4)-N(7) bond length is 2.00 Å. The Zn(4)-O(11) bond length is 2.30 Å. The Zn(4)-O(18) bond length is 2.01 Å. The Zn(4)-O(4) bond length is 2.15 Å. There are twenty-four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(1), and one O(5) atom. The C(1)-C(5) bond length is 1.47 Å. The C(1)-O(1) bond length is 1.26 Å. The C(1)-O(5) bond length is 1.29 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(2), and one O(6) atom. The C(2)-C(6) bond length is 1.47 Å. The C(2)-O(2) bond length is 1.26 Å. The C(2)-O(6) bond length is 1.29 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(7), one O(3), and one O(7) atom. The C(3)-C(7) bond length is 1.47 Å. The C(3)-O(3) bond length is 1.26 Å. The C(3)-O(7) bond length is 1.29 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(8), one O(4), and one O(8) atom. The C(4)-C(8) bond length is 1.47 Å. The C(4)-O(4) bond length is 1.26 Å. The C(4)-O(8) bond length is 1.29 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(1), one C(9), and one N(1) atom. The C(5)-C(9) bond length is 1.39 Å. The C(5)-N(1) bond length is 1.37 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(10), one C(2), and one N(2) atom. The C(6)-C(10) bond length is 1.39 Å. The C(6)-N(2) bond length is 1.37 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(11), one C(3), and one N(3) atom. The C(7)-C(11) bond length is 1.39 Å. The C(7)-N(3) bond length is 1.37 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to one C(12), one C(4), and one N(4) atom. The C(8)-C(12) bond length is 1.39 Å. The C(8)-N(4) bond length is 1.37 Å. In the ninth C site, C(9) is bonded in a distorted single-bond geometry to one C(13), one C(5), and one N(5) atom. The C(9)-C(13) bond length is 1.46 Å. The C(9)-N(5) bond length is 1.37 Å. In the tenth C site, C(10) is bonded in a distorted single-bond geometry to one C(14), one C(6), and one N(6) atom. The C(10)-C(14) bond length is 1.46 Å. The C(10)-N(6) bond length is 1.37 Å. In the eleventh C site, C(11) is bonded in a distorted single-bond geometry to one C(15), one C(7), and one N(7) atom. The C(11)-C(15) bond length is 1.46 Å. The C(11)-N(7) bond length is 1.37 Å. In the twelfth C site, C(12) is bonded in a distorted single-bond geometry to one C(8) and one N(8) atom. The C(12)-N(8) bond length is 1.37 Å. In the thirteenth C site, C(13) is bonded in a distorted bent 120 degrees geometry to one C(9), one O(13), and one O(9) atom. The C(13)-O(13) bond length is 1.32 Å. The C(13)-O(9) bond length is 1.25 Å. In the fourteenth C site, C(14) is bonded in a distorted bent 120 degrees geometry to one C(10), one O(10), and one O(14) atom. The C(14)-O(10) bond length is 1.25 Å. The C(14)-O(14) bond length is 1.32 Å. In the fifteenth C site, C(15) is bonded in a distorted bent 120 degrees geometry to one C(11), one O(11), and one O(15) atom. The C(15)-O(11) bond length is 1.25 Å. The C(15)-O(15) bond length is 1.32 Å. In the sixteenth C site, C(16) is bonded in a distorted bent 120 degrees geometry to one O(12) and one O(16) atom. The C(16)-O(12) bond length is 1.25 Å. The C(16)-O(16) bond length is 1.32 Å. In the seventeenth C site, C(17) is bonded in a distorted trigonal planar geometry to one C(21), one N(1), and one N(5) atom. The C(17)-C(21) bond length is 1.49 Å. The C(17)-N(1) bond length is 1.35 Å. The C(17)-N(5) bond length is 1.35 Å. In the eighteenth C site, C(18) is bonded in a distorted trigonal planar geometry to one C(22), one N(2), and one N(6) atom. The C(18)-C(22) bond length is 1.49 Å. The C(18)-N(2) bond length is 1.35 Å. The C(18)-N(6) bond length is 1.35 Å. In the nineteenth C site, C(19) is bonded in a distorted trigonal planar geometry to one C(23), one N(3), and one N(7) atom. The C(19)-C(23) bond length is 1.49 Å. The C(19)-N(3) bond length is 1.35 Å. The C(19)-N(7) bond length is 1.35 Å. In the twentieth C site, C(20) is bonded in a distorted trigonal planar geometry to one C(24), one N(4), and one N(8) atom. The C(20)-C(24) bond length is 1.49 Å. The C(20)-N(4) bond length is 1.35 Å. The C(20)-N(8) bond length is 1.35 Å. In the twenty-first C site, C(21) is bonded in a distorted trigonal non-coplanar geometry to one C(17); one H(13,15); one H(9,11); and one O(17) atom. The C(21)-H(13,15) bond length is 1.10 Å. The C(21)-H(9,11) bond length is 1.10 Å. The C(21)-O(17) bond length is 1.44 Å. In the twenty-second C site, C(22) is bonded in a distorted trigonal non-coplanar geometry to one C(18); one H(10,12); one H(14,16); and one O(18) atom. The C(22)-H(10,12) bond length is 1.10 Å. The C(22)-H(14,16) bond length is 1.10 Å. The C(22)-O(18) bond length is 1.44 Å. In the twenty-third C site, C(23) is bonded in a distorted trigonal non-coplanar geometry to one C(19); one H(13,15); one H(9,11); and one O(19) atom. The C(23)-H(13,15) bond length is 1.10 Å. The C(23)-H(9,11) bond length is 1.10 Å. The C(23)-O(19) bond length is 1.44 Å. In the twenty-fourth C site, C(24) is bonded in a distorted trigonal non-coplanar geometry to one C(20); one H(10,12); one H(14,16); and one O(20) atom. The C(24)-H(10,12) bond length is 1.10 Å. The C(24)-H(14,16) bond length is 1.10 Å. The C(24)-O(20) bond length is 1.44 Å. There are eight inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Zn(1), one C(17), and one C(5) atom. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Zn(2), one C(18), and one C(6) atom. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one Zn(3), one C(19), and one C(7) atom. In the fourth N site, N(4) is bonded in a distorted trigonal planar geometry to one Zn(4), one C(20), and one C(8) atom. In the fifth N site, N(5) is bonded in a distorted trigonal planar geometry to one Zn(2), one C(17), and one C(9) atom. In the sixth N site, N(6) is bonded in a distorted trigonal planar geometry to one Zn(1), one C(10), and one C(18) atom. In the seventh N site, N(7) is bonded in a distorted trigonal planar geometry to one Zn(4), one C(11), and one C(19) atom. In the eighth N site, N(8) is bonded in a distorted trigonal planar geometry to one Zn(3), one C(12), and one C(20) atom. There are twelve inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(13) and one O(5) atom. The H(1)-O(13) bond length is 1.05 Å. The H(1)-O(5) bond length is 1.50 Å. In the second H site, H(2) is bonded in a linear geometry to one O(14) and one O(6) atom. The H(2)-O(14) bond length is 1.05 Å. The H(2)-O(6) bond length is 1.50 Å. In the third H site, H(3) is bonded in a linear geometry to one O(15) and one O(7) atom. The H(3)-O(15) bond length is 1.05 Å. The H(3)-O(7) bond length is 1.50 Å. In the fourth H site, H(4) is bonded in a linear geometry to one O(16) and one O(8) atom. The H(4)-O(16) bond length is 1.05 Å. The H(4)-O(8) bond length is 1.50 Å. In the fifth H site, H(5) is bonded in a linear geometry to one O(17) and one O(8) atom. The H(5)-O(17) bond length is 1.02 Å. The H(5)-O(8) bond length is 1.58 Å. In the sixth H site, H(6) is bonded in a linear geometry to one O(18) and one O(7) atom. The H(6)-O(18) bond length is 1.02 Å. The H(6)-O(7) bond length is 1.57 Å. In the seventh H site, H(7) is bonded in a linear geometry to one O(19) and one O(6) atom. The H(7)-O(19) bond length is 1.02 Å. The H(7)-O(6) bond length is 1.57 Å. In the eighth H site, H(8) is bonded in a linear geometry to one O(20) and one O(5) atom. The H(8)-O(20) bond length is 1.02 Å. The H(8)-O(5) bond length is 1.57 Å. In the ninth H site, H(9,11) is bonded in a single-bond geometry to one C(21) atom. In the tenth H site, H(10,12) is bonded in a single-bond geometry to one C(22) atom. In the eleventh H site, H(13,15) is bonded in a single-bond geometry to one C(21) atom. In the twelfth H site, H(14,16) is bonded in a single-bond geometry to one C(22) atom. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one Zn(1) and one C(1) atom. In the second O site, O(2) is bonded in a water-like geometry to one Zn(2) and one C(2) atom. In the third O site, O(3) is bonded in a water-like geometry to one Zn(3) and one C(3) atom. In the fourth O site, O(4) is bonded in a water-like geometry to one Zn(4) and one C(4) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one C(1), one H(1), and one H(8) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one C(2), one H(2), and one H(7) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one C(3), one H(3), and one H(6) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one C(4), one H(4), and one H(5) atom. In the ninth O site, O(9) is bonded in a distorted water-like geometry to one Zn(2) and one C(13) atom. In the tenth O site, O(10) is bonded in a distorted water-like geometry to one Zn(1) and one C(14) atom. In the eleventh O site, O(11) is bonded in a distorted water-like geometry to one Zn(4) and one C(15) atom. In the twelfth O site, O(12) is bonded in a distorted water-like geometry to one Zn(3) and one C(16) atom. In the thirteenth O site, O(13) is bonded in a water-like geometry to one C(13) and one H(1) atom. In the fourteenth O site, O(14) is bonded in a water-like geometry to one C(14) and one H(2) atom. In the fifteenth O site, O(15) is bonded in a water-like geometry to one C(15) and one H(3) atom. In the sixteenth O site, O(16) is bonded in a water-like geometry to one C(16) and one H(4) atom. In the seventeenth O site, O(17) is bonded in a distorted trigonal planar geometry to one Zn(3), one C(21), and one H(5) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one Zn(4), one C(22), and one H(6) atom. In the nineteenth O site, O(19) is bonded in a distorted trigonal planar geometry to one Zn(1), one C(23), and one H(7) atom. In the twentieth O site, O(20) is bonded in a distorted trigonal planar geometry to one Zn(2), one C(24), and one H(8) atom. Linkers: 2 [O]C(=O)C1=NC(CO)=N[C]1C(=O)O ,2 [O]C(=O)C1=C(C(=O)O)[N]C(CO)=N1. Metal clusters: 4 [Zn]. The MOF has largest included sphere 3.41 A, density 1.95 g/cm3, surface area 3148.11 m2/g, accessible volume 0.13 cm3/g