Na2ZnC4H18(N9O4)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one N(16), one O(2), one O(3), one O(4), and two equivalent O(5) atoms to form NaNO5 octahedra that share  an edgeedge with one Na(1)NO5 octahedra and  an edgeedge with one Na(2)O6 octahedra. The Na(1)-N(16) bond length is 2.59 Å. The Na(1)-O(2) bond length is 2.30 Å. The Na(1)-O(3) bond length is 2.42 Å. The Na(1)-O(4) bond length is 2.43 Å. There is one shorter (2.44 Å) and one longer (2.45 Å) Na(1)-O(5) bond length. In the second Na site, Na(2) is bonded to one O(2), one O(3), one O(7), one O(8), and two equivalent O(6) atoms to form distorted NaO6 octahedra that share  an edgeedge with one Na(1)NO5 octahedra and  an edgeedge with one Na(2)O6 octahedra. The Na(2)-O(2) bond length is 2.39 Å. The Na(2)-O(3) bond length is 2.45 Å. The Na(2)-O(7) bond length is 2.51 Å. The Na(2)-O(8) bond length is 2.33 Å. There is one shorter (2.42 Å) and one longer (2.45 Å) Na(2)-O(6) bond length. Zn(1) is bonded in a trigonal bipyramidal geometry to one N(1), one N(10), one N(18), one N(9), and one O(1) atom. The Zn(1)-N(1) bond length is 2.09 Å. The Zn(1)-N(10) bond length is 2.09 Å. The Zn(1)-N(18) bond length is 2.04 Å. The Zn(1)-N(9) bond length is 2.03 Å. The Zn(1)-O(1) bond length is 2.17 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one N(1), one N(4), and one N(5) atom. The C(1)-N(1) bond length is 1.35 Å. The C(1)-N(4) bond length is 1.34 Å. The C(1)-N(5) bond length is 1.37 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one N(5), one N(6), and one N(9) atom. The C(2)-N(5) bond length is 1.36 Å. The C(2)-N(6) bond length is 1.34 Å. The C(2)-N(9) bond length is 1.35 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one N(10), one N(13), and one N(14) atom. The C(3)-N(10) bond length is 1.35 Å. The C(3)-N(13) bond length is 1.35 Å. The C(3)-N(14) bond length is 1.37 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one N(14), one N(15), and one N(18) atom. The C(4)-N(14) bond length is 1.37 Å. The C(4)-N(15) bond length is 1.35 Å. The C(4)-N(18) bond length is 1.35 Å. There are eighteen inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Zn(1), one C(1), and one N(2) atom. The N(1)-N(2) bond length is 1.36 Å. In the second N site, N(2) is bonded in a water-like geometry to one N(1) and one N(3) atom. The N(2)-N(3) bond length is 1.30 Å. In the third N site, N(3) is bonded in a 3-coordinate geometry to one N(2), one N(4), and one H(17) atom. The N(3)-N(4) bond length is 1.36 Å. The N(3)-H(17) bond length is 1.82 Å. In the fourth N site, N(4) is bonded in a 3-coordinate geometry to one C(1), one N(3), and one H(4) atom. The N(4)-H(4) bond length is 1.62 Å. In the fifth N site, N(5) is bonded in a trigonal planar geometry to one C(1), one C(2), and one H(1) atom. The N(5)-H(1) bond length is 1.03 Å. In the sixth N site, N(6) is bonded in a distorted single-bond geometry to one C(2), one N(7), and one H(9) atom. The N(6)-N(7) bond length is 1.36 Å. The N(6)-H(9) bond length is 1.78 Å. In the seventh N site, N(7) is bonded in a distorted water-like geometry to one N(6) and one N(8) atom. The N(7)-N(8) bond length is 1.30 Å. In the eighth N site, N(8) is bonded in a distorted water-like geometry to one N(7) and one N(9) atom. The N(8)-N(9) bond length is 1.35 Å. In the ninth N site, N(9) is bonded in a distorted trigonal planar geometry to one Zn(1), one C(2), and one N(8) atom. In the tenth N site, N(10) is bonded in a distorted trigonal planar geometry to one Zn(1), one C(3), and one N(11) atom. The N(10)-N(11) bond length is 1.35 Å. In the eleventh N site, N(11) is bonded in a water-like geometry to one N(10) and one N(12) atom. The N(11)-N(12) bond length is 1.32 Å. In the twelfth N site, N(12) is bonded in a 3-coordinate geometry to one N(11), one N(13), and one H(5) atom. The N(12)-N(13) bond length is 1.35 Å. The N(12)-H(5) bond length is 1.80 Å. In the thirteenth N site, N(13) is bonded in a distorted water-like geometry to one C(3) and one N(12) atom. In the fourteenth N site, N(14) is bonded in a trigonal planar geometry to one C(3), one C(4), and one H(2) atom. The N(14)-H(2) bond length is 1.04 Å. In the fifteenth N site, N(15) is bonded in a distorted trigonal planar geometry to one C(4), one N(16), and one H(16) atom. The N(15)-N(16) bond length is 1.35 Å. The N(15)-H(16) bond length is 1.70 Å. In the sixteenth N site, N(16) is bonded in a trigonal planar geometry to one Na(1), one N(15), and one N(17) atom. The N(16)-N(17) bond length is 1.31 Å. In the seventeenth N site, N(17) is bonded in a water-like geometry to one N(16) and one N(18) atom. The N(17)-N(18) bond length is 1.36 Å. In the eighteenth N site, N(18) is bonded in a distorted trigonal planar geometry to one Zn(1), one C(4), and one N(17) atom. There are eighteen inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one N(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one N(14) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(1) atom. The H(3)-O(1) bond length is 1.00 Å. In the fourth H site, H(4) is bonded in a distorted linear geometry to one N(4) and one O(1) atom. The H(4)-O(1) bond length is 1.03 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one N(12) and one O(2) atom. The H(5)-O(2) bond length is 0.99 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(2) atom. The H(6)-O(2) bond length is 0.99 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(3) atom. The H(7)-O(3) bond length is 0.99 Å. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(3) atom. The H(8)-O(3) bond length is 0.98 Å. In the ninth H site, H(9) is bonded in a single-bond geometry to one N(6) and one O(4) atom. The H(9)-O(4) bond length is 1.00 Å. In the tenth H site, H(10) is bonded in a single-bond geometry to one O(4) atom. The H(10)-O(4) bond length is 0.98 Å. In the eleventh H site, H(11) is bonded in a single-bond geometry to one O(5) atom. The H(11)-O(5) bond length is 0.98 Å. In the twelfth H site, H(12) is bonded in a single-bond geometry to one O(5) atom. The H(12)-O(5) bond length is 0.99 Å. In the thirteenth H site, H(13) is bonded in a single-bond geometry to one O(6) atom. The H(13)-O(6) bond length is 0.99 Å. In the fourteenth H site, H(14) is bonded in a single-bond geometry to one O(6) atom. The H(14)-O(6) bond length is 0.98 Å. In the fifteenth H site, H(15) is bonded in a single-bond geometry to one O(7) atom. The H(15)-O(7) bond length is 0.99 Å. In the sixteenth H site, H(16) is bonded in a single-bond geometry to one N(15) and one O(7) atom. The H(16)-O(7) bond length is 1.02 Å. In the seventeenth H site, H(17) is bonded in a single-bond geometry to one N(3) and one O(8) atom. The H(17)-O(8) bond length is 0.99 Å. In the eighteenth H site, H(18) is bonded in a single-bond geometry to one O(8) atom. The H(18)-O(8) bond length is 0.98 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Zn(1), one H(3), and one H(4) atom. In the second O site, O(2) is bonded in a distorted water-like geometry to one Na(1), one Na(2), one H(5), and one H(6) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Na(1), one Na(2), one H(7), and one H(8) atom. In the fourth O site, O(4) is bonded in a distorted water-like geometry to one Na(1), one H(10), and one H(9) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to two equivalent Na(1), one H(11), and one H(12) atom. In the sixth O site, O(6) is bonded in a distorted water-like geometry to two equivalent Na(2), one H(13), and one H(14) atom. In the seventh O site, O(7) is bonded in a water-like geometry to one Na(2), one H(15), and one H(16) atom. In the eighth O site, O(8) is bonded in a distorted water-like geometry to one Na(2), one H(17), and one H(18) atom. Linkers: 2 [N]1N=NN=C1NC1=NN=N[N]1. Metal clusters: 4 [Na] ,2 [Zn]. The MOF has largest included sphere 1.95 A, density 1.88 g/cm3, surface area 3557.08 m2/g, accessible volume 0.09 cm3/g