ZnC18P2H18(NO3)2 crystallizes in the triclinic P-1 space group. Zn(1) is bonded to one N(1), one N(2), one O(1), one O(3), and one O(6) atom to form ZnN2O3 trigonal bipyramids that share  a cornercorner with one P(2)CO3 tetrahedra and corners with two equivalent P(1)CO3 tetrahedra. The Zn(1)-N(1) bond length is 2.17 Å. The Zn(1)-N(2) bond length is 2.12 Å. The Zn(1)-O(1) bond length is 1.98 Å. The Zn(1)-O(3) bond length is 2.06 Å. The Zn(1)-O(6) bond length is 2.03 Å. There are eighteen inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal non-coplanar geometry to one C(2), one H(3), one H(4), and one H(5) atom. The C(1)-C(2) bond length is 1.50 Å. The C(1)-H(3) bond length is 1.10 Å. The C(1)-H(4) bond length is 1.10 Å. The C(1)-H(5) bond length is 1.10 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(4) atom. The C(2)-C(3) bond length is 1.41 Å. The C(2)-C(4) bond length is 1.40 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one P(1) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-P(1) bond length is 1.81 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(2), one C(3), and one H(6) atom. The C(4)-H(6) bond length is 1.09 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(7), one C(8), and one H(7) atom. The C(5)-C(7) bond length is 1.40 Å. The C(5)-C(8) bond length is 1.40 Å. The C(5)-H(7) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted trigonal non-coplanar geometry to one C(7), one H(10), one H(8), and one H(9) atom. The C(6)-C(7) bond length is 1.51 Å. The C(6)-H(10) bond length is 1.10 Å. The C(6)-H(8) bond length is 1.10 Å. The C(6)-H(9) bond length is 1.10 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(5), one C(6), and one C(8) atom. The C(7)-C(8) bond length is 1.41 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(5), one C(7), and one P(2) atom. The C(8)-P(2) bond length is 1.80 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(10), one N(1), and one H(11) atom. The C(9)-C(10) bond length is 1.39 Å. The C(9)-N(1) bond length is 1.34 Å. The C(9)-H(11) bond length is 1.09 Å. In the tenth C site, C(10) is bonded in a distorted trigonal planar geometry to one C(11), one C(9), and one H(12) atom. The C(10)-C(11) bond length is 1.40 Å. The C(10)-H(12) bond length is 1.09 Å. In the eleventh C site, C(11) is bonded in a distorted single-bond geometry to one C(10), one C(12), and one H(13) atom. The C(11)-C(12) bond length is 1.39 Å. The C(11)-H(13) bond length is 1.09 Å. In the twelfth C site, C(12) is bonded in a distorted trigonal planar geometry to one C(11), one C(13), and one H(14) atom. The C(12)-C(13) bond length is 1.40 Å. The C(12)-H(14) bond length is 1.09 Å. In the thirteenth C site, C(13) is bonded in a distorted trigonal planar geometry to one C(12), one C(14), and one N(1) atom. The C(13)-C(14) bond length is 1.48 Å. The C(13)-N(1) bond length is 1.35 Å. In the fourteenth C site, C(14) is bonded in a distorted trigonal planar geometry to one C(13), one C(15), and one N(2) atom. The C(14)-C(15) bond length is 1.40 Å. The C(14)-N(2) bond length is 1.35 Å. In the fifteenth C site, C(15) is bonded in a distorted trigonal planar geometry to one C(14), one C(16), and one H(15) atom. The C(15)-C(16) bond length is 1.39 Å. The C(15)-H(15) bond length is 1.09 Å. In the sixteenth C site, C(16) is bonded in a distorted trigonal planar geometry to one C(15), one C(17), and one H(16) atom. The C(16)-C(17) bond length is 1.39 Å. The C(16)-H(16) bond length is 1.09 Å. In the seventeenth C site, C(17) is bonded in a distorted single-bond geometry to one C(16) and one H(17) atom. The C(17)-H(17) bond length is 1.09 Å. In the eighteenth C site, C(18) is bonded in a distorted bent 120 degrees geometry to one N(2) and one H(18) atom. The C(18)-N(2) bond length is 1.34 Å. The C(18)-H(18) bond length is 1.09 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one C(3), one O(1), one O(2), and one O(3) atom to form PCO3 tetrahedra that share corners with two equivalent Zn(1)N2O3 trigonal bipyramids. The P(1)-O(1) bond length is 1.52 Å. The P(1)-O(2) bond length is 1.60 Å. The P(1)-O(3) bond length is 1.52 Å. In the second P site, P(2) is bonded to one C(8), one O(4), one O(5), and one O(6) atom to form PCO3 tetrahedra that share  a cornercorner with one Zn(1)N2O3 trigonal bipyramid. The P(2)-O(4) bond length is 1.52 Å. The P(2)-O(5) bond length is 1.57 Å. The P(2)-O(6) bond length is 1.54 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Zn(1), one C(13), and one C(9) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one Zn(1), one C(14), and one C(18) atom. There are eighteen inequivalent H sites. In the first H site, H(1) is bonded in a distorted linear geometry to one O(2) and one O(6) atom. The H(1)-O(2) bond length is 1.01 Å. The H(1)-O(6) bond length is 1.59 Å. In the second H site, H(2) is bonded in a linear geometry to one O(4) and one O(5) atom. The H(2)-O(4) bond length is 1.37 Å. The H(2)-O(5) bond length is 1.08 Å. In the third H site, H(3) is bonded in a single-bond geometry to one C(1) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(1) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(1) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(4) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(5) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(6) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(6) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(6) atom. In the eleventh H site, H(11) is bonded in a single-bond geometry to one C(9) atom. In the twelfth H site, H(12) is bonded in a single-bond geometry to one C(10) atom. In the thirteenth H site, H(13) is bonded in a single-bond geometry to one C(11) atom. In the fourteenth H site, H(14) is bonded in a single-bond geometry to one C(12) atom. In the fifteenth H site, H(15) is bonded in a single-bond geometry to one C(15) atom. In the sixteenth H site, H(16) is bonded in a single-bond geometry to one C(16) atom. In the seventeenth H site, H(17) is bonded in a single-bond geometry to one C(17) atom. In the eighteenth H site, H(18) 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 bent 150 degrees geometry to one Zn(1) and one P(1) atom. In the second O site, O(2) is bonded in a water-like geometry to one P(1) and one H(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Zn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one P(2) and one H(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one P(2) and one H(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Zn(1), one P(2), and one H(1) atom. Linkers: 2 Cc1cc(P([O])(=O)O)c(C)cc1P([O])(=O)O. Metal clusters: 1 [O]P(O)O[Zn]1OP(O)O[Zn](OP([O])O)OP(O)O1. RCSR code: sql. The MOF has largest included sphere 2.64 A, density 1.65 g/cm3, surface area 4301.36 m2/g, accessible volume 0.14 cm3/g