ZrC8P4H18(NO8)2 crystallizes in the monoclinic P2_1/c space group. Zr(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms to form ZrO6 octahedra that share corners with two equivalent P(2)CO3 tetrahedra and corners with four equivalent P(1)CO3 tetrahedra. Both Zr(1)-O(1) bond lengths are 2.11 Å. Both Zr(1)-O(2) bond lengths are 2.07 Å. Both Zr(1)-O(6) bond lengths are 2.07 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded to one P(1), one N(1), one H(2), and one H(3) atom to form distorted corner-sharing CPH2N tetrahedra. The C(1)-P(1) bond length is 1.83 Å. The C(1)-N(1) bond length is 1.50 Å. The C(1)-H(2) bond length is 1.10 Å. The C(1)-H(3) bond length is 1.10 Å. In the second C site, C(2) is bonded to one P(2), one N(1), one H(4), and one H(5) atom to form distorted corner-sharing CPH2N tetrahedra. The C(2)-P(2) bond length is 1.82 Å. The C(2)-N(1) bond length is 1.50 Å. The C(2)-H(4) bond length is 1.10 Å. The C(2)-H(5) bond length is 1.10 Å. In the third C site, C(3) is bonded in a distorted trigonal non-coplanar geometry to one N(1), one H(7), and one H(8) atom. The C(3)-N(1) bond length is 1.51 Å. The C(3)-H(7) bond length is 1.10 Å. The C(3)-H(8) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. The C(4)-O(7) bond length is 1.24 Å. The C(4)-O(8) bond length is 1.31 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one C(1), one O(1), one O(2), and one O(3) atom to form distorted PCO3 tetrahedra that share corners with two equivalent Zr(1)O6 octahedra and  a cornercorner with one N(1)HC3 tetrahedra. The corner-sharing octahedral tilt angles range from 22-37°. The P(1)-O(1) bond length is 1.54 Å. The P(1)-O(2) bond length is 1.54 Å. The P(1)-O(3) bond length is 1.52 Å. In the second P site, P(2) is bonded to one C(2), one O(4), one O(5), and one O(6) atom to form PCO3 tetrahedra that share  a cornercorner with one Zr(1)O6 octahedra and  a cornercorner with one N(1)HC3 tetrahedra. The corner-sharing octahedral tilt angles are 19°. The P(2)-O(4) bond length is 1.51 Å. The P(2)-O(5) bond length is 1.56 Å. The P(2)-O(6) bond length is 1.53 Å. N(1) is bonded to one C(1), one C(2), one C(3), and one H(6) atom to form NHC3 tetrahedra that share  a cornercorner with one P(1)CO3 tetrahedra and  a cornercorner with one P(2)CO3 tetrahedra. The N(1)-H(6) bond length is 1.05 Å. There are nine inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(3) and one O(5) atom. The H(1)-O(3) bond length is 1.37 Å. The H(1)-O(5) bond length is 1.08 Å. In the second H site, H(2) is bonded in a single-bond geometry to one C(1) atom. 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(2) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(2) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one N(1) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(3) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(3) atom. In the ninth H site, H(9) is bonded in a linear geometry to one O(4) and one O(8) atom. The H(9)-O(4) bond length is 1.41 Å. The H(9)-O(8) bond length is 1.07 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Zr(1) and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Zr(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one P(1) and one H(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one P(2) and one H(9) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one P(2) and one H(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Zr(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one C(4) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one C(4) and one H(9) atom. Linkers: 2 OC(=O)C[NH](CP(=O)([O])O)CP(=O)([O])[O] ,2 OC(=O)C[NH](CP(=O)(O)[O])CP(=O)([O])[O]. Metal clusters: 2 [Zr]. RCSR code: dia. The MOF has largest included sphere 2.89 A, density 1.88 g/cm3, surface area 3444.18 m2/g, accessible volume 0.17 cm3/g