CoC4P4H16(NO6)2 crystallizes in the monoclinic P2_1/c space group. Co(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form CoO6 octahedra that share corners with two equivalent P(1)CO3 tetrahedra and corners with four equivalent P(2)CO3 tetrahedra. Both Co(1)-O(2) bond lengths are 2.04 Å. Both Co(1)-O(4) bond lengths are 2.10 Å. Both Co(1)-O(5) bond lengths are 2.14 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded to one P(2), one N(1), one H(1), and one H(2) atom to form distorted corner-sharing CPH2N tetrahedra. The C(1)-P(2) bond length is 1.83 Å. The C(1)-N(1) bond length is 1.49 Å. The C(1)-H(1) bond length is 1.10 Å. The C(1)-H(2) bond length is 1.10 Å. In the second C site, C(2) is bonded to one P(1), one N(1), one H(4), and one H(5) atom to form distorted corner-sharing CPH2N tetrahedra. The C(2)-P(1) bond length is 1.84 Å. The C(2)-N(1) bond length is 1.49 Å. The C(2)-H(4) bond length is 1.09 Å. The C(2)-H(5) bond length is 1.10 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one C(2), one O(1), one O(2), and one O(6) atom to form PCO3 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra and  a cornercorner with one N(1)H2C2 tetrahedra. The corner-sharing octahedral tilt angles are 40°. The P(1)-O(1) bond length is 1.53 Å. The P(1)-O(2) bond length is 1.51 Å. The P(1)-O(6) bond length is 1.58 Å. In the second P site, P(2) is bonded to one C(1), one O(3), one O(4), and one O(5) atom to form distorted PCO3 tetrahedra that share corners with two equivalent Co(1)O6 octahedra and  a cornercorner with one N(1)H2C2 tetrahedra. The corner-sharing octahedral tilt angles range from 45-51°. The P(2)-O(3) bond length is 1.59 Å. The P(2)-O(4) bond length is 1.51 Å. The P(2)-O(5) bond length is 1.52 Å. N(1) is bonded to one C(1), one C(2), one H(3), and one H(6) atom to form NH2C2 tetrahedra that share  a cornercorner with one P(1)CO3 tetrahedra and  a cornercorner with one P(2)CO3 tetrahedra. The N(1)-H(3) bond length is 1.06 Å. The N(1)-H(6) bond length is 1.04 Å. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. 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 distorted single-bond geometry to one N(1) and one O(1) atom. The H(3)-O(1) bond length is 1.65 Å. 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 linear geometry to one O(1) and one O(6) atom. The H(7)-O(1) bond length is 1.50 Å. The H(7)-O(6) bond length is 1.04 Å. In the eighth H site, H(8) is bonded in a linear geometry to one O(3) and one O(5) atom. The H(8)-O(3) bond length is 1.03 Å. The H(8)-O(5) bond length is 1.53 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one P(1), one H(3), and one H(7) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Co(1) and one P(1) atom. In the third O site, O(3) is bonded in a water-like geometry to one P(2) and one H(8) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Co(1), one P(2), and one H(8) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one P(1) and one H(7) atom. Linkers: 4 [O]P(=O)(C[NH2]CP(=O)(O)[O])O. Metal clusters: 2 [Co]. The MOF has largest included sphere 1.99 A, density 2.11 g/cm3, surface area 3292.11 m2/g, accessible volume 0.09 cm3/g