CoC4P2N3H7O7 crystallizes in the triclinic P-1 space group. Co(1) is bonded to one N(1), one O(2), one O(3), one O(4), and two equivalent O(1) atoms to form CoNO5 octahedra that share corners with two equivalent P(1)CO3 tetrahedra, corners with three equivalent P(2)CO3 tetrahedra, and  an edgeedge with one Co(1)NO5 octahedra. The Co(1)-N(1) bond length is 2.11 Å. The Co(1)-O(2) bond length is 2.07 Å. The Co(1)-O(3) bond length is 2.06 Å. The Co(1)-O(4) bond length is 2.06 Å. There is one shorter (2.14 Å) and one longer (2.26 Å) Co(1)-O(1) bond length. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal non-coplanar geometry to one C(2), one N(2), one H(3), and one H(4) atom. The C(1)-C(2) bond length is 1.54 Å. The C(1)-N(2) bond length is 1.46 Å. The C(1)-H(3) bond length is 1.10 Å. The C(1)-H(4) bond length is 1.10 Å. In the second C site, C(2) is bonded in a distorted tetrahedral geometry to one C(1), one P(1), one P(2), and one O(5) atom. The C(2)-P(1) bond length is 1.86 Å. The C(2)-P(2) bond length is 1.86 Å. The C(2)-O(5) bond length is 1.42 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one N(1), one N(2), and one H(5) atom. The C(3)-N(1) bond length is 1.34 Å. The C(3)-N(2) bond length is 1.35 Å. The C(3)-H(5) bond length is 1.08 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one N(1), one N(3), and one H(6) atom. The C(4)-N(1) bond length is 1.36 Å. The C(4)-N(3) bond length is 1.33 Å. The C(4)-H(6) bond length is 1.09 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one C(2), one O(2), one O(3), and one O(7) atom to form distorted PCO3 tetrahedra that share corners with two equivalent Co(1)NO5 octahedra and  a cornercorner with one P(2)CO3 tetrahedra. The corner-sharing octahedral tilt angles range from 36-43°. The P(1)-O(2) bond length is 1.52 Å. The P(1)-O(3) bond length is 1.52 Å. The P(1)-O(7) bond length is 1.58 Å. In the second P site, P(2) is bonded to one C(2), one O(1), one O(4), and one O(6) atom to form distorted PCO3 tetrahedra that share corners with three equivalent Co(1)NO5 octahedra and  a cornercorner with one P(1)CO3 tetrahedra. The corner-sharing octahedral tilt angles range from 40-50°. The P(2)-O(1) bond length is 1.52 Å. The P(2)-O(4) bond length is 1.51 Å. The P(2)-O(6) bond length is 1.63 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Co(1), one C(3), and one C(4) atom. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one C(1), one C(3), and one N(3) atom. The N(2)-N(3) bond length is 1.36 Å. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one C(4), one N(2), and one H(2) atom. The N(3)-H(2) bond length is 1.63 Å. There are seven inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(6) atom. The H(1)-O(6) bond length is 0.98 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one N(3) and one O(7) atom. The H(2)-O(7) bond length is 1.02 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(3) 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 distorted single-bond geometry to one O(2) and one O(5) atom. The H(7)-O(2) bond length is 1.63 Å. The H(7)-O(5) bond length is 1.01 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Co(1) and one P(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Co(1), one P(1), and one H(7) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Co(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Co(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one C(2) and one H(7) atom. In the sixth O site, O(6) is bonded in a distorted water-like geometry to one P(2) and one H(1) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one P(1) and one H(2) atom. Linkers: 2 [O]P(=O)(O)C(O)(CN1[CH]N=C[N]1)P([O])(=O)O. Metal clusters: 2 [Co]. The MOF has largest included sphere 2.09 A, density 2.37 g/cm3, surface area 2546.09 m2/g, accessible volume 0.05 cm3/g