CoC9PN2H9O3 crystallizes in the monoclinic C2/c space group. Co(1) is bonded to one N(1), one O(1), one O(2), and one O(3) atom to form CoNO3 tetrahedra that share corners with three equivalent P(1)HO3 tetrahedra. The Co(1)-N(1) bond length is 1.98 Å. The Co(1)-O(1) bond length is 1.94 Å. The Co(1)-O(2) bond length is 1.93 Å. The Co(1)-O(3) bond length is 1.94 Å. There are nine inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one N(1), one N(2), and one H(2) atom. The C(1)-N(1) bond length is 1.34 Å. The C(1)-N(2) bond length is 1.35 Å. The C(1)-H(2) bond length is 1.09 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(3), one N(1), and one H(3) atom. The C(2)-C(3) bond length is 1.37 Å. The C(2)-N(1) bond length is 1.39 Å. The C(2)-H(3) bond length is 1.08 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(2), one N(2), and one H(4) atom. The C(3)-N(2) bond length is 1.38 Å. The C(3)-H(4) bond length is 1.08 Å. In the fourth C site, C(4) is bonded in a distorted trigonal non-coplanar geometry to one C(5), one N(2), one H(5), and one H(6) atom. The C(4)-C(5) bond length is 1.51 Å. The C(4)-N(2) bond length is 1.46 Å. The C(4)-H(5) bond length is 1.10 Å. The C(4)-H(6) bond length is 1.10 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(7) atom. The C(5)-C(6) bond length is 1.38 Å. The C(5)-C(7) bond length is 1.43 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(5) and one H(7) atom. The C(6)-H(7) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(5), one C(7), and one C(8) atom. The C(7)-C(7) bond length is 1.44 Å. The C(7)-C(8) bond length is 1.42 Å. In the eighth C site, C(8) is bonded in a distorted trigonal planar geometry to one C(7), one C(9), and one H(8) atom. The C(8)-C(9) bond length is 1.38 Å. The C(8)-H(8) bond length is 1.09 Å. In the ninth C site, C(9) is bonded in a distorted single-bond geometry to one C(8) and one H(9) atom. The C(9)-H(9) bond length is 1.09 Å. P(1) is bonded to one H(1), one O(1), one O(2), and one O(3) atom to form distorted PHO3 tetrahedra that share corners with three equivalent Co(1)NO3 tetrahedra. The P(1)-H(1) bond length is 1.41 Å. The P(1)-O(1) bond length is 1.55 Å. The P(1)-O(2) bond length is 1.53 Å. The P(1)-O(3) 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 Co(1), one C(1), and one C(2) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(4) atom. There are nine inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one P(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 single-bond geometry to one C(2) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(3) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(4) 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(6) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(8) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(9) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Co(1) and one P(1) 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 bent 120 degrees geometry to one Co(1) and one P(1) atom. Linkers: 2 c1ccc2c(Cn3ccnc3)ccc(Cn3ccnc3)c2c1. Metal clusters: 4 [Co]. The MOF has largest included sphere 2.11 A, density 1.81 g/cm3, surface area 3846.05 m2/g, accessible volume 0.11 cm3/g