ZnC6PNH4O5 crystallizes in the monoclinic Pc space group. Zn(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form ZnO4 tetrahedra that share corners with three equivalent P(1)CO3 tetrahedra. The Zn(1)-O(1) bond length is 1.95 Å. The Zn(1)-O(2) bond length is 1.99 Å. The Zn(1)-O(3) bond length is 1.98 Å. The Zn(1)-O(4) bond length is 1.97 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one N(1), and one H(1) atom. The C(1)-C(2) bond length is 1.39 Å. The C(1)-N(1) bond length is 1.35 Å. The C(1)-H(1) bond length is 1.09 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one P(1) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-P(1) bond length is 1.82 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(2) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-H(2) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(6) atom. The C(4)-C(5) bond length is 1.39 Å. The C(4)-C(6) bond length is 1.51 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(4), one N(1), and one H(3) atom. The C(5)-N(1) bond length is 1.35 Å. The C(5)-H(3) bond length is 1.08 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(4), and one O(5) atom. The C(6)-O(4) bond length is 1.29 Å. The C(6)-O(5) bond length is 1.25 Å. P(1) is bonded to one C(2), one O(1), one O(2), and one O(3) atom to form PCO3 tetrahedra that share corners with three equivalent Zn(1)O4 tetrahedra. The P(1)-O(1) bond length is 1.53 Å. The P(1)-O(2) bond length is 1.53 Å. The P(1)-O(3) bond length is 1.55 Å. N(1) is bonded in a trigonal planar geometry to one C(1), one C(5), and one H(4) atom. The N(1)-H(4) bond length is 1.03 Å. There are four 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(3) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(5) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one N(1) atom. There are five inequivalent O sites. In the first O site, O(4) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(6) atom. In the second O site, O(5) is bonded in a single-bond geometry to one C(6) atom. In the third O site, O(1) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(1) atom. In the fourth O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(1) atom. In the fifth O site, O(3) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(1) atom. Linkers: 2 [O]C(=O)C1=CN[CH]C(P([O])([O])=O)=C1. Metal clusters: 2 [Zn]. RCSR code: hcb. The MOF has largest included sphere 2.25 A, density 2.13 g/cm3, surface area 3205.39 m2/g, accessible volume 0.14 cm3/g