ZnC4PN2H3O3 crystallizes in the monoclinic P2_1/c space group. Zn(1) is bonded to one N(1), one N(2), one O(1), one O(2), and one O(3) atom to form ZnN2O3 trigonal bipyramids that share corners with three equivalent P(1)CO3 tetrahedra. The Zn(1)-N(1) bond length is 2.21 Å. The Zn(1)-N(2) bond length is 2.21 Å. The Zn(1)-O(1) bond length is 2.01 Å. The Zn(1)-O(2) bond length is 2.00 Å. The Zn(1)-O(3) bond length is 1.99 Å. There are four inequivalent C sites. In the first C site, C(4) is bonded in a distorted trigonal planar geometry to one C(3), one N(1), and one H(3) atom. The C(4)-C(3) bond length is 1.39 Å. The C(4)-N(1) bond length is 1.34 Å. The C(4)-H(3) bond length is 1.09 Å. In the second C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one P(1), and one N(1) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-P(1) bond length is 1.83 Å. The C(1)-N(1) bond length is 1.34 Å. In the third C site, C(2) is bonded in a distorted trigonal planar geometry to one C(1), one N(2), and one H(1) atom. The C(2)-N(2) bond length is 1.34 Å. The C(2)-H(1) bond length is 1.09 Å. In the fourth C site, C(3) is bonded in a distorted trigonal planar geometry to one C(4), one N(2), and one H(2) atom. The C(3)-N(2) bond length is 1.34 Å. The C(3)-H(2) bond length is 1.09 Å. 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 three equivalent Zn(1)N2O3 trigonal bipyramids. 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 1.54 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Zn(1), one C(1), and one C(4) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one Zn(1), one C(2), and one C(3) atom. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) 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(4) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Zn(1) and one P(1) atom. Linkers: 4 [O]P([O])(=O)c1cnccn1. Metal clusters: 4 [Zn]. The MOF has largest included sphere 1.50 A, density 2.43 g/cm3, surface area 2875.48 m2/g, accessible volume 0.07 cm3/g