ZnP2H6(C3O4)2 crystallizes in the monoclinic C2/c space group. Zn(1) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form ZnO4 tetrahedra that share corners with four equivalent P(1)CO3 tetrahedra. Both Zn(1)-O(2) bond lengths are 1.98 Å. Both Zn(1)-O(3) bond lengths are 1.93 Å. There are three inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one C(3), and one O(4) atom. The C(1)-C(2) bond length is 1.42 Å. The C(1)-C(3) bond length is 1.40 Å. The C(1)-O(4) bond length is 1.36 Å. In the second C site, C(2) is bonded in a distorted 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 1.79 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(1), one C(2), and one H(3) atom. The C(3)-H(3) bond length is 1.09 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 two equivalent Zn(1)O4 tetrahedra. The P(1)-O(1) bond length is 1.61 Å. The P(1)-O(2) bond length is 1.54 Å. The P(1)-O(3) bond length is 1.51 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. The H(1)-O(1) bond length is 0.97 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(4) atom. The H(2)-O(4) bond length is 0.99 Å. In the third H site, H(3) is bonded in a single-bond geometry to one C(3) atom. There are four inequivalent O sites. In the first O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Zn(1) and one P(1) atom. In the second O site, O(3) is bonded in a bent 150 degrees geometry to one Zn(1) and one P(1) atom. In the third O site, O(4) is bonded in a water-like geometry to one C(1) and one H(2) atom. In the fourth O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one H(1) atom. Linkers: 2 [O]P(=O)(O)c1cc(O)c(P([O])(=O)O)cc1O. Metal clusters: 2 [Zn]. The MOF has largest included sphere 6.17 A, density 1.13 g/cm3, surface area 3687.07 m2/g, accessible volume 0.60 cm3/g