Zn2CPH2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(2), one O(5), one O(6), and two equivalent O(3) atoms to form distorted ZnO6 octahedra that share corners with two equivalent Zn(1)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, corners with three equivalent Zn(2)O5 trigonal bipyramids, and  an edgeedge with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 53°. The Zn(1)-O(1) bond length is 2.12 Å. The Zn(1)-O(2) bond length is 2.31 Å. The Zn(1)-O(5) bond length is 2.14 Å. The Zn(1)-O(6) bond length is 2.12 Å. There is one shorter (2.01 Å) and one longer (2.13 Å) Zn(1)-O(3) bond length. In the second Zn site, Zn(2) is bonded to one O(1), one O(2), one O(4), one O(6), and one O(7) atom to form distorted ZnO5 trigonal bipyramids that share corners with three equivalent Zn(1)O6 octahedra and corners with three equivalent P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-68°. The Zn(2)-O(1) bond length is 2.15 Å. The Zn(2)-O(2) bond length is 1.96 Å. The Zn(2)-O(4) bond length is 2.01 Å. The Zn(2)-O(6) bond length is 2.38 Å. The Zn(2)-O(7) bond length is 2.00 Å. C(1) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. The C(1)-O(5) bond length is 1.27 Å. The C(1)-O(6) bond length is 1.27 Å. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with two equivalent Zn(1)O6 octahedra, corners with three equivalent Zn(2)O5 trigonal bipyramids, and  an edgeedge with one Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-59°. The P(1)-O(1) bond length is 1.55 Å. The P(1)-O(2) bond length is 1.56 Å. The P(1)-O(3) bond length is 1.56 Å. The P(1)-O(4) bond length is 1.55 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one O(4) and one O(7) atom. The H(1)-O(4) bond length is 1.65 Å. The H(1)-O(7) bond length is 1.01 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(5) and one O(7) atom. The H(2)-O(5) bond length is 1.69 Å. The H(2)-O(7) bond length is 1.00 Å. There are seven inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Zn(1) and one P(1) atom. In the second O site, O(4) is bonded in a trigonal non-coplanar geometry to one Zn(2), one P(1), and one H(1) atom. In the third O site, O(5) is bonded in a 3-coordinate geometry to one Zn(1), one C(1), and one H(2) atom. In the fourth O site, O(6) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(2), and one C(1) atom. In the fifth O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Zn(2), one H(1), and one H(2) atom. In the sixth O site, O(1) is bonded in a trigonal planar geometry to one Zn(1), one Zn(2), and one P(1) atom. In the seventh O site, O(2) is bonded in a 3-coordinate geometry to one Zn(1), one Zn(2), and one P(1) atom. Linkers: 1 [O]C(=O)C([O])=O. Metal clusters: 8 [Zn]. The MOF has largest included sphere 1.41 A, density 3.58 g/cm3, surface area 1672.21 m2/g, accessible volume 0.03 cm3/g