CdCPHO6 crystallizes in the monoclinic P2_1/c space group. Cd(1) is bonded to one O(1), one O(2), one O(3), one O(5), and one O(6) atom to form CdO5 square pyramids that share corners with three equivalent P(1)O4 tetrahedra. The Cd(1)-O(1) bond length is 2.19 Å. The Cd(1)-O(2) bond length is 2.23 Å. The Cd(1)-O(3) bond length is 2.32 Å. The Cd(1)-O(5) bond length is 2.31 Å. The Cd(1)-O(6) bond length is 2.31 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 1.25 Å. The C(1)-O(6) bond length is 1.25 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 three equivalent Cd(1)O5 square pyramids. The P(1)-O(1) bond length is 1.52 Å. The P(1)-O(2) bond length is 1.51 Å. The P(1)-O(3) bond length is 1.51 Å. The P(1)-O(4) bond length is 1.59 Å. H(1) is bonded in a single-bond geometry to one O(4) atom. The H(1)-O(4) bond length is 0.82 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Cd(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Cd(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a water-like geometry to one P(1) and one H(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one C(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one C(1) atom. Linkers: 2 [O]C(=O)C([O])=O. Metal clusters: 4 [Cd]. The MOF has largest included sphere 5.06 A, density 1.94 g/cm3, surface area 2689.41 m2/g, accessible volume 0.28 cm3/g