CdP2H14(CO)8 crystallizes in the monoclinic C2/c space group. Cd(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form CdO6 octahedra that share corners with four equivalent P(1)CO3 tetrahedra. Both Cd(1)-O(2) bond lengths are 2.31 Å. Both Cd(1)-O(3) bond lengths are 2.39 Å. Both Cd(1)-O(4) bond lengths are 2.31 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(3), and one P(1) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(3) bond length is 1.41 Å. The C(1)-P(1) bond length is 1.81 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(4) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-H(4) bond length is 1.09 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(1), one C(2), and one C(4) atom. The C(3)-C(4) bond length is 1.50 Å. In the fourth C site, C(4) is bonded in a distorted trigonal non-coplanar geometry to one C(3), one H(5), one H(6), and one H(7) atom. The C(4)-H(5) bond length is 1.10 Å. The C(4)-H(6) bond length is 1.10 Å. The C(4)-H(7) bond length is 1.10 Å. P(1) is bonded to one C(1), one O(1), one O(3), and one O(4) atom to form PCO3 tetrahedra that share corners with two equivalent Cd(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. The P(1)-O(1) bond length is 1.60 Å. The P(1)-O(3) bond length is 1.53 Å. The P(1)-O(4) bond length is 1.53 Å. There are seven inequivalent H sites. In the first H site, H(6) is bonded in a single-bond geometry to one C(4) atom. In the second H site, H(7) is bonded in a single-bond geometry to one C(4) atom. In the third H site, H(1) is bonded in a distorted linear geometry to one O(1) and one O(3) atom. The H(1)-O(1) bond length is 1.03 Å. The H(1)-O(3) bond length is 1.53 Å. In the fourth H site, H(2) is bonded in a single-bond geometry to one O(2) atom. The H(2)-O(2) bond length is 1.00 Å. In the fifth H site, H(3) is bonded in a single-bond geometry to one O(2) atom. The H(3)-O(2) bond length is 0.99 Å. In the sixth H site, H(4) is bonded in a single-bond geometry to one C(2) atom. In the seventh H site, H(5) is bonded in a single-bond geometry to one C(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one P(1) and one H(1) atom. In the second O site, O(2) is bonded in a distorted water-like geometry to one Cd(1), one H(2), and one H(3) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Cd(1), one P(1), and one H(1) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Cd(1) and one P(1) atom. Linkers: 2 Cc1cc(P([O])(=O)O)c(C)cc1P([O])(=O)O. Metal clusters: 2 [Cd]. The MOF has largest included sphere 2.19 A, density 2.18 g/cm3, surface area 3068.03 m2/g, accessible volume 0.09 cm3/g