NaCd2(CO3)4 crystallizes in the cubic Im-3m space group. Na(1) is bonded in a square co-planar geometry to four equivalent O(2) atoms. All Na(1)-O(2) bond lengths are 2.40 Å. Cd(1) is bonded to four equivalent O(1) and four equivalent O(2) atoms to form distorted corner-sharing CdO8 hexagonal bipyramids. All Cd(1)-O(1) bond lengths are 2.28 Å. All Cd(1)-O(2) bond lengths are 2.62 Å. C(1) is bonded in a trigonal planar geometry to one O(2) and two equivalent O(1) atoms. The C(1)-O(2) bond length is 1.27 Å. Both C(1)-O(1) bond lengths are 1.29 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Cd(1), and one C(1) atom. In the second O site, O(1) is bonded in a water-like geometry to one Cd(1) and one C(1) atom. Linkers: 24 [O]C([O])=O. Metal clusters: 6 [Na] ,12 [Cd]. RCSR code: nju. The MOF has largest included sphere 9.36 A, density 1.51 g/cm3, surface area 2895.60 m2/g, accessible volume 0.36 cm3/g