SmC9(O2I)3 crystallizes in the cubic P2_13 space group. Sm(1) is bonded in a 3-coordinate geometry to three equivalent O(1) atoms. All Sm(1)-O(1) bond lengths are 2.47 Å. There are three inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.53 Å. The C(1)-O(1) bond length is 1.25 Å. The C(1)-O(2) bond length is 1.24 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1) and two equivalent C(3) atoms. There is one shorter (1.39 Å) and one longer (1.40 Å) C(2)-C(3) bond length. In the third C site, C(3) is bonded in a trigonal planar geometry to two equivalent C(2) and one I(1) atom. The C(3)-I(1) bond length is 2.10 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted L-shaped geometry to one Sm(1) and one C(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one C(1) atom. I(1) is bonded in a single-bond geometry to one C(3) atom. Linkers: 4 [O]C(=O)c1c(I)c(C([O])=O)c(I)c(C([O])=O)c1I. Metal clusters: 4 [C]1O[Sm]23(O1)(O[C]O2)O[C]O3. RCSR code: srs. The MOF has largest included sphere 6.51 A, density 1.73 g/cm3, surface area 2124.13 m2/g, accessible volume 0.36 cm3/g