Hf3C12H4(SO6)2 crystallizes in the cubic Fm-3m space group. There are two inequivalent Hf sites. In the first Hf site, Hf(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. Both Hf(1)-O(1) bond lengths are 2.26 Å. Both Hf(1)-O(3) bond lengths are 2.12 Å. Both Hf(1)-O(4) bond lengths are 2.12 Å. In the second Hf site, Hf(2) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), and four equivalent O(2) atoms. Both Hf(2)-O(3) bond lengths are 2.18 Å. Both Hf(2)-O(4) bond lengths are 2.13 Å. All Hf(2)-O(2) bond lengths are 2.20 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 1.49 Å. The C(1)-O(1) bond length is 1.26 Å. The C(1)-O(2) bond length is 1.27 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one S(1) atom. The C(2)-C(3) bond length is 1.35 Å. The C(2)-S(1) bond length is 1.71 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2) and one H(1) atom. The C(3)-H(1) bond length is 0.93 Å. H(1) is bonded in a single-bond geometry to one C(3) atom. S(1) is bonded in an L-shaped geometry to two equivalent C(2) atoms. There are four inequivalent O sites. In the first O site, O(4) is bonded in a trigonal non-coplanar geometry to one Hf(2) and two equivalent Hf(1) atoms. In the second O site, O(1) is bonded in a 2-coordinate geometry to one Hf(1) and one C(1) atom. In the third O site, O(2) is bonded in a bent 120 degrees geometry to one Hf(2) and one C(1) atom. In the fourth O site, O(3) is bonded in a trigonal non-coplanar geometry to one Hf(2) and two equivalent Hf(1) atoms. Linkers: 24 [O]C(=O)c1ccc(C([O])=O)s1. Metal clusters: 3 O=[C]O[Hf]1234O[C]O[Hf]5O[C]O[Hf]67(O[C]O[Hf]8O[C]O[Hf]9(O[C]O5)(O6)(O7)O[Hf](O[C]=O)(O[C]O8)(O9)(O1)O2)(O3)O4 ,1 O=[C]O[Hf]1234O[C]O[Hf]5O[C]O[Hf]67(O[C]O[Hf]8O[C]O[Hf]9(O[C]O5)(O1)(O2)O[Hf](O[C]=O)(O[C]O8)(O6)(O7)O9)(O3)O4 ,2 O=[C]O[Hf]123(O[C]=O)O[Hf]456(O[C]O[Hf]7O[C]O[Hf]89(O[C]O[Hf](O[C]O4)O[C]O[Hf](O[C]O7)(O8)(O9)(O1)O2)(O5)O6)O3. RCSR code: reo. The MOF has largest included sphere 19.52 A, density 1.26 g/cm3, surface area 1860.05 m2/g, accessible volume 0.59 cm3/g