TlTlC5HO4 is Indium-like structured and crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four 7440-28-0 atoms and two TlC5HO4 clusters. In each TlC5HO4 cluster, Tl(1) is bonded in a distorted single-bond geometry to one O(1) atom. The Tl(1)-O(1) bond length is 2.74 Å. There are five 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 1.51 Å. The C(1)-O(1) bond length is 1.28 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 C(5) atom. The C(2)-C(3) bond length is 1.41 Å. The C(2)-C(5) bond length is 1.40 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(5) atom. The C(3)-C(4) bond length is 1.51 Å. The C(3)-C(5) bond length is 1.40 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(3), and one O(4) atom. The C(4)-O(3) bond length is 1.28 Å. The C(4)-O(4) bond length is 1.27 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(2), one C(3), and one H(1) atom. The C(5)-H(1) bond length is 1.09 Å. H(1) is bonded in a single-bond geometry to one C(5) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Tl(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. In the third O site, O(3) is bonded in a single-bond geometry to one C(4) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one C(4) atom. Linkers: 2 [O]C(=O)c1cc(C([O])=O)c(C([O])=O)cc1C([O])=O. Metal clusters: 8 [Tl]. The MOF has largest included sphere 1.90 A, density 4.98 g/cm3, surface area 1094.75 m2/g, accessible volume 0.02 cm3/g