TlH(CO2)2 is Indium-like structured and crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four TlH(CO2)2 clusters. Tl(1) is bonded in a 1-coordinate geometry to one O(3) atom. The Tl(1)-O(3) bond length is 2.83 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.31 Å. The C(1)-O(2) bond length is 1.23 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(2)-O(3) bond length is 1.28 Å. The C(2)-O(4) bond length is 1.25 Å. H(1) is bonded in a linear geometry to one O(1) and one O(3) atom. The H(1)-O(1) bond length is 1.06 Å. The H(1)-O(3) bond length is 1.45 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one C(1) and one H(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 bent 120 degrees geometry to one Tl(1), one C(2), and one H(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one C(2) atom. Linkers: 2 O=C(O)C(=O)O. Metal clusters: 4 [Tl]. The MOF has largest included sphere 1.93 A, density 4.57 g/cm3, surface area 1261.65 m2/g, accessible volume 0.04 cm3/g