In(CO2)3 crystallizes in the tetragonal I4_1/a space group. In(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The In(1)-O(1) bond length is 2.14 Å. The In(1)-O(2) bond length is 2.26 Å. The In(1)-O(3) bond length is 2.26 Å. The In(1)-O(4) bond length is 2.28 Å. The In(1)-O(5) bond length is 2.25 Å. The In(1)-O(6) bond length is 2.28 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 O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.27 Å. The C(1)-O(2) bond length is 1.24 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 1.25 Å. The C(2)-O(4) bond length is 1.24 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. The C(3)-O(5) bond length is 1.25 Å. The C(3)-O(6) bond length is 1.25 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one In(1) and one C(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one In(1) and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one In(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one In(1) and one C(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one In(1) and one C(3) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one In(1) and one C(3) atom. Linkers: 23 [O]C(=O)C([O])=O. Metal clusters: 16 [In]. The MOF has largest included sphere 10.34 A, density 1.08 g/cm3, surface area 2659.42 m2/g, accessible volume 0.66 cm3/g