In(C13O4)2 crystallizes in the tetragonal I-42d space group. In(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. All In(1)-O(1) bond lengths are 2.36 Å. All In(1)-O(2) bond lengths are 2.21 Å. There are seven 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 1.28 Å. In the second C site, C(2) is bonded in a 5-coordinate geometry to one C(1), one C(3), one C(4), and two equivalent C(5) atoms. The C(2)-C(3) bond length is 1.51 Å. The C(2)-C(4) bond length is 1.52 Å. There is one shorter (1.56 Å) and one longer (1.62 Å) C(2)-C(5) bond length. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2) and one C(4) atom. The C(3)-C(4) bond length is 1.98 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(2) and one C(3) atom. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(5), one C(6), one C(7), and two equivalent C(2) atoms. The C(5)-C(5) bond length is 0.83 Å. The C(5)-C(6) bond length is 1.53 Å. The C(5)-C(7) bond length is 1.30 Å. In the sixth C site, C(6) is bonded in a single-bond geometry to one C(5) atom. In the seventh C site, C(7) is bonded in a 2-coordinate geometry to two equivalent C(5) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one In(1) and one C(1) atom. In the second O site, O(2) is bonded in an L-shaped geometry to one In(1) and one C(1) atom. Linkers: 8 [C][C](C([C])([C])C([O])=O)C([C])([C])C([C])([C])C([O])=O. Metal clusters: 4 O=[C]O[In](O[C]=O)O[C]=O.[O][C]=O. RCSR code: dia. The MOF has largest included sphere 5.04 A, density 1.07 g/cm3, surface area 3888.78 m2/g, accessible volume 0.57 cm3/g