Al(C3O2)2 crystallizes in the trigonal R-3m space group. Al(1) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(3) atoms to form edge-sharing AlO6 octahedra. The Al(1)-O(1) bond length is 1.97 Å. The Al(1)-O(2) bond length is 1.99 Å. The Al(1)-O(4) bond length is 1.92 Å. The Al(1)-O(5) bond length is 1.90 Å. There is one shorter (1.83 Å) and one longer (1.90 Å) Al(1)-O(3) bond length. There are nine inequivalent C sites. In the first C site, C(8) is bonded in a distorted bent 150 degrees geometry to one C(9) and two equivalent O(2) atoms. The C(8)-C(9) bond length is 1.54 Å. Both C(8)-O(2) bond lengths are 1.24 Å. In the second C site, C(9) is bonded in a trigonal planar geometry to one C(8) and two equivalent C(2) atoms. Both C(9)-C(2) bond lengths are 1.38 Å. In the third C site, C(1) is bonded in a bent 120 degrees geometry to one C(1) and one C(5) atom. The C(1)-C(1) bond length is 1.40 Å. The C(1)-C(5) bond length is 1.40 Å. In the fourth C site, C(2) is bonded in a bent 120 degrees geometry to one C(2) and one C(9) atom. The C(2)-C(2) bond length is 1.39 Å. In the fifth C site, C(3) is bonded in a single-bond geometry to one O(3) atom. The C(3)-O(3) bond length is 1.47 Å. In the sixth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(5) and two equivalent O(1) atoms. The C(4)-C(5) bond length is 1.54 Å. Both C(4)-O(1) bond lengths are 1.23 Å. In the seventh C site, C(5) is bonded in a trigonal planar geometry to one C(4) and two equivalent C(1) atoms. In the eighth C site, C(6) is bonded in a single-bond geometry to one O(4) atom. The C(6)-O(4) bond length is 1.47 Å. In the ninth C site, C(7) is bonded in a single-bond geometry to one O(5) atom. The C(7)-O(5) bond length is 1.52 Å. There are five inequivalent O sites. In the first O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Al(1) and one C(6) atom. In the second O site, O(5) is bonded in a distorted trigonal planar geometry to two equivalent Al(1) and one C(7) atom. In the third O site, O(1) is bonded in a bent 120 degrees geometry to one Al(1) and one C(4) atom. In the fourth O site, O(2) is bonded in a bent 120 degrees geometry to one Al(1) and one C(8) atom. In the fifth O site, O(3) is bonded in a trigonal planar geometry to two equivalent Al(1) and one C(3) atom. Linkers: 18 [O]C(=O)c1[c][c]c(C([O])=O)[c][c]1. Metal clusters: 36 [Al]. The MOF has largest included sphere 10.47 A, density 0.72 g/cm3, surface area 4485.86 m2/g, accessible volume 1.02 cm3/g