AlC8O5 crystallizes in the triclinic P-1 space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form corner-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles are 46°. Both Al(1)-O(1) bond lengths are 1.80 Å. Both Al(1)-O(3) bond lengths are 1.90 Å. Both Al(1)-O(4) bond lengths are 2.07 Å. In the second Al site, Al(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form corner-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles are 46°. Both Al(2)-O(1) bond lengths are 1.79 Å. Both Al(2)-O(2) bond lengths are 1.98 Å. Both Al(2)-O(5) bond lengths are 2.03 Å. There are eight 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(2), and one O(3) atom. The C(1)-C(2) bond length is 1.50 Å. The C(1)-O(2) bond length is 1.21 Å. The C(1)-O(3) bond length is 1.20 Å. In the second C site, C(2) is bonded in a trigonal non-coplanar geometry to one C(1), one C(3), and one C(4) atom. The C(2)-C(3) bond length is 1.58 Å. The C(2)-C(4) bond length is 1.53 Å. In the third C site, C(3) is bonded in a water-like geometry to one C(2) and one C(4) atom. The C(3)-C(4) bond length is 1.54 Å. In the fourth C site, C(4) is bonded in a bent 120 degrees geometry to one C(2) and one C(3) atom. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(4), and one O(5) atom. The C(5)-C(6) bond length is 1.48 Å. The C(5)-O(4) bond length is 1.26 Å. The C(5)-O(5) bond length is 1.25 Å. In the sixth C site, C(6) is bonded in a trigonal non-coplanar geometry to one C(5), one C(7), and one C(8) atom. The C(6)-C(7) bond length is 1.51 Å. The C(6)-C(8) bond length is 1.51 Å. In the seventh C site, C(7) is bonded in a water-like geometry to one C(6) and one C(8) atom. The C(7)-C(8) bond length is 1.44 Å. In the eighth C site, C(8) is bonded in a distorted bent 150 degrees geometry to one C(6) and one C(7) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Al(1) and one Al(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Al(2) and one C(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one C(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Al(1) and one C(5) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Al(2) and one C(5) atom. Linkers: 2 [O]C(=O)[C]1[C][C][C](C([O])=O)[C][C]1. Metal clusters: 2 [Al]. The MOF has largest included sphere 4.64 A, density 1.27 g/cm3, surface area 3900.10 m2/g, accessible volume 0.28 cm3/g