AlC8O5 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form corner-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles range from 51-59°. The Al(1)-O(1) bond length is 1.87 Å. The Al(1)-O(2) bond length is 1.92 Å. The Al(1)-O(3) bond length is 1.92 Å. The Al(1)-O(4) bond length is 1.86 Å. The Al(1)-O(5) bond length is 1.93 Å. The Al(1)-O(6) bond length is 1.86 Å. In the second Al site, Al(2) is bonded to one O(1), one O(10), one O(6), one O(7), one O(8), and one O(9) atom to form corner-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles range from 51-59°. The Al(2)-O(1) bond length is 1.86 Å. The Al(2)-O(10) bond length is 1.99 Å. The Al(2)-O(6) bond length is 1.85 Å. The Al(2)-O(7) bond length is 1.89 Å. The Al(2)-O(8) bond length is 1.87 Å. The Al(2)-O(9) bond length is 1.92 Å. There are sixteen inequivalent C sites. In the first C site, C(1) is bonded in a bent 120 degrees geometry to one C(2) and one C(5) atom. The C(1)-C(2) bond length is 1.52 Å. The C(1)-C(5) bond length is 1.50 Å. In the second C site, C(2) is bonded in a bent 120 degrees geometry to one C(1) and one C(6) atom. The C(2)-C(6) bond length is 1.52 Å. In the third C site, C(3) is bonded in a bent 120 degrees geometry to one C(4) and one C(6) atom. The C(3)-C(4) bond length is 1.54 Å. The C(3)-C(6) bond length is 1.52 Å. In the fourth C site, C(4) is bonded in a bent 120 degrees geometry to one C(3) and one C(5) atom. The C(4)-C(5) bond length is 1.52 Å. In the fifth C site, C(5) is bonded in a trigonal non-coplanar geometry to one C(1), one C(4), and one C(7) atom. The C(5)-C(7) bond length is 1.51 Å. In the sixth C site, C(6) is bonded in a trigonal non-coplanar geometry to one C(2), one C(3), and one C(8) atom. The C(6)-C(8) bond length is 1.51 Å. In the seventh C site, C(7) is bonded in a bent 120 degrees geometry to one C(5), one O(10), and one O(2) atom. The C(7)-O(10) bond length is 1.30 Å. The C(7)-O(2) bond length is 1.26 Å. In the eighth C site, C(8) is bonded in a bent 120 degrees geometry to one C(6), one O(4), and one O(8) atom. The C(8)-O(4) bond length is 1.17 Å. The C(8)-O(8) bond length is 1.29 Å. In the ninth C site, C(9) is bonded in a bent 120 degrees geometry to one C(10) and one C(13) atom. The C(9)-C(10) bond length is 1.54 Å. The C(9)-C(13) bond length is 1.52 Å. In the tenth C site, C(10) is bonded in a bent 120 degrees geometry to one C(14) and one C(9) atom. The C(10)-C(14) bond length is 1.52 Å. In the eleventh C site, C(11) is bonded in a bent 120 degrees geometry to one C(12) and one C(14) atom. The C(11)-C(12) bond length is 1.52 Å. The C(11)-C(14) bond length is 1.52 Å. In the twelfth C site, C(12) is bonded in a bent 120 degrees geometry to one C(11) and one C(13) atom. The C(12)-C(13) bond length is 1.50 Å. In the thirteenth C site, C(13) is bonded in a trigonal non-coplanar geometry to one C(12), one C(15), and one C(9) atom. The C(13)-C(15) bond length is 1.51 Å. In the fourteenth C site, C(14) is bonded in a trigonal non-coplanar geometry to one C(10), one C(11), and one C(16) atom. The C(14)-C(16) bond length is 1.51 Å. In the fifteenth C site, C(15) is bonded in a distorted bent 120 degrees geometry to one C(13), one O(5), and one O(7) atom. The C(15)-O(5) bond length is 1.23 Å. The C(15)-O(7) bond length is 1.26 Å. In the sixteenth C site, C(16) is bonded in a 2-coordinate geometry to one C(14), one O(3), and one O(9) atom. The C(16)-O(3) bond length is 1.27 Å. The C(16)-O(9) bond length is 1.29 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Al(1) and one Al(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Al(1) and one C(7) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Al(1) and one C(16) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Al(1) and one C(8) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Al(1) and one C(15) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Al(1) and one Al(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Al(2) and one C(15) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Al(2) and one C(8) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Al(2) and one C(16) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Al(2) and one C(7) atom. Linkers: 4 [O]C(=O)[C]1[C][C][C](C([O])=O)[C][C]1. Metal clusters: 4 [Al]. The MOF has largest included sphere 5.73 A, density 1.04 g/cm3, surface area 4121.22 m2/g, accessible volume 0.54 cm3/g