Al3C16N2O15 crystallizes in the monoclinic C2/c space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one N(1), one O(1), one O(3), and two equivalent O(7) atoms to form edge-sharing AlNO4 square pyramids. The Al(1)-N(1) bond length is 1.96 Å. The Al(1)-O(1) bond length is 1.92 Å. The Al(1)-O(3) bond length is 1.99 Å. There is one shorter (1.82 Å) and one longer (1.83 Å) Al(1)-O(7) bond length. In the second Al site, Al(2) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(8) atoms to form corner-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles are 57°. Both Al(2)-O(5) bond lengths are 1.93 Å. Both Al(2)-O(6) bond lengths are 1.92 Å. Both Al(2)-O(8) bond lengths are 1.85 Å. There are eight inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 150 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 1.25 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(3) and one N(1) atom. The C(2)-C(3) bond length is 1.44 Å. The C(2)-N(1) bond length is 1.33 Å. In the third C site, C(3) is bonded in a bent 120 degrees geometry to one C(2) and one C(4) atom. The C(3)-C(4) bond length is 1.39 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(8) atom. The C(4)-C(5) bond length is 1.41 Å. The C(4)-C(8) bond length is 1.54 Å. In the fifth C site, C(5) is bonded in a bent 120 degrees geometry to one C(4) and one C(6) atom. The C(5)-C(6) bond length is 1.41 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(5), one C(7), and one N(1) atom. The C(6)-C(7) bond length is 1.53 Å. The C(6)-N(1) bond length is 1.37 Å. In the seventh C site, C(7) is bonded in a bent 120 degrees geometry to one C(6), one O(3), and one O(4) atom. The C(7)-O(3) bond length is 1.33 Å. The C(7)-O(4) bond length is 1.26 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(5), and one O(6) atom. The C(8)-O(5) bond length is 1.30 Å. The C(8)-O(6) bond length is 1.29 Å. N(1) is bonded in a trigonal planar geometry to one Al(1), one C(2), and one C(6) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Al(1) and one C(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one C(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Al(1) and one C(7) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one C(7) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Al(2) and one C(8) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Al(2) and one C(8) atom. In the seventh O site, O(7) is bonded in an L-shaped geometry to two equivalent Al(1) atoms. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to two equivalent Al(2) atoms. Linkers: 8 [O]C(=O)c1[c]c(C([O])=O)nc(C([O])=O)[c]1. Metal clusters: 12 [Al]. The MOF has largest included sphere 6.29 A, density 1.37 g/cm3, surface area 3828.36 m2/g, accessible volume 0.26 cm3/g