Al2(CH3PO3)3 crystallizes in the trigonal P31c space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to three equivalent O(1) and three equivalent O(4) atoms to form AlO6 octahedra that share corners with three equivalent P(1)CO3 tetrahedra and corners with three equivalent P(2)CO3 tetrahedra. All Al(1)-O(1) bond lengths are 1.88 Å. All Al(1)-O(4) bond lengths are 1.89 Å. In the second Al site, Al(2) is bonded to one O(2), one O(3), one O(5), and one O(6) atom to form AlO4 tetrahedra that share corners with two equivalent P(1)CO3 tetrahedra and corners with two equivalent P(2)CO3 tetrahedra. The Al(2)-O(2) bond length is 1.75 Å. The Al(2)-O(3) bond length is 1.74 Å. The Al(2)-O(5) bond length is 1.75 Å. The Al(2)-O(6) bond length is 1.75 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted tetrahedral geometry to one P(1), one H(1), one H(2), and one H(3) atom. The C(1)-P(1) bond length is 1.79 Å. The C(1)-H(1) bond length is 1.10 Å. The C(1)-H(2) bond length is 1.10 Å. The C(1)-H(3) bond length is 1.09 Å. In the second C site, C(2) is bonded in a distorted tetrahedral geometry to one P(2), one H(4), one H(5), and one H(6) atom. The C(2)-P(2) bond length is 1.79 Å. The C(2)-H(4) bond length is 1.10 Å. The C(2)-H(5) bond length is 1.10 Å. The C(2)-H(6) bond length is 1.10 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one C(1), one O(1), one O(2), and one O(3) atom to form PCO3 tetrahedra that share  a cornercorner with one Al(1)O6 octahedra and corners with two equivalent Al(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 35°. The P(1)-O(1) bond length is 1.51 Å. The P(1)-O(2) bond length is 1.55 Å. The P(1)-O(3) bond length is 1.55 Å. In the second P site, P(2) is bonded to one C(2), one O(4), one O(5), and one O(6) atom to form PCO3 tetrahedra that share  a cornercorner with one Al(1)O6 octahedra and corners with two equivalent Al(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 20°. The P(2)-O(4) bond length is 1.50 Å. The P(2)-O(5) bond length is 1.55 Å. The P(2)-O(6) bond length is 1.55 Å. There are six inequivalent H sites. In the first H site, H(3) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(4) is bonded in a single-bond geometry to one C(2) atom. In the third H site, H(5) is bonded in a single-bond geometry to one C(2) atom. In the fourth H site, H(6) is bonded in a single-bond geometry to one C(2) atom. In the fifth H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the sixth H site, H(2) is bonded in a single-bond geometry to one C(1) atom. There are six inequivalent O sites. In the first O site, O(6) is bonded in a bent 150 degrees geometry to one Al(2) and one P(2) atom. In the second O site, O(1) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1) atom. In the third O site, O(2) is bonded in a bent 150 degrees geometry to one Al(2) and one P(1) atom. In the fourth O site, O(3) is bonded in a bent 150 degrees geometry to one Al(2) and one P(1) atom. In the fifth O site, O(4) is bonded in a bent 150 degrees geometry to one Al(1) and one P(2) atom. In the sixth O site, O(5) is bonded in a bent 150 degrees geometry to one Al(2) and one P(2) atom. Linkers: 12 CP([O])([O])=O. Metal clusters: 8 [Al]. The MOF has largest included sphere 5.57 A, density 1.54 g/cm3, surface area 3737.88 m2/g, accessible volume 0.23 cm3/g