Al2P3O12 crystallizes in the monoclinic C2/c space group. Al(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form AlO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with three equivalent P(1)O4 tetrahedra. The Al(1)-O(1) bond length is 1.73 Å. The Al(1)-O(2) bond length is 1.76 Å. The Al(1)-O(3) bond length is 1.72 Å. The Al(1)-O(5) bond length is 1.76 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form PO4 tetrahedra that share corners with three equivalent Al(1)O4 tetrahedra. The P(1)-O(1) bond length is 1.54 Å. The P(1)-O(2) bond length is 1.56 Å. The P(1)-O(4) bond length is 1.48 Å. The P(1)-O(5) bond length is 1.56 Å. In the second P site, P(2) is bonded to two equivalent O(3) and two equivalent O(6) atoms to form PO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra. Both P(2)-O(3) bond lengths are 1.54 Å. Both P(2)-O(6) bond lengths are 1.51 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Al(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one P(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Al(1) and one P(1) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one P(2) atom. Linkers: 12 [O]P([O])([O])=O. Metal clusters: 8 [Al]. The MOF has largest included sphere 3.76 A, density 1.50 g/cm3, surface area 3446.01 m2/g, accessible volume 0.34 cm3/g