Al2P3O12 crystallizes in the trigonal R-3 space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(11), one O(2), one O(3), and one O(9) atom to form AlO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and corners with two equivalent P(1)O4 tetrahedra. The Al(1)-O(11) bond length is 1.72 Å. The Al(1)-O(2) bond length is 1.72 Å. The Al(1)-O(3) bond length is 1.70 Å. The Al(1)-O(9) bond length is 1.72 Å. In the second Al site, Al(2) is bonded to one O(10), one O(4), one O(5), and one O(6) atom to form AlO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The Al(2)-O(10) bond length is 1.72 Å. The Al(2)-O(4) bond length is 1.72 Å. The Al(2)-O(5) bond length is 1.74 Å. The Al(2)-O(6) bond length is 1.70 Å. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra and corners with two equivalent Al(1)O4 tetrahedra. The P(1)-O(1) bond length is 1.48 Å. The P(1)-O(2) bond length is 1.54 Å. The P(1)-O(3) bond length is 1.53 Å. The P(1)-O(4) bond length is 1.53 Å. In the second P site, P(2) is bonded to one O(5), one O(6), one O(7), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra and corners with two equivalent Al(2)O4 tetrahedra. The P(2)-O(5) bond length is 1.53 Å. The P(2)-O(6) bond length is 1.52 Å. The P(2)-O(7) bond length is 1.49 Å. The P(2)-O(9) bond length is 1.52 Å. In the third P site, P(3) is bonded to one O(10), one O(11), one O(12), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra and  a cornercorner with one Al(2)O4 tetrahedra. The P(3)-O(10) bond length is 1.56 Å. The P(3)-O(11) bond length is 1.54 Å. The P(3)-O(12) bond length is 1.47 Å. The P(3)-O(8) bond length is 1.51 Å. There are twelve inequivalent O sites. In the first O site, O(7) is bonded in a single-bond geometry to one P(2) atom. In the second O site, O(8) is bonded in a single-bond geometry to one P(3) atom. In the third O site, O(9) is bonded in a bent 150 degrees geometry to one Al(1) and one P(2) atom. In the fourth O site, O(10) is bonded in a bent 150 degrees geometry to one Al(2) and one P(3) atom. In the fifth O site, O(11) is bonded in a bent 150 degrees geometry to one Al(1) and one P(3) atom. In the sixth O site, O(12) is bonded in a single-bond geometry to one P(3) atom. In the seventh O site, O(1) is bonded in a single-bond geometry to one P(1) atom. In the eighth O site, O(2) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1) atom. In the ninth O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1) atom. In the tenth O site, O(4) is bonded in a bent 150 degrees geometry to one Al(2) and one P(1) atom. In the eleventh O site, O(5) is bonded in a bent 150 degrees geometry to one Al(2) and one P(2) atom. In the twelfth O site, O(6) is bonded in a bent 150 degrees geometry to one Al(2) and one P(2) atom. Linkers: 54 [O]P([O])([O])=O. Metal clusters: 36 [Al]. The MOF has largest included sphere 5.54 A, density 1.24 g/cm3, surface area 3447.47 m2/g, accessible volume 0.44 cm3/g