V9P17H26O57 crystallizes in the hexagonal P6_3/m space group. There are three inequivalent V sites. In the first V site, V(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 VO6 octahedra that share  a cornercorner with one P(1)HO3 tetrahedra,  a cornercorner with one P(3)HO3 tetrahedra, and corners with three equivalent P(2)HO3 tetrahedra. The V(1)-O(1) bond length is 2.00 Å. The V(1)-O(2) bond length is 1.97 Å. The V(1)-O(3) bond length is 2.00 Å. The V(1)-O(4) bond length is 1.99 Å. The V(1)-O(5) bond length is 1.96 Å. The V(1)-O(6) bond length is 2.10 Å. In the second V site, V(2) is bonded to six equivalent O(9) atoms to form VO6 octahedra that share corners with six equivalent P(1)HO3 tetrahedra. All V(2)-O(9) bond lengths are 2.01 Å. In the third V site, V(3) is bonded to three equivalent O(7) and three equivalent O(8) atoms to form VO6 octahedra that share corners with three equivalent P(1)HO3 tetrahedra and corners with three equivalent P(4)HO3 tetrahedra. All V(3)-O(7) bond lengths are 1.99 Å. All V(3)-O(8) bond lengths are 2.01 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one H(2), one O(4), one O(8), and one O(9) atom to form distorted PHO3 tetrahedra that share  a cornercorner with one V(1)O6 octahedra,  a cornercorner with one V(2)O6 octahedra, and  a cornercorner with one V(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-46°. The P(1)-H(2) bond length is 1.34 Å. The P(1)-O(4) bond length is 1.52 Å. The P(1)-O(8) bond length is 1.51 Å. The P(1)-O(9) bond length is 1.53 Å. In the second P site, P(2) is bonded to one H(1), one O(1), one O(2), and one O(3) atom to form distorted PHO3 tetrahedra that share corners with three equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-47°. The P(2)-H(1) bond length is 1.34 Å. The P(2)-O(1) bond length is 1.52 Å. The P(2)-O(2) bond length is 1.51 Å. The P(2)-O(3) bond length is 1.52 Å. In the third P site, P(3) is bonded to one H(4) and three equivalent O(5) atoms to form distorted PHO3 tetrahedra that share corners with three equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles are 31°. The P(3)-H(4) bond length is 1.36 Å. All P(3)-O(5) bond lengths are 1.52 Å. In the fourth P site, P(4) is bonded to one H(6), one O(10), and two equivalent O(7) atoms to form distorted PHO3 tetrahedra that share corners with two equivalent V(3)O6 octahedra. The corner-sharing octahedral tilt angles are 39°. The P(4)-H(6) bond length is 1.39 Å. The P(4)-O(10) bond length is 1.53 Å. Both P(4)-O(7) bond lengths are 1.49 Å. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one P(2) atom. In the second H site, H(2) is bonded in a single-bond geometry to one P(1) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(6) atom. The H(3)-O(6) bond length is 0.84 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one P(3) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(10) atom. The H(5)-O(10) bond length is 0.82 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one P(4) atom. There are ten inequivalent O sites. In the first O site, O(10) is bonded in a water-like geometry to one P(4) and one H(5) atom. In the second O site, O(1) is bonded in a distorted bent 120 degrees geometry to one V(1) and one P(2) atom. In the third O site, O(2) is bonded in a distorted bent 150 degrees geometry to one V(1) and one P(2) atom. In the fourth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one V(1) and one P(2) atom. In the fifth O site, O(4) is bonded in a bent 150 degrees geometry to one V(1) and one P(1) atom. In the sixth O site, O(5) is bonded in a bent 150 degrees geometry to one V(1) and one P(3) atom. In the seventh O site, O(6) is bonded in a distorted bent 120 degrees geometry to one V(1) and one H(3) atom. In the eighth O site, O(7) is bonded in a bent 150 degrees geometry to one V(3) and one P(4) atom. In the ninth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one V(3) and one P(1) atom. In the tenth O site, O(9) is bonded in a bent 150 degrees geometry to one V(2) and one P(1) atom. Linkers: 28 [O][PH]([O])=O ,6 [O][PH](=O)O. Metal clusters: 18 [V]. The MOF has largest included sphere 5.97 A, density 1.47 g/cm3, surface area 2803.28 m2/g, accessible volume 0.31 cm3/g