InP2(HO4)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent In sites. In the first In site, In(1) is bonded to one O(1), one O(11), one O(3), one O(4), one O(6), and one O(8) atom to form InO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. The In(1)-O(1) bond length is 2.11 Å. The In(1)-O(11) bond length is 2.16 Å. The In(1)-O(3) bond length is 2.14 Å. The In(1)-O(4) bond length is 2.16 Å. The In(1)-O(6) bond length is 2.14 Å. The In(1)-O(8) bond length is 2.18 Å. In the second In site, In(2) is bonded to two equivalent O(5), two equivalent O(7), and two equivalent O(9) atoms to form InO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. Both In(2)-O(5) bond lengths are 2.15 Å. Both In(2)-O(7) bond lengths are 2.14 Å. Both In(2)-O(9) bond lengths are 2.10 Å. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(11), one O(2), one O(3), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one In(2)O6 octahedra and corners with two equivalent In(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 34-51°. The P(1)-O(11) bond length is 1.53 Å. The P(1)-O(2) bond length is 1.58 Å. The P(1)-O(3) bond length is 1.53 Å. The P(1)-O(7) bond length is 1.52 Å. In the second P site, P(2) is bonded to one O(12), one O(5), one O(6), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one In(2)O6 octahedra and corners with two equivalent In(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-49°. The P(2)-O(12) bond length is 1.58 Å. The P(2)-O(5) bond length is 1.52 Å. The P(2)-O(6) bond length is 1.52 Å. The P(2)-O(8) bond length is 1.53 Å. In the third P site, P(3) is bonded to one O(1), one O(10), one O(4), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one In(2)O6 octahedra and corners with two equivalent In(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-49°. The P(3)-O(1) bond length is 1.52 Å. The P(3)-O(10) bond length is 1.58 Å. The P(3)-O(4) bond length is 1.54 Å. The P(3)-O(9) bond length is 1.53 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(2) atom. The H(1)-O(2) bond length is 0.82 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(10) atom. The H(2)-O(10) bond length is 0.82 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(12) atom. The H(3)-O(12) bond length is 0.82 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one In(1) and one P(3) atom. In the second O site, O(2) is bonded in a water-like geometry to one P(1) and one H(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one In(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one In(1) and one P(3) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one In(2) and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one In(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one In(2) and one P(1) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one In(1) and one P(2) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one In(2) and one P(3) atom. In the tenth O site, O(10) is bonded in a water-like geometry to one P(3) and one H(2) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one In(1) and one P(1) atom. In the twelfth O site, O(12) is bonded in a water-like geometry to one P(2) and one H(3) atom. Linkers: 24 [O]P([O])(=O)O. Metal clusters: 12 [In]. The MOF has largest included sphere 3.97 A, density 2.51 g/cm3, surface area 2210.46 m2/g, accessible volume 0.13 cm3/g