In2P5H7O15 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent In sites. In the first In site, In(1) is bonded to one O(1), one O(10), one O(11), one O(12), one O(2), and one O(5) atom to form InO6 octahedra that share  a cornercorner with one P(2)HO3 tetrahedra,  a cornercorner with one P(3)HO3 tetrahedra,  a cornercorner with one P(4)HO3 tetrahedra,  a cornercorner with one P(5)HO3 tetrahedra, and corners with two equivalent P(1)HO3 tetrahedra. The In(1)-O(1) bond length is 2.12 Å. The In(1)-O(10) bond length is 2.10 Å. The In(1)-O(11) bond length is 2.13 Å. The In(1)-O(12) bond length is 2.14 Å. The In(1)-O(2) bond length is 2.16 Å. The In(1)-O(5) bond length is 2.17 Å. In the second In site, In(2) is bonded to one O(13), one O(3), one O(6), one O(7), one O(8), and one O(9) atom to form InO6 octahedra that share  a cornercorner with one P(1)HO3 tetrahedra,  a cornercorner with one P(2)HO3 tetrahedra,  a cornercorner with one P(3)HO3 tetrahedra,  a cornercorner with one P(5)HO3 tetrahedra, and corners with two equivalent P(4)HO3 tetrahedra. The In(2)-O(13) bond length is 2.11 Å. The In(2)-O(3) bond length is 2.15 Å. The In(2)-O(6) bond length is 2.13 Å. The In(2)-O(7) bond length is 2.13 Å. The In(2)-O(8) bond length is 2.14 Å. The In(2)-O(9) bond length is 2.11 Å. There are five inequivalent P sites. In the first P site, P(1) is bonded to one H(3), one O(10), one O(5), and one O(9) atom to form distorted PHO3 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 32-53°. The P(1)-H(3) bond length is 1.37 Å. The P(1)-O(10) bond length is 1.52 Å. The P(1)-O(5) bond length is 1.55 Å. The P(1)-O(9) bond length is 1.52 Å. In the second P site, P(2) is bonded to one H(7), one O(12), one O(13), and one O(15) atom to form distorted PHO3 tetrahedra that share  a cornercorner with one In(1)O6 octahedra and  a cornercorner with one In(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-44°. The P(2)-H(7) bond length is 1.43 Å. The P(2)-O(12) bond length is 1.50 Å. The P(2)-O(13) bond length is 1.48 Å. The P(2)-O(15) bond length is 1.52 Å. In the third P site, P(3) is bonded to one H(1), one O(2), one O(4), and one O(6) atom to form PHO3 tetrahedra that share  a cornercorner with one In(1)O6 octahedra and  a cornercorner with one In(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-52°. The P(3)-H(1) bond length is 1.35 Å. The P(3)-O(2) bond length is 1.53 Å. The P(3)-O(4) bond length is 1.52 Å. The P(3)-O(6) bond length is 1.51 Å. In the fourth P site, P(4) is bonded to one H(2), one O(1), one O(3), and one O(8) atom to form PHO3 tetrahedra that share  a cornercorner with one In(1)O6 octahedra and corners with two equivalent In(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-48°. The P(4)-H(2) bond length is 1.32 Å. The P(4)-O(1) bond length is 1.52 Å. The P(4)-O(3) bond length is 1.52 Å. The P(4)-O(8) bond length is 1.53 Å. In the fifth P site, P(5) is bonded to one H(4), one O(11), one O(14), and one O(7) atom to form distorted PHO3 tetrahedra that share  a cornercorner with one In(1)O6 octahedra and  a cornercorner with one In(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 19-40°. The P(5)-H(4) bond length is 1.39 Å. The P(5)-O(11) bond length is 1.50 Å. The P(5)-O(14) bond length is 1.53 Å. The P(5)-O(7) bond length is 1.51 Å. There are seven inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one P(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one P(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one P(1) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one P(5) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(14) atom. The H(5)-O(14) bond length is 0.82 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(15) atom. The H(6)-O(15) bond length is 0.82 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one P(2) atom. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one In(1) and one P(4) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one In(1) and one P(3) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one In(2) and one P(4) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one P(3) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one In(1) and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one In(2) and one P(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one In(2) and one P(5) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one In(2) and one P(4) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one In(2) and one P(1) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one In(1) and one P(1) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one In(1) and one P(5) atom. In the twelfth O site, O(12) is bonded in a distorted bent 150 degrees geometry to one In(1) and one P(2) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one In(2) and one P(2) atom. In the fourteenth O site, O(14) is bonded in a water-like geometry to one P(5) and one H(5) atom. In the fifteenth O site, O(15) is bonded in a water-like geometry to one P(2) and one H(6) atom. Linkers: 8 [O][PH](=O)O ,12 [O][PH]([O])=O. Metal clusters: 8 [In]. The MOF has largest included sphere 4.15 A, density 2.29 g/cm3, surface area 2606.84 m2/g, accessible volume 0.16 cm3/g