In3P8(H6O11)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(11), one O(2), one O(3), one O(4), one O(7), and one O(9) atom to form InO6 octahedra that share corners with two equivalent P(1)HO3 tetrahedra, corners with two equivalent P(2)HO3 tetrahedra, and corners with two equivalent P(4)HO3 tetrahedra. The In(1)-O(11) bond length is 2.13 Å. The In(1)-O(2) bond length is 2.14 Å. The In(1)-O(3) bond length is 2.13 Å. The In(1)-O(4) bond length is 2.15 Å. The In(1)-O(7) bond length is 2.13 Å. The In(1)-O(9) bond length is 2.11 Å. In the second In site, In(2) is bonded to two equivalent O(1), two equivalent O(10), and two equivalent O(8) atoms to form InO6 octahedra that share corners with two equivalent P(1)HO3 tetrahedra and corners with two equivalent P(2)HO3 tetrahedra. Both In(2)-O(1) bond lengths are 2.13 Å. Both In(2)-O(10) bond lengths are 2.11 Å. Both In(2)-O(8) bond lengths are 2.13 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one H(5), one O(2), one O(4), and one O(8) 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 40-47°. The P(1)-H(5) bond length is 1.33 Å. The P(1)-O(2) bond length is 1.52 Å. The P(1)-O(4) bond length is 1.52 Å. The P(1)-O(8) bond length is 1.52 Å. In the second P site, P(2) is bonded to one H(4), one O(10), one O(3), 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 40-46°. The P(2)-H(4) bond length is 1.35 Å. The P(2)-O(10) bond length is 1.51 Å. The P(2)-O(3) bond length is 1.53 Å. The P(2)-O(9) bond length is 1.52 Å. In the third P site, P(3) is bonded in a 5-coordinate geometry to one P(3), one H(6), one O(5), and two equivalent O(1) atoms. The P(3)-P(3) bond length is 1.33 Å. The P(3)-H(6) bond length is 1.37 Å. The P(3)-O(5) bond length is 1.57 Å. There is one shorter (1.38 Å) and one longer (1.42 Å) P(3)-O(1) bond length. In the fourth P site, P(4) is bonded to one H(3), one O(11), one O(6), and one O(7) atom to form distorted PHO3 tetrahedra that share corners with two equivalent In(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-37°. The P(4)-H(3) bond length is 1.31 Å. The P(4)-O(11) bond length is 1.49 Å. The P(4)-O(6) bond length is 1.54 Å. The P(4)-O(7) bond length is 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 O(5) atom. The H(1)-O(5) bond length is 0.82 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(6) atom. The H(2)-O(6) bond length is 0.82 Å. In the third H site, H(3) is bonded in a single-bond geometry to one P(4) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one P(2) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one P(1) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one P(3) atom. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one In(2) and two equivalent P(3) atoms. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one In(1) and one P(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(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one In(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one P(3) and one H(1) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one P(4) and one H(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one In(1) and one P(4) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one In(2) and one P(1) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one In(1) and one P(2) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one In(2) and one P(2) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one In(1) and one P(4) atom. Linkers: 2 O[PH]12O[PH]1(O)O2. Metal clusters: 12 [In]. The MOF has largest included sphere 5.19 A, density 2.51 g/cm3, surface area 2280.32 m2/g, accessible volume 0.15 cm3/g