Sr3P8H22(C4O15)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(4), one O(5), one O(7), one O(8), and one O(9) atom. The Sr(1)-O(1) bond length is 2.64 Å. The Sr(1)-O(12) bond length is 2.65 Å. The Sr(1)-O(4) bond length is 2.61 Å. The Sr(1)-O(5) bond length is 2.75 Å. The Sr(1)-O(7) bond length is 2.49 Å. The Sr(1)-O(8) bond length is 2.63 Å. The Sr(1)-O(9) bond length is 2.91 Å. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. Both Sr(2)-O(1) bond lengths are 2.55 Å. Both Sr(2)-O(2) bond lengths are 2.47 Å. Both Sr(2)-O(4) bond lengths are 2.53 Å. Both Sr(2)-O(5) bond lengths are 2.53 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted tetrahedral geometry to one C(2), one P(1), one P(2), and one O(13) atom. The C(1)-C(2) bond length is 1.53 Å. The C(1)-P(1) bond length is 1.83 Å. The C(1)-P(2) bond length is 1.83 Å. The C(1)-O(13) bond length is 1.44 Å. In the second C site, C(2) is bonded in a trigonal non-coplanar geometry to one C(1), one H(1), one H(2), and one H(3) atom. The C(2)-H(1) bond length is 0.96 Å. The C(2)-H(2) bond length is 0.96 Å. The C(2)-H(3) bond length is 0.96 Å. In the third C site, C(3) is bonded in a distorted tetrahedral geometry to one C(4), one P(3), one P(4), and one O(9) atom. The C(3)-C(4) bond length is 1.53 Å. The C(3)-P(3) bond length is 1.83 Å. The C(3)-P(4) bond length is 1.82 Å. The C(3)-O(9) bond length is 1.46 Å. In the fourth C site, C(4) is bonded in a trigonal non-coplanar geometry to one C(3); one H(7); and two equivalent H(5,6) atoms. The C(4)-H(7) bond length is 0.96 Å. Both C(4)-H(5,6) bond lengths are 0.96 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one C(1), one O(1), one O(2), and one O(3) atom to form distorted corner-sharing PCO3 tetrahedra. The P(1)-O(1) bond length is 1.51 Å. The P(1)-O(2) bond length is 1.50 Å. The P(1)-O(3) bond length is 1.57 Å. In the second P site, P(2) is bonded to one C(1), one O(4), one O(5), and one O(6) atom to form corner-sharing PCO3 tetrahedra. The P(2)-O(4) bond length is 1.51 Å. The P(2)-O(5) bond length is 1.50 Å. The P(2)-O(6) bond length is 1.57 Å. In the third P site, P(3) is bonded in a distorted tetrahedral geometry to one C(3), one O(10), one O(12), and one O(8) atom. The P(3)-O(10) bond length is 1.56 Å. The P(3)-O(12) bond length is 1.51 Å. The P(3)-O(8) bond length is 1.50 Å. In the fourth P site, P(4) is bonded in a 5-coordinate geometry to one C(3), one O(11), one O(14), one O(15), and one O(7) atom. The P(4)-O(11) bond length is 1.55 Å. The P(4)-O(14) bond length is 1.50 Å. The P(4)-O(15) bond length is 1.49 Å. The P(4)-O(7) bond length is 1.48 Å. There are ten inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(2) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(3) atom. The H(4)-O(3) bond length is 0.85 Å. In the fifth H site, H(5,6) is bonded in a single-bond geometry to one C(4) atom. In the sixth H site, H(7) is bonded in a single-bond geometry to one C(4) atom. In the seventh H site, H(8) is bonded in a single-bond geometry to one O(9) atom. The H(8)-O(9) bond length is 0.82 Å. In the eighth H site, H(9) is bonded in a single-bond geometry to one O(10) atom. The H(9)-O(10) bond length is 0.82 Å. In the ninth H site, H(10) is bonded in a single-bond geometry to one O(11) atom. The H(10)-O(11) bond length is 0.82 Å. In the tenth H site, H(11) is bonded in a single-bond geometry to one O(13) atom. The H(11)-O(13) bond length is 0.85 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Sr(2) and one P(1) atom. In the third O site, O(3) is bonded in a water-like geometry to one P(1) and one H(4) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one P(2) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one P(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Sr(1) and one P(4) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Sr(1) and one P(3) atom. In the ninth O site, O(9) is bonded in a distorted water-like geometry to one Sr(1), one C(3), and one H(8) atom. In the tenth O site, O(11) is bonded in a water-like geometry to one P(4) and one H(10) atom. In the eleventh O site, O(12) is bonded in a distorted single-bond geometry to one Sr(1) and one P(3) atom. In the twelfth O site, O(13) is bonded in a water-like geometry to one C(1) and one H(11) atom. In the thirteenth O site, O(14) is bonded in a 2-coordinate geometry to one P(4) and one O(15) atom. The O(14)-O(15) bond length is 0.89 Å. In the fourteenth O site, O(15) is bonded in a 2-coordinate geometry to one P(4) and one O(14) atom. In the fifteenth O site, O(10) is bonded in a water-like geometry to one P(3) and one H(9) atom. Linkers: 8 CC(O)(P([O])([O])=O)P([O])(=O)O. Metal clusters: 12 [Sr]. The MOF has largest included sphere 3.92 A, density 1.99 g/cm3, surface area 2861.56 m2/g, accessible volume 0.16 cm3/g