PrC8P2H11O7 crystallizes in the triclinic P-1 space group. Pr(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(4), one O(6), one O(7), and two equivalent O(5) atoms. The Pr(1)-O(1) bond length is 2.49 Å. The Pr(1)-O(2) bond length is 2.33 Å. The Pr(1)-O(4) bond length is 2.32 Å. The Pr(1)-O(6) bond length is 2.57 Å. The Pr(1)-O(7) bond length is 2.42 Å. There is one shorter (2.47 Å) and one longer (2.54 Å) Pr(1)-O(5) bond length. There are eight inequivalent C sites. In the first C site, C(1) is bonded in a distorted water-like geometry to one C(2), one P(1), one H(4), and one H(5) atom. The C(1)-C(2) bond length is 1.50 Å. The C(1)-P(1) bond length is 1.81 Å. The C(1)-H(4) bond length is 1.10 Å. The C(1)-H(5) bond length is 1.10 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(4) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-C(4) bond length is 1.40 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(6) atom. The C(3)-C(4) bond length is 1.39 Å. The C(3)-H(6) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(2), one C(3), and one H(7) atom. The C(4)-H(7) bond length is 1.09 Å. In the fifth C site, C(5) is bonded in a distorted water-like geometry to one C(6), one P(2), one H(8), and one H(9) atom. The C(5)-C(6) bond length is 1.50 Å. The C(5)-P(2) bond length is 1.82 Å. The C(5)-H(8) bond length is 1.10 Å. The C(5)-H(9) bond length is 1.10 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(5), one C(7), and one C(8) atom. The C(6)-C(7) bond length is 1.40 Å. The C(6)-C(8) bond length is 1.40 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(6), one C(8), and one H(10) atom. The C(7)-C(8) bond length is 1.40 Å. The C(7)-H(10) bond length is 1.09 Å. In the eighth C site, C(8) is bonded in a distorted trigonal planar geometry to one C(6), one C(7), and one H(11) atom. The C(8)-H(11) bond length is 1.09 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one C(1), one O(2), one O(3), and one O(4) atom. The P(1)-O(2) bond length is 1.51 Å. The P(1)-O(3) bond length is 1.61 Å. The P(1)-O(4) bond length is 1.52 Å. In the second P site, P(2) is bonded in a distorted tetrahedral geometry to one C(5), one O(5), one O(6), and one O(7) atom. The P(2)-O(5) bond length is 1.56 Å. The P(2)-O(6) bond length is 1.55 Å. The P(2)-O(7) bond length is 1.54 Å. There are eleven inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. The H(1)-O(1) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) atom. The H(2)-O(1) bond length is 1.00 Å. In the third H site, H(3) is bonded in a linear geometry to one O(3) and one O(7) atom. The H(3)-O(3) bond length is 1.02 Å. The H(3)-O(7) bond length is 1.60 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(1) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(1) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(3) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(4) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(5) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(5) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(7) atom. In the eleventh H site, H(11) is bonded in a single-bond geometry to one C(8) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Pr(1), one H(1), and one H(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Pr(1) 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(3) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Pr(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Pr(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Pr(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Pr(1), one P(2), and one H(3) atom. Linkers: 1 [O]P([O])(=O)Cc1ccc(CP([O])([O])=O)cc1 ,1 [O]P(=O)(O)Cc1ccc(CP([O])(=O)O)cc1. Metal clusters: 2 [Pr]. The MOF has largest included sphere 1.97 A, density 2.41 g/cm3, surface area 2887.76 m2/g, accessible volume 0.09 cm3/g