Pr2Ru4C8P8H34O37(H2O)3 crystallizes in the triclinic P1 space group. The structure consists of three water molecules inside a Pr2Ru4C8P8H34O37 framework. In the Pr2Ru4C8P8H34O37 framework, there are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 8-coordinate geometry to one O(10), one O(21), one O(22), one O(33), one O(34), one O(37), one O(38), and one O(9) atom. The Pr(1)-O(10) bond length is 2.42 Å. The Pr(1)-O(21) bond length is 2.38 Å. The Pr(1)-O(22) bond length is 2.38 Å. The Pr(1)-O(33) bond length is 2.54 Å. The Pr(1)-O(34) bond length is 2.54 Å. The Pr(1)-O(37) bond length is 2.60 Å. The Pr(1)-O(38) bond length is 2.60 Å. The Pr(1)-O(9) bond length is 2.42 Å. In the second Pr site, Pr(2) is bonded in a 8-coordinate geometry to one O(23); one O(24); two equivalent O(11,12); two equivalent O(35,36); and two equivalent O(39,40) atoms. The Pr(2)-O(23) bond length is 2.38 Å. The Pr(2)-O(24) bond length is 2.38 Å. Both Pr(2)-O(11,12) bond lengths are 2.42 Å. Both Pr(2)-O(35,36) bond lengths are 2.54 Å. Both Pr(2)-O(39,40) bond lengths are 2.60 Å. There are three inequivalent Ru sites. In the first Ru site, Ru(1) is bonded in a 5-coordinate geometry to one O(1), one O(13), one O(19), one O(29), and one O(7) atom. The Ru(1)-O(1) bond length is 2.04 Å. The Ru(1)-O(13) bond length is 2.05 Å. The Ru(1)-O(19) bond length is 2.03 Å. The Ru(1)-O(29) bond length is 2.43 Å. The Ru(1)-O(7) bond length is 2.05 Å. In the second Ru site, Ru(2,3) is bonded in a 4-coordinate geometry to one O(14), one O(2), one O(20), and one O(8) atom. The Ru(2,3)-O(14) bond length is 2.05 Å. The Ru(2,3)-O(2) bond length is 2.04 Å. The Ru(2,3)-O(20) bond length is 2.03 Å. The Ru(2,3)-O(8) bond length is 2.05 Å. In the third Ru site, Ru(4) is bonded in a 4-coordinate geometry to one O(16), one O(18), one O(4), and one O(6) atom. The Ru(4)-O(16) bond length is 2.05 Å. The Ru(4)-O(18) bond length is 2.03 Å. The Ru(4)-O(4) bond length is 2.04 Å. The Ru(4)-O(6) bond length is 2.05 Å. There are eight inequivalent C sites. In the first C site, C(1) is bonded in a distorted tetrahedral geometry to one C(5), one P(1), one P(5), and one O(25) atom. The C(1)-C(5) bond length is 1.52 Å. The C(1)-P(1) bond length is 1.86 Å. The C(1)-P(5) bond length is 1.85 Å. The C(1)-O(25) bond length is 1.46 Å. In the second C site, C(2) is bonded in a distorted tetrahedral geometry to one C(6), one P(2), one P(6), and one O(26) atom. The C(2)-C(6) bond length is 1.52 Å. The C(2)-P(2) bond length is 1.86 Å. The C(2)-P(6) bond length is 1.85 Å. The C(2)-O(26) bond length is 1.46 Å. In the third C site, C(3) is bonded in a distorted tetrahedral geometry to one C(7), one P(3), one P(7), and one O(27) atom. The C(3)-C(7) bond length is 1.52 Å. The C(3)-P(3) bond length is 1.86 Å. The C(3)-P(7) bond length is 1.85 Å. The C(3)-O(27) bond length is 1.46 Å. In the fourth C site, C(4) is bonded in a distorted tetrahedral geometry to one C(8), one P(4), one P(8), and one O(28) atom. The C(4)-C(8) bond length is 1.52 Å. The C(4)-P(4) bond length is 1.86 Å. The C(4)-P(8) bond length is 1.85 Å. The C(4)-O(28) bond length is 1.46 Å. In the fifth C site, C(5) is bonded in a trigonal non-coplanar geometry to one C(1); one H(29,30,31,32); one H(33,34,35,36); and one H(37,38,39,40) atom. The C(5)-H(29,30,31,32) bond length is 1.10 Å. The C(5)-H(33,34,35,36) bond length is 1.10 Å. The C(5)-H(37,38,39,40) bond length is 1.10 Å. In the sixth C site, C(6) is bonded in a trigonal non-coplanar geometry to one C(2); one H(29,30,31,32); one H(33,34,35,36); and one H(37,38,39,40) atom. The C(6)-H(29,30,31,32) bond length is 1.10 Å. The C(6)-H(33,34,35,36) bond length is 1.10 Å. The C(6)-H(37,38,39,40) bond length is 1.10 Å. In the seventh C site, C(7) is bonded in a trigonal non-coplanar geometry to one C(3); one H(29,30,31,32); one H(33,34,35,36); and one H(37,38,39,40) atom. The C(7)-H(29,30,31,32) bond length is 1.10 Å. The C(7)-H(33,34,35,36) bond length is 1.10 Å. The C(7)-H(37,38,39,40) bond length is 1.10 Å. In the eighth C site, C(8) is bonded in a trigonal non-coplanar geometry to one C(4); one H(29,30,31,32); one H(33,34,35,36); and one H(37,38,39,40) atom. The C(8)-H(29,30,31,32) bond length is 1.10 Å. The C(8)-H(33,34,35,36) bond length is 1.10 Å. The C(8)-H(37,38,39,40) bond length is 1.10 Å. There are eight inequivalent P sites. In the first P site, P(1) is bonded to one C(1), one O(1), one O(5), and one O(9) atom to form corner-sharing PCO3 tetrahedra. The P(1)-O(1) bond length is 1.56 Å. The P(1)-O(5) bond length is 1.58 Å. The P(1)-O(9) bond length is 1.50 Å. In the second P site, P(2) is bonded to one C(2), one O(10), one O(2), and one O(6) atom to form corner-sharing PCO3 tetrahedra. The P(2)-O(10) bond length is 1.50 Å. The P(2)-O(2) bond length is 1.56 Å. The P(2)-O(6) bond length is 1.58 Å. In the third P site, P(3) is bonded to one C(3); one O(11,12); one O(3); and one O(7) atom to form corner-sharing PCO3 tetrahedra. The P(3)-O(11,12) bond length is 1.50 Å. The P(3)-O(3) bond length is 1.56 Å. The P(3)-O(7) bond length is 1.58 Å. In the fourth P site, P(4) is bonded to one C(4); one O(11,12); one O(4); and one O(8) atom to form corner-sharing PCO3 tetrahedra. The P(4)-O(11,12) bond length is 1.50 Å. The P(4)-O(4) bond length is 1.56 Å. The P(4)-O(8) bond length is 1.58 Å. In the fifth P site, P(5) is bonded to one C(1), one O(13), one O(17), and one O(21) atom to form corner-sharing PCO3 tetrahedra. The P(5)-O(13) bond length is 1.57 Å. The P(5)-O(17) bond length is 1.56 Å. The P(5)-O(21) bond length is 1.50 Å. In the sixth P site, P(6) is bonded to one C(2), one O(14), one O(18), and one O(22) atom to form corner-sharing PCO3 tetrahedra. The P(6)-O(14) bond length is 1.57 Å. The P(6)-O(18) bond length is 1.56 Å. The P(6)-O(22) bond length is 1.50 Å. In the seventh P site, P(7) is bonded to one C(3), one O(15), one O(19), and one O(23) atom to form corner-sharing PCO3 tetrahedra. The P(7)-O(15) bond length is 1.57 Å. The P(7)-O(19) bond length is 1.56 Å. The P(7)-O(23) bond length is 1.50 Å. In the eighth P site, P(8) is bonded to one C(4), one O(16), one O(20), and one O(24) atom to form corner-sharing PCO3 tetrahedra. The P(8)-O(16) bond length is 1.57 Å. The P(8)-O(20) bond length is 1.56 Å. The P(8)-O(24) bond length is 1.50 Å. There are eighteen inequivalent H sites. In the first H site, H(1,2,3,4) is bonded in a single-bond geometry to one O(25) atom. The H(1,2,3,4)-O(25) bond length is 0.98 Å. In the second H site, H(5) is bonded in a single-bond geometry to one O(29) atom. The H(5)-O(29) bond length is 0.98 Å. In the third H site, H(9) is bonded in a single-bond geometry to one O(29) atom. The H(9)-O(29) bond length is 0.98 Å. In the fourth H site, H(13) is bonded in a single-bond geometry to one O(33) atom. The H(13)-O(33) bond length is 0.99 Å. In the fifth H site, H(14,16) is bonded in a single-bond geometry to one O(34) atom. The H(14,16)-O(34) bond length is 0.99 Å. In the sixth H site, H(15) is bonded in a single-bond geometry to one O(35,36) atom. The H(15)-O(35,36) bond length is 0.99 Å. In the seventh H site, H(17) is bonded in a single-bond geometry to one O(33) atom. The H(17)-O(33) bond length is 0.99 Å. In the eighth H site, H(18,20) is bonded in a single-bond geometry to one O(34) atom. The H(18,20)-O(34) bond length is 0.99 Å. In the ninth H site, H(19) is bonded in a single-bond geometry to one O(35,36) atom. The H(19)-O(35,36) bond length is 0.99 Å. In the tenth H site, H(21,22) is bonded in a single-bond geometry to one O(37) atom. The H(21,22)-O(37) bond length is 0.99 Å. In the eleventh H site, H(23) is bonded in a single-bond geometry to one O(39,40) atom. The H(23)-O(39,40) bond length is 0.99 Å. In the twelfth H site, H(24) is bonded in a single-bond geometry to one O(39,40) atom. The H(24)-O(39,40) bond length is 0.99 Å. In the thirteenth H site, H(25,26) is bonded in a single-bond geometry to one O(37) atom. The H(25,26)-O(37) bond length is 0.97 Å. In the fourteenth H site, H(27) is bonded in a single-bond geometry to one O(39,40) atom. The H(27)-O(39,40) bond length is 0.97 Å. In the fifteenth H site, H(28) is bonded in a single-bond geometry to one O(39,40) atom. The H(28)-O(39,40) bond length is 0.97 Å. In the sixteenth H site, H(29,30,31,32) is bonded in a single-bond geometry to one C(5) atom. In the seventeenth H site, H(33,34,35,36) is bonded in a single-bond geometry to one C(5) atom. In the eighteenth H site, H(37,38,39,40) is bonded in a single-bond geometry to one C(5) atom. There are thirty-four inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Ru(1) and one P(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Ru(2,3) and one P(2) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Ru(2,3) and one P(3) atom. The O(3)-Ru(2,3) bond length is 2.04 Å. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Ru(4) and one P(4) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Ru(2,3) and one P(1) atom. The O(5)-Ru(2,3) bond length is 2.05 Å. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Ru(4) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Ru(1) and one P(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Ru(2,3) and one P(4) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one Pr(1) and one P(1) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one Pr(1) and one P(2) atom. In the eleventh O site, O(11,12) is bonded in a distorted bent 150 degrees geometry to one Pr(2) and one P(3) atom. In the twelfth O site, O(13) is bonded in a distorted bent 120 degrees geometry to one Ru(1) and one P(5) atom. In the thirteenth O site, O(14) is bonded in a distorted bent 120 degrees geometry to one Ru(2,3) and one P(6) atom. In the fourteenth O site, O(15) is bonded in a distorted bent 120 degrees geometry to one Ru(2,3) and one P(7) atom. The O(15)-Ru(2,3) bond length is 2.05 Å. In the fifteenth O site, O(16) is bonded in a distorted bent 120 degrees geometry to one Ru(4) and one P(8) atom. In the sixteenth O site, O(17) is bonded in a bent 120 degrees geometry to one Ru(2,3) and one P(5) atom. The O(17)-Ru(2,3) bond length is 2.03 Å. In the seventeenth O site, O(18) is bonded in a bent 120 degrees geometry to one Ru(4) and one P(6) atom. In the eighteenth O site, O(19) is bonded in a bent 120 degrees geometry to one Ru(1) and one P(7) atom. In the nineteenth O site, O(20) is bonded in a bent 120 degrees geometry to one Ru(2,3) and one P(8) atom. In the twentieth O site, O(21) is bonded in a distorted bent 150 degrees geometry to one Pr(1) and one P(5) atom. In the twenty-first O site, O(22) is bonded in a distorted bent 150 degrees geometry to one Pr(1) and one P(6) atom. In the twenty-second O site, O(23) is bonded in a distorted bent 150 degrees geometry to one Pr(2) and one P(7) atom. In the twenty-third O site, O(24) is bonded in a distorted bent 150 degrees geometry to one Pr(2) and one P(8) atom. In the twenty-fourth O site, O(25) is bonded in a water-like geometry to one C(1) and one H(1,2,3,4) atom. In the twenty-fifth O site, O(26) is bonded in a water-like geometry to one C(2) and one H(1,2,3,4) atom. The O(26)-H(1,2,3,4) bond length is 0.98 Å. In the twenty-sixth O site, O(27) is bonded in a water-like geometry to one C(3) and one H(1,2,3,4) atom. The O(27)-H(1,2,3,4) bond length is 0.98 Å. In the twenty-seventh O site, O(28) is bonded in a water-like geometry to one C(4) and one H(1,2,3,4) atom. The O(28)-H(1,2,3,4) bond length is 0.98 Å. In the twenty-eighth O site, O(29) is bonded in a distorted water-like geometry to one Ru(1), one H(5), and one H(9) atom. In the twenty-ninth O site, O(33) is bonded in a distorted water-like geometry to one Pr(1), one H(13), and one H(17) atom. In the thirtieth O site, O(34) is bonded in a distorted water-like geometry to one Pr(1); one H(14,16); and one H(18,20) atom. In the thirty-first O site, O(35,36) is bonded in a distorted water-like geometry to one Pr(2), one H(15), and one H(19) atom. In the thirty-second O site, O(37) is bonded in a water-like geometry to one Pr(1); one H(21,22); and one H(25,26) atom. In the thirty-third O site, O(38) is bonded in a water-like geometry to one Pr(1); one H(21,22); and one H(25,26) atom. The O(38)-H(21,22) bond length is 0.99 Å. The O(38)-H(25,26) bond length is 0.97 Å. In the thirty-fourth O site, O(39,40) is bonded in a water-like geometry to one Pr(2), one H(23), and one H(27) atom. Linkers: 4 CC(O)(P([O])([O])=O)P([O])([O])=O. Metal clusters: 2 [Pr] ,4 [Ru]. The MOF has largest included sphere 4.34 A, density 1.96 g/cm3, surface area 2710.83 m2/g, accessible volume 0.19 cm3/g