PrC9N4H13O9 crystallizes in the triclinic P-1 space group. Pr(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. The Pr(1)-O(2) bond length is 2.52 Å. The Pr(1)-O(3) bond length is 2.48 Å. The Pr(1)-O(4) bond length is 2.53 Å. The Pr(1)-O(5) bond length is 2.44 Å. The Pr(1)-O(6) bond length is 2.51 Å. The Pr(1)-O(7) bond length is 2.57 Å. The Pr(1)-O(8) bond length is 2.39 Å. The Pr(1)-O(9) bond length is 2.50 Å. There are nine inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(1), and one O(5) atom. The C(1)-C(4) bond length is 1.49 Å. The C(1)-O(1) bond length is 1.29 Å. The C(1)-O(5) bond length is 1.26 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(7) atom. The C(2)-C(3) bond length is 1.46 Å. The C(2)-C(5) bond length is 1.40 Å. The C(2)-C(7) bond length is 1.40 Å. In the third C site, C(3) is bonded in a distorted water-like geometry to one C(2), one N(2), and one N(3) atom. The C(3)-N(2) bond length is 1.35 Å. The C(3)-N(3) bond length is 1.35 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(1), one C(5), and one C(6) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-C(6) bond length is 1.40 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(11) atom. The C(5)-H(11) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(4), one C(8), and one H(12) atom. The C(6)-C(8) bond length is 1.40 Å. The C(6)-H(12) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(2), one C(8), and one H(13) atom. The C(7)-C(8) bond length is 1.40 Å. The C(7)-H(13) bond length is 1.09 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(6), one C(7), and one C(9) atom. The C(8)-C(9) bond length is 1.50 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(8), one O(8), and one O(9) atom. The C(9)-O(8) bond length is 1.27 Å. The C(9)-O(9) bond length is 1.28 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded in a distorted water-like geometry to one N(2) and one N(4) atom. The N(1)-N(2) bond length is 1.34 Å. The N(1)-N(4) bond length is 1.32 Å. In the second N site, N(2) is bonded in a 3-coordinate geometry to one C(3), one N(1), and one H(7) atom. The N(2)-H(7) bond length is 1.73 Å. In the third N site, N(3) is bonded in a distorted single-bond geometry to one C(3) and one N(4) atom. The N(3)-N(4) bond length is 1.34 Å. In the fourth N site, N(4) is bonded in a distorted trigonal planar geometry to one N(1), one N(3), and one H(2) atom. The N(4)-H(2) bond length is 1.67 Å. There are thirteen inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(2) atom. The H(1)-O(2) bond length is 0.98 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one N(4) and one O(2) atom. The H(2)-O(2) bond length is 1.01 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(3) atom. The H(3)-O(3) bond length is 1.00 Å. 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 0.99 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(4) atom. The H(5)-O(4) bond length is 0.97 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(4) atom. The H(6)-O(4) bond length is 0.99 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one N(2) and one O(6) atom. The H(7)-O(6) bond length is 1.01 Å. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(6) atom. The H(8)-O(6) bond length is 0.99 Å. In the ninth H site, H(9) is bonded in a distorted single-bond geometry to one O(7) atom. The H(9)-O(7) bond length is 1.01 Å. In the tenth H site, H(10) is bonded in a single-bond geometry to one O(7) atom. The H(10)-O(7) bond length is 1.00 Å. In the eleventh H site, H(11) is bonded in a single-bond geometry to one C(5) atom. In the twelfth H site, H(12) is bonded in a single-bond geometry to one C(6) atom. In the thirteenth H site, H(13) is bonded in a single-bond geometry to one C(7) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to one C(1) atom. In the second O site, O(2) is bonded in a water-like geometry to one Pr(1), one H(1), and one H(2) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Pr(1), one H(3), and one H(4) atom. In the fourth O site, O(4) is bonded in a water-like geometry to one Pr(1), one H(5), and one H(6) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Pr(1) and one C(1) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one Pr(1), one H(7), and one H(8) atom. In the seventh O site, O(7) is bonded in a water-like geometry to one Pr(1), one H(10), and one H(9) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Pr(1) and one C(9) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Pr(1) and one C(9) atom. Linkers: 2 [O]C(=O)c1cc(C([O])=O)cc(C2=NN=N[N]2)c1. Metal clusters: 1 O.O.O.O.O.O.O.O.O.O.[O][C]O[Pr]1O[C]O[Pr](O[C][O])O[C]O1. The MOF has largest included sphere 1.73 A, density 2.32 g/cm3, surface area 2905.69 m2/g, accessible volume 0.05 cm3/g