PrC6N2H4O7 crystallizes in the triclinic P-1 space group. Pr(1,2) is bonded in a 8-coordinate geometry to one N(1), one O(1), one O(11), one O(13), one O(4), one O(6), one O(8), and one O(9) atom. The Pr(1,2)-N(1) bond length is 2.72 Å. The Pr(1,2)-O(1) bond length is 2.47 Å. The Pr(1,2)-O(11) bond length is 2.45 Å. The Pr(1,2)-O(13) bond length is 2.53 Å. The Pr(1,2)-O(4) bond length is 2.38 Å. The Pr(1,2)-O(6) bond length is 2.41 Å. The Pr(1,2)-O(8) bond length is 2.48 Å. The Pr(1,2)-O(9) bond length is 2.52 Å. There are ten inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(3), one C(7), and one N(1) atom. The C(1)-C(3) bond length is 1.48 Å. The C(1)-C(7) bond length is 1.40 Å. The C(1)-N(1) bond length is 1.38 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(4), one C(8), and one N(2) atom. The C(2)-C(4) bond length is 1.48 Å. The C(2)-C(8) bond length is 1.40 Å. The C(2)-N(2) bond length is 1.38 Å. In the third C site, C(3) is bonded in a bent 120 degrees geometry to one C(1), one O(1), and one O(5) atom. The C(3)-O(1) bond length is 1.28 Å. The C(3)-O(5) bond length is 1.26 Å. In the fourth C site, C(4) is bonded in a bent 120 degrees geometry to one C(2), one O(2), and one O(6) atom. The C(4)-O(2) bond length is 1.28 Å. The C(4)-O(6) bond length is 1.26 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one N(1), one N(3), and one H(1) atom. The C(5)-N(1) bond length is 1.33 Å. The C(5)-N(3) bond length is 1.35 Å. The C(5)-H(1) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one N(2), one N(4), and one H(2) atom. The C(6)-N(2) bond length is 1.33 Å. The C(6)-N(4) bond length is 1.35 Å. The C(6)-H(2) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(1); one C(9,10); and one N(3) atom. The C(7)-C(9,10) bond length is 1.48 Å. The C(7)-N(3) bond length is 1.38 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to one C(2); one C(9,10); and one N(4) atom. The C(8)-C(9,10) bond length is 1.48 Å. The C(8)-N(4) bond length is 1.38 Å. In the ninth C site, C(9,10) is bonded in a bent 120 degrees geometry to one C(7), one O(3), and one O(7) atom. The C(9,10)-O(3) bond length is 1.27 Å. The C(9,10)-O(7) bond length is 1.27 Å. In the tenth C site, C(11,12) is bonded in a distorted bent 120 degrees geometry to one O(13) and one O(9) atom. The C(11,12)-O(13) bond length is 1.27 Å. The C(11,12)-O(9) bond length is 1.26 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded in a distorted water-like geometry to one Pr(1,2); one C(1); and one C(5) atom. In the second N site, N(2) is bonded in a distorted water-like geometry to one Pr(1,2); one C(2); and one C(6) atom. The N(2)-Pr(1,2) bond length is 2.72 Å. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one C(5), one C(7), and one H(3) atom. The N(3)-H(3) bond length is 1.04 Å. In the fourth N site, N(4) is bonded in a distorted trigonal planar geometry to one C(6), one C(8), and one H(4) atom. The N(4)-H(4) bond length is 1.04 Å. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(6) atom. In the third H site, H(3) is bonded in a single-bond geometry to one N(3) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one N(4) atom. In the fifth H site, H(5,6) is bonded in a distorted single-bond geometry to one O(11) and one O(2) atom. The H(5,6)-O(11) bond length is 1.00 Å. The H(5,6)-O(2) bond length is 1.68 Å. In the sixth H site, H(7,8) is bonded in a single-bond geometry to one O(11) atom. The H(7,8)-O(11) bond length is 0.99 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Pr(1,2); one C(3); and one H(5,6) atom. The O(1)-H(5,6) bond length is 1.68 Å. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Pr(1,2); one C(4); and one H(5,6) atom. The O(2)-Pr(1,2) bond length is 2.47 Å. In the third O site, O(3) is bonded in a distorted linear geometry to one Pr(1,2) and one C(9,10) atom. The O(3)-Pr(1,2) bond length is 2.38 Å. In the fourth O site, O(4) is bonded in a distorted linear geometry to one Pr(1,2) and one C(9,10) atom. The O(4)-C(9,10) bond length is 1.27 Å. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Pr(1,2) and one C(3) atom. The O(5)-Pr(1,2) bond length is 2.42 Å. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Pr(1,2) and one C(4) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Pr(1,2) and one C(9,10) atom. The O(7)-Pr(1,2) bond length is 2.48 Å. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Pr(1,2) and one C(9,10) atom. The O(8)-C(9,10) bond length is 1.27 Å. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Pr(1,2) and one C(11,12) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Pr(1,2) and one C(11,12) atom. The O(10)-Pr(1,2) bond length is 2.52 Å. The O(10)-C(11,12) bond length is 1.26 Å. In the eleventh O site, O(11) is bonded in a distorted water-like geometry to one Pr(1,2); one H(5,6); and one H(7,8) atom. In the twelfth O site, O(12) is bonded in a distorted water-like geometry to one Pr(1,2); one H(5,6); and one H(7,8) atom. The O(12)-Pr(1,2) bond length is 2.45 Å. The O(12)-H(5,6) bond length is 1.00 Å. The O(12)-H(7,8) bond length is 0.99 Å. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one Pr(1,2) and one C(11,12) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 120 degrees geometry to one Pr(1,2) and one C(11,12) atom. The O(14)-Pr(1,2) bond length is 2.53 Å. The O(14)-C(11,12) bond length is 1.27 Å. Linkers: 4 [O]C(=O)c1nc[nH]c1C([O])=O ,1 [O]C(=O)C([O])=O. Metal clusters: 4 [Pr]. The MOF has largest included sphere 2.66 A, density 2.46 g/cm3, surface area 2557.35 m2/g, accessible volume 0.09 cm3/g