Pr2C22H11(NO6)3(CNH3)2 crystallizes in the orthorhombic Pnma space group. The structure consists of eight methylammonium molecules inside a Pr2C22H11(NO6)3 framework. In the Pr2C22H11(NO6)3 framework, Pr(1) is bonded in a 9-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 two equivalent O(1) atoms. The Pr(1)-O(2) bond length is 2.53 Å. The Pr(1)-O(3) bond length is 2.41 Å. The Pr(1)-O(4) bond length is 2.48 Å. The Pr(1)-O(5) bond length is 2.39 Å. The Pr(1)-O(6) bond length is 2.39 Å. The Pr(1)-O(7) bond length is 2.61 Å. The Pr(1)-O(8) bond length is 2.73 Å. There is one shorter (2.47 Å) and one longer (2.88 Å) Pr(1)-O(1) bond length. There are twelve inequivalent C sites. In the first C site, C(12) is bonded in a distorted single-bond geometry to two equivalent C(2) and one H(9) atom. Both C(12)-C(2) bond lengths are 1.38 Å. The C(12)-H(9) bond length is 0.93 Å. In the second C site, C(13) is bonded in a trigonal planar geometry to two equivalent C(3) and one N(3) atom. Both C(13)-C(3) bond lengths are 1.36 Å. The C(13)-N(3) bond length is 1.46 Å. In the third C site, C(1) is bonded in a bent 120 degrees geometry to one C(2), one O(3), and one O(4) atom. The C(1)-C(2) bond length is 1.49 Å. The C(1)-O(3) bond length is 1.28 Å. The C(1)-O(4) bond length is 1.24 Å. In the fourth C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(12), and one C(3) atom. The C(2)-C(3) bond length is 1.40 Å. In the fifth C site, C(3) is bonded in a distorted single-bond geometry to one C(13), one C(2), and one H(1) atom. The C(3)-H(1) bond length is 0.93 Å. In the sixth C site, C(4) is bonded in a bent 120 degrees geometry to one C(5), one O(1), and one O(2) atom. The C(4)-C(5) bond length is 1.49 Å. The C(4)-O(1) bond length is 1.27 Å. The C(4)-O(2) bond length is 1.27 Å. In the seventh C site, C(5) is bonded in a trigonal planar geometry to one C(10), one C(4), and one C(6) atom. The C(5)-C(10) bond length is 1.39 Å. The C(5)-C(6) bond length is 1.39 Å. In the eighth C site, C(6) is bonded in a distorted single-bond geometry to one C(5) and one H(2) atom. The C(6)-H(2) bond length is 0.93 Å. In the ninth C site, C(8) is bonded in a distorted single-bond geometry to one C(9) and one H(3) atom. The C(8)-C(9) bond length is 1.39 Å. The C(8)-H(3) bond length is 0.93 Å. In the tenth C site, C(9) is bonded in a trigonal planar geometry to one C(10), one C(11), and one C(8) atom. The C(9)-C(10) bond length is 1.37 Å. The C(9)-C(11) bond length is 1.49 Å. In the eleventh C site, C(10) is bonded in a distorted single-bond geometry to one C(5), one C(9), and one H(4) atom. The C(10)-H(4) bond length is 0.93 Å. In the twelfth C site, C(11) is bonded in a distorted bent 120 degrees geometry to one C(9), one O(5), and one O(6) atom. The C(11)-O(5) bond length is 1.27 Å. The C(11)-O(6) bond length is 1.25 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one O(7), one O(8), and one O(9) atom. The N(1)-O(7) bond length is 1.26 Å. The N(1)-O(8) bond length is 1.23 Å. The N(1)-O(9) bond length is 1.25 Å. In the second N site, N(3) is bonded in a trigonal planar geometry to one C(13) and two equivalent H(5) atoms. Both N(3)-H(5) bond lengths are 0.86 Å. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) 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 C(8) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(10) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one N(3) atom. In the sixth H site, H(9) is bonded in a single-bond geometry to one C(12) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Pr(1) and one C(4) atom. In the second O site, O(2) is bonded in a distorted water-like geometry to one Pr(1) and one C(4) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Pr(1) and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Pr(1) and one C(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Pr(1) and one C(11) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Pr(1) and one C(11) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Pr(1) and one N(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Pr(1) and one N(1) atom. In the ninth O site, O(9) is bonded in a single-bond geometry to one N(1) atom. Linkers: 8 [NH3]c1cc(cc(c1)C(=O)[O])C(=O)[O] ,4 Nc1cc(C([O])=O)cc(C([O])=O)c1. Metal clusters: 8 [Pr]. The MOF has largest included sphere 5.52 A, density 1.66 g/cm3, surface area 3079.93 m2/g, accessible volume 0.27 cm3/g