PrCoC36H18(NO2)6 crystallizes in the orthorhombic Fddd space group. Pr(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. Both Pr(1)-O(1) bond lengths are 2.60 Å. Both Pr(1)-O(2) bond lengths are 2.66 Å. Both Pr(1)-O(4) bond lengths are 2.40 Å. Both Pr(1)-O(5) bond lengths are 2.83 Å. Both Pr(1)-O(6) bond lengths are 2.56 Å. Co(1) is bonded in an octahedral geometry to two equivalent N(1), two equivalent N(2), and two equivalent N(3) atoms. Both Co(1)-N(1) bond lengths are 1.94 Å. Both Co(1)-N(2) bond lengths are 1.94 Å. Both Co(1)-N(3) bond lengths are 1.92 Å. There are eighteen inequivalent C sites. In the first C site, C(9) is bonded in a distorted trigonal planar geometry to one C(10), one C(8), and one H(5) atom. The C(9)-C(10) bond length is 1.39 Å. The C(9)-C(8) bond length is 1.40 Å. The C(9)-H(5) bond length is 1.09 Å. In the second C site, C(10) is bonded in a distorted bent 120 degrees geometry to one C(9), one N(2), and one H(6) atom. The C(10)-N(2) bond length is 1.35 Å. The C(10)-H(6) bond length is 1.09 Å. In the third C site, C(11) is bonded in a bent 120 degrees geometry to one C(3), one O(1), and one O(2) atom. The C(11)-C(3) bond length is 1.51 Å. The C(11)-O(1) bond length is 1.27 Å. The C(11)-O(2) bond length is 1.27 Å. In the fourth C site, C(12) is bonded in a distorted bent 120 degrees geometry to one C(8), one O(3), and one O(4) atom. The C(12)-C(8) bond length is 1.53 Å. The C(12)-O(3) bond length is 1.25 Å. The C(12)-O(4) bond length is 1.27 Å. In the fifth C site, C(13) is bonded in a distorted bent 120 degrees geometry to one C(14), one N(3), and one H(7) atom. The C(13)-C(14) bond length is 1.39 Å. The C(13)-N(3) bond length is 1.35 Å. The C(13)-H(7) bond length is 1.09 Å. In the sixth C site, C(14) is bonded in a distorted trigonal planar geometry to one C(13), one C(15), and one H(8) atom. The C(14)-C(15) bond length is 1.40 Å. The C(14)-H(8) bond length is 1.09 Å. In the seventh C site, C(15) is bonded in a trigonal planar geometry to one C(14), one C(16), and one C(18) atom. The C(15)-C(16) bond length is 1.40 Å. The C(15)-C(18) bond length is 1.51 Å. In the eighth C site, C(16) is bonded in a distorted trigonal planar geometry to one C(15), one C(17), and one H(9) atom. The C(16)-C(17) bond length is 1.39 Å. The C(16)-H(9) bond length is 1.09 Å. In the ninth C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one N(1), and one H(1) atom. The C(1)-C(2) bond length is 1.39 Å. The C(1)-N(1) bond length is 1.35 Å. The C(1)-H(1) bond length is 1.09 Å. In the tenth C site, C(17) is bonded in a distorted single-bond geometry to one C(16) and one N(3) atom. The C(17)-N(3) bond length is 1.37 Å. In the eleventh C site, C(2) is bonded in a distorted trigonal planar geometry to one C(1), one C(3), and one H(2) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-H(2) bond length is 1.09 Å. In the twelfth C site, C(18) is bonded in a distorted bent 120 degrees geometry to one C(15), one O(5), and one O(6) atom. The C(18)-O(5) bond length is 1.26 Å. The C(18)-O(6) bond length is 1.27 Å. In the thirteenth C site, C(3) is bonded in a trigonal planar geometry to one C(11), one C(2), and one C(4) atom. The C(3)-C(4) bond length is 1.39 Å. In the fourteenth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(3), one C(5), and one H(4) atom. The C(4)-C(5) bond length is 1.39 Å. The C(4)-H(4) bond length is 1.09 Å. In the fifteenth C site, C(5) is bonded in a distorted single-bond geometry to one C(4) and one N(1) atom. The C(5)-N(1) bond length is 1.36 Å. In the sixteenth C site, C(6) is bonded in a distorted single-bond geometry to one C(7) and one N(2) atom. The C(6)-C(7) bond length is 1.39 Å. The C(6)-N(2) bond length is 1.36 Å. In the seventeenth C site, C(7) is bonded in a distorted trigonal planar geometry to one C(6), one C(8), and one H(3) atom. The C(7)-C(8) bond length is 1.39 Å. The C(7)-H(3) bond length is 1.09 Å. In the eighteenth C site, C(8) is bonded in a trigonal planar geometry to one C(12), one C(7), and one C(9) atom. There are three inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Co(1), one C(1), and one C(5) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one Co(1), one C(10), and one C(6) atom. In the third N site, N(3) is bonded in a trigonal planar geometry to one Co(1), one C(13), and one C(17) atom. There are nine inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(7) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(4) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(9) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(10) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(13) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(14) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(16) atom. There are six inequivalent O sites. In the first O site, O(5) is bonded in a single-bond geometry to one Pr(1) and one C(18) atom. In the second O site, O(6) is bonded in a distorted water-like geometry to one Pr(1) and one C(18) atom. In the third O site, O(4) is bonded in a bent 150 degrees geometry to one Pr(1) and one C(12) atom. In the fourth O site, O(1) is bonded in a distorted single-bond geometry to one Pr(1) and one C(11) atom. In the fifth O site, O(2) is bonded in a distorted single-bond geometry to one Pr(1) and one C(11) atom. In the sixth O site, O(3) is bonded in a single-bond geometry to one C(12) atom. Linkers: 12 [O]C(=O)c1ccnc(-c2cc(C([O])=O)ccn2)c1. Metal clusters: 4 O=[C]O[Pr](O[C]=O)(O[C]=O)(O[C]=O)(O[C]=O)O[C]=O ,4 [Co]. The MOF has largest included sphere 7.08 A, density 1.04 g/cm3, surface area 3682.80 m2/g, accessible volume 0.57 cm3/g