La2C18H9(NO4)3 crystallizes in the monoclinic P2/c space group. La(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and two equivalent O(1) atoms to form distorted edge-sharing LaO7 pentagonal bipyramids. The La(1)-O(2) bond length is 2.46 Å. The La(1)-O(3) bond length is 2.46 Å. The La(1)-O(4) bond length is 2.38 Å. The La(1)-O(5) bond length is 2.44 Å. The La(1)-O(6) bond length is 2.37 Å. There is one shorter (2.52 Å) and one longer (2.65 Å) La(1)-O(1) bond length. There are ten inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one N(1), and one O(1) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-N(1) bond length is 1.38 Å. The C(1)-O(1) bond length is 1.31 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(3) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-H(3) bond length is 1.08 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(5) atom. The C(3)-C(4) bond length is 1.51 Å. The C(3)-C(5) bond length is 1.39 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(2), and one O(3) atom. The C(4)-O(2) bond length is 1.27 Å. The C(4)-O(3) bond length is 1.27 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(3) and one H(4) atom. The C(5)-H(4) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one N(1) and one O(4) atom. The C(6)-N(1) bond length is 1.38 Å. The C(6)-O(4) bond length is 1.28 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(8) and two equivalent O(5) atoms. The C(7)-C(8) bond length is 1.50 Å. Both C(7)-O(5) bond lengths are 1.27 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(7) and two equivalent C(9) atoms. Both C(8)-C(9) bond lengths are 1.40 Å. In the ninth C site, C(9) is bonded in a distorted single-bond geometry to one C(10), one C(8), and one H(5) atom. The C(9)-C(10) bond length is 1.40 Å. The C(9)-H(5) bond length is 1.09 Å. In the tenth C site, C(10) is bonded in a distorted trigonal planar geometry to one C(9), one N(2), and one O(6) atom. The C(10)-N(2) bond length is 1.38 Å. The C(10)-O(6) bond length is 1.29 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one C(1), one C(6), and one H(1) atom. The N(1)-H(1) bond length is 1.03 Å. In the second N site, N(2) is bonded in a trigonal planar geometry to two equivalent C(10) and one H(2) atom. The N(2)-H(2) bond length is 1.03 Å. There are five inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one N(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one N(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(2) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(5) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(9) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent La(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one La(1) and one C(4) atom. In the third O site, O(3) is bonded in a distorted linear geometry to one La(1) and one C(4) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one La(1) and one C(6) atom. In the fifth O site, O(5) is bonded in a distorted linear geometry to one La(1) and one C(7) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one La(1) and one C(10) atom. Linkers: 6 [O]C(=O)C1=CC(=O)NC(=O)[CH]1. Metal clusters: 4 [La]. The MOF has largest included sphere 2.07 A, density 2.57 g/cm3, surface area 2258.02 m2/g, accessible volume 0.05 cm3/g