NdC2H2SO9C3NH7 crystallizes in the monoclinic C2/c space group. The structure consists of eight trimethylammonium molecules inside a NdC2H2SO9 framework. In the NdC2H2SO9 framework, Nd(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(8), one O(9), and two equivalent O(7) atoms. The Nd(1)-O(2) bond length is 2.37 Å. The Nd(1)-O(3) bond length is 2.48 Å. The Nd(1)-O(4) bond length is 2.46 Å. The Nd(1)-O(5) bond length is 2.46 Å. The Nd(1)-O(6) bond length is 2.76 Å. The Nd(1)-O(8) bond length is 2.51 Å. The Nd(1)-O(9) bond length is 2.46 Å. There is one shorter (2.50 Å) and one longer (2.62 Å) Nd(1)-O(7) bond length. There are two inequivalent C sites. In the first C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(5)-O(3) bond length is 1.26 Å. The C(5)-O(4) bond length is 1.27 Å. In the second C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.26 Å. The C(1)-O(2) bond length is 1.26 Å. There are two inequivalent H sites. In the first H site, H(8) is bonded in a distorted single-bond geometry to one O(1) and one O(9) atom. The H(8)-O(1) bond length is 1.68 Å. The H(8)-O(9) bond length is 1.00 Å. In the second H site, H(9) is bonded in a single-bond geometry to one O(9) atom. The H(9)-O(9) bond length is 0.99 Å. S(1) is bonded in a tetrahedral geometry to one O(5), one O(6), one O(7), and one O(8) atom. The S(1)-O(5) bond length is 1.48 Å. The S(1)-O(6) bond length is 1.49 Å. The S(1)-O(7) bond length is 1.52 Å. The S(1)-O(8) bond length is 1.48 Å. There are nine inequivalent O sites. In the first O site, O(7) is bonded in a 3-coordinate geometry to two equivalent Nd(1) and one S(1) atom. In the second O site, O(8) is bonded in a distorted water-like geometry to one Nd(1) and one S(1) atom. In the third O site, O(1) is bonded in a 2-coordinate geometry to one C(1) and one H(8) atom. In the fourth O site, O(9) is bonded in a distorted water-like geometry to one Nd(1), one H(8), and one H(9) atom. In the fifth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Nd(1) and one C(1) atom. In the sixth O site, O(3) is bonded in a distorted single-bond geometry to one Nd(1) and one C(5) atom. In the seventh O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Nd(1) and one C(5) atom. In the eighth O site, O(6) is bonded in a single-bond geometry to one Nd(1) and one S(1) atom. In the ninth O site, O(5) is bonded in a water-like geometry to one Nd(1) and one S(1) atom. Linkers: 2 [O]C(=O)C[NH]1CC[NH](CC1)CC(=O)[O] ,2 [O]C(=O)C([O])=O. Metal clusters: 4 [Nd]. The MOF has largest included sphere 1.91 A, density 2.62 g/cm3, surface area 2529.51 m2/g, accessible volume 0.06 cm3/g