Sm2CuC28(NO4)4 crystallizes in the monoclinic P2_1/c space group. Sm(1) is bonded in a distorted pentagonal planar geometry to one N(1), one O(1), one O(2), one O(3), and one O(7) atom. The Sm(1)-N(1) bond length is 2.60 Å. The Sm(1)-O(1) bond length is 2.43 Å. The Sm(1)-O(2) bond length is 2.35 Å. The Sm(1)-O(3) bond length is 2.35 Å. The Sm(1)-O(7) bond length is 2.41 Å. Cu(1) is bonded in a distorted square co-planar geometry to two equivalent N(2) and two equivalent O(5) atoms. Both Cu(1)-N(2) bond lengths are 1.96 Å. Both Cu(1)-O(5) bond lengths are 1.95 Å. There are fourteen inequivalent C sites. In the first 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 1.25 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(3) and one N(1) atom. The C(2)-C(3) bond length is 1.38 Å. The C(2)-N(1) bond length is 1.34 Å. In the third C site, C(3) is bonded in a bent 120 degrees geometry to one C(2) and one C(4) atom. The C(3)-C(4) bond length is 1.39 Å. In the fourth C site, C(4) is bonded in a bent 120 degrees geometry to one C(3) and one C(5) atom. The C(4)-C(5) bond length is 1.39 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(7) atom. The C(5)-C(6) bond length is 1.39 Å. The C(5)-C(7) bond length is 1.51 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(5) and one N(1) atom. The C(6)-N(1) bond length is 1.34 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(3), and one O(4) atom. The C(7)-O(3) bond length is 1.26 Å. The C(7)-O(4) bond length is 1.25 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(9), one O(5), and one O(6) atom. The C(8)-C(9) bond length is 1.51 Å. The C(8)-O(5) bond length is 1.28 Å. The C(8)-O(6) bond length is 1.24 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 N(2) atom. The C(9)-C(10) bond length is 1.39 Å. The C(9)-N(2) bond length is 1.36 Å. In the tenth C site, C(10) is bonded in a bent 120 degrees geometry to one C(11) and one C(9) atom. The C(10)-C(11) bond length is 1.39 Å. In the eleventh C site, C(11) is bonded in a bent 120 degrees geometry to one C(10) and one C(12) atom. The C(11)-C(12) bond length is 1.39 Å. In the twelfth C site, C(12) is bonded in a trigonal planar geometry to one C(11), one C(13), and one C(14) atom. The C(12)-C(13) bond length is 1.39 Å. The C(12)-C(14) bond length is 1.51 Å. In the thirteenth C site, C(13) is bonded in a distorted bent 120 degrees geometry to one C(12) and one N(2) atom. The C(13)-N(2) bond length is 1.34 Å. In the fourteenth C site, C(14) is bonded in a distorted bent 120 degrees geometry to one C(12), one O(7), and one O(8) atom. The C(14)-O(7) bond length is 1.26 Å. The C(14)-O(8) bond length is 1.24 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted bent 120 degrees geometry to one Sm(1), one C(2), and one C(6) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one Cu(1), one C(13), and one C(9) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Sm(1) and one C(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Sm(1) and one C(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Sm(1) and one C(7) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one C(7) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(8) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one C(8) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Sm(1) and one C(14) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one C(14) atom. Linkers: 8 [O]C(=O)c1[c][c]c(C([O])=O)n[c]1. Metal clusters: 4 [Sm] ,2 [Cu]. The MOF has largest included sphere 4.03 A, density 1.83 g/cm3, surface area 3423.99 m2/g, accessible volume 0.15 cm3/g