SmC6N2H4O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 8-coordinate geometry to one N(1), one O(11), one O(13), one O(2), one O(4), one O(6), one O(7), and one O(9) atom. The Sm(1)-N(1) bond length is 2.66 Å. The Sm(1)-O(11) bond length is 2.48 Å. The Sm(1)-O(13) bond length is 2.47 Å. The Sm(1)-O(2) bond length is 2.33 Å. The Sm(1)-O(4) bond length is 2.41 Å. The Sm(1)-O(6) bond length is 2.37 Å. The Sm(1)-O(7) bond length is 2.42 Å. The Sm(1)-O(9) bond length is 2.38 Å. In the second Sm site, Sm(2) is bonded in a 8-coordinate geometry to one N(2), one O(1), one O(10), one O(12), one O(14), one O(3), one O(5), and one O(8) atom. The Sm(2)-N(2) bond length is 2.66 Å. The Sm(2)-O(1) bond length is 2.33 Å. The Sm(2)-O(10) bond length is 2.38 Å. The Sm(2)-O(12) bond length is 2.48 Å. The Sm(2)-O(14) bond length is 2.47 Å. The Sm(2)-O(3) bond length is 2.41 Å. The Sm(2)-O(5) bond length is 2.37 Å. The Sm(2)-O(8) bond length is 2.42 Å. There are ten inequivalent C sites. In the first C site, C(1,2) is bonded in a trigonal planar geometry to one N(1); one N(3,4); and one H(1,2) atom. The C(1,2)-N(1) bond length is 1.33 Å. The C(1,2)-N(3,4) bond length is 1.35 Å. The C(1,2)-H(1,2) bond length is 1.09 Å. In the second C site, C(3) is bonded in a distorted trigonal planar geometry to one C(5), one C(7), and one N(1) atom. The C(3)-C(5) bond length is 1.40 Å. The C(3)-C(7) bond length is 1.48 Å. The C(3)-N(1) bond length is 1.38 Å. In the third C site, C(4) is bonded in a distorted trigonal planar geometry to one C(6), one C(8), and one N(2) atom. The C(4)-C(6) bond length is 1.40 Å. The C(4)-C(8) bond length is 1.48 Å. The C(4)-N(2) bond length is 1.38 Å. In the fourth C site, C(5) is bonded in a distorted single-bond geometry to one C(3); one C(9); and one N(3,4) atom. The C(5)-C(9) bond length is 1.48 Å. The C(5)-N(3,4) bond length is 1.38 Å. In the fifth C site, C(6) is bonded in a distorted single-bond geometry to one C(10); one C(4); and one N(3,4) atom. The C(6)-C(10) bond length is 1.48 Å. The C(6)-N(3,4) bond length is 1.38 Å. In the sixth C site, C(7) is bonded in a bent 120 degrees geometry to one C(3), one O(5), and one O(7) atom. The C(7)-O(5) bond length is 1.26 Å. The C(7)-O(7) bond length is 1.28 Å. In the seventh C site, C(8) is bonded in a bent 120 degrees geometry to one C(4), one O(6), and one O(8) atom. The C(8)-O(6) bond length is 1.26 Å. The C(8)-O(8) bond length is 1.28 Å. In the eighth C site, C(9) is bonded in a bent 120 degrees geometry to one C(5), one O(1), and one O(3) atom. The C(9)-O(1) bond length is 1.27 Å. The C(9)-O(3) bond length is 1.27 Å. In the ninth C site, C(10) is bonded in a bent 120 degrees geometry to one C(6), one O(2), and one O(4) atom. The C(10)-O(2) bond length is 1.27 Å. The C(10)-O(4) bond length is 1.27 Å. In the tenth C site, C(11,12) is bonded in a distorted bent 120 degrees geometry to one O(11) and one O(13) atom. The C(11,12)-O(11) bond length is 1.27 Å. The C(11,12)-O(13) bond length is 1.26 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a distorted water-like geometry to one Sm(1); one C(1,2); and one C(3) atom. In the second N site, N(2) is bonded in a distorted water-like geometry to one Sm(2); one C(1,2); and one C(4) atom. The N(2)-C(1,2) bond length is 1.33 Å. In the third N site, N(3,4) is bonded in a distorted trigonal planar geometry to one C(1,2); one C(5); and one H(3,4) atom. The N(3,4)-H(3,4) bond length is 1.04 Å. There are six inequivalent H sites. In the first H site, H(1,2) is bonded in a single-bond geometry to one C(1,2) atom. In the second H site, H(3,4) is bonded in a single-bond geometry to one N(3,4) atom. In the third H site, H(5) is bonded in a distorted single-bond geometry to one O(8) and one O(9) atom. The H(5)-O(8) bond length is 1.68 Å. The H(5)-O(9) bond length is 1.00 Å. In the fourth H site, H(6) is bonded in a distorted single-bond geometry to one O(10) and one O(7) atom. The H(6)-O(10) bond length is 1.00 Å. The H(6)-O(7) bond length is 1.67 Å. In the fifth H site, H(7) is bonded in a single-bond geometry to one O(9) atom. The H(7)-O(9) bond length is 0.99 Å. In the sixth H site, H(8) is bonded in a single-bond geometry to one O(10) atom. The H(8)-O(10) bond length is 0.99 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Sm(2) and one C(9) atom. In the second O site, O(2) is bonded in a distorted linear geometry to one Sm(1) and one C(10) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Sm(2) and one C(9) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Sm(1) and one C(10) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Sm(2) and one C(7) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Sm(1) and one C(8) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Sm(1), one C(7), and one H(6) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Sm(2), one C(8), and one H(5) atom. In the ninth O site, O(9) is bonded in a distorted water-like geometry to one Sm(1), one H(5), and one H(7) atom. In the tenth O site, O(10) is bonded in a distorted water-like geometry to one Sm(2), one H(6), and one H(8) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Sm(1) and one C(11,12) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Sm(2) and one C(11,12) atom. The O(12)-C(11,12) bond length is 1.27 Å. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one Sm(1) and one C(11,12) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one Sm(2) and one C(11,12) atom. The O(14)-C(11,12) bond length is 1.26 Å. Linkers: 4 [O]C(=O)c1nc[nH]c1C([O])=O. Metal clusters: 4 [Sm]. The MOF has largest included sphere 2.60 A, density 2.61 g/cm3, surface area 2445.85 m2/g, accessible volume 0.08 cm3/g