Sm2ZnC30H20(NO10)2(CN)2 crystallizes in the orthorhombic Iba2 space group. The structure consists of four 1,2-dimethylhydrazine molecules inside a Sm2ZnC30H20(NO10)2 framework. In the Sm2ZnC30H20(NO10)2 framework, Sm(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(4), one O(7), one O(8), and one O(9) atom. The Sm(1)-O(1) bond length is 2.46 Å. The Sm(1)-O(10) bond length is 2.42 Å. The Sm(1)-O(2) bond length is 2.54 Å. The Sm(1)-O(4) bond length is 2.41 Å. The Sm(1)-O(7) bond length is 2.42 Å. The Sm(1)-O(8) bond length is 2.32 Å. The Sm(1)-O(9) bond length is 2.41 Å. Zn(1) is bonded in a distorted tetrahedral geometry to two equivalent O(2) and two equivalent O(5) atoms. Both Zn(1)-O(2) bond lengths are 2.08 Å. Both Zn(1)-O(5) bond lengths are 1.94 Å. There are fifteen inequivalent C sites. In the first C site, C(10) is bonded in a distorted bent 120 degrees geometry to one C(13), one O(10), and one O(9) atom. The C(10)-C(13) bond length is 1.49 Å. The C(10)-O(10) bond length is 1.29 Å. The C(10)-O(9) bond length is 1.28 Å. In the second C site, C(11) is bonded in a distorted single-bond geometry to one C(12), one C(13), and one H(8) atom. The C(11)-C(12) bond length is 1.40 Å. The C(11)-C(13) bond length is 1.40 Å. The C(11)-H(8) bond length is 1.09 Å. In the third C site, C(12) is bonded in a trigonal planar geometry to one C(1), one C(11), and one C(15) atom. The C(12)-C(1) bond length is 1.48 Å. The C(12)-C(15) bond length is 1.40 Å. In the fourth C site, C(13) is bonded in a trigonal planar geometry to one C(10), one C(11), and one C(14) atom. The C(13)-C(14) bond length is 1.40 Å. In the fifth C site, C(14) is bonded in a distorted trigonal planar geometry to one C(13), one C(16), and one H(9) atom. The C(14)-C(16) bond length is 1.40 Å. The C(14)-H(9) bond length is 1.09 Å. In the sixth C site, C(15) is bonded in a distorted trigonal planar geometry to one C(12), one C(16), and one H(10) atom. The C(15)-C(16) bond length is 1.40 Å. The C(15)-H(10) bond length is 1.09 Å. In the seventh C site, C(16) is bonded in a distorted trigonal planar geometry to one C(14), one C(15), and one N(2) atom. The C(16)-N(2) bond length is 1.42 Å. In the eighth C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(12), one O(1), and one O(2) atom. The C(1)-O(1) bond length is 1.27 Å. The C(1)-O(2) bond length is 1.31 Å. In the ninth C site, C(2) is bonded in a distorted single-bond geometry to one C(4) and one H(1) atom. The C(2)-C(4) bond length is 1.39 Å. The C(2)-H(1) bond length is 1.09 Å. In the tenth C site, C(3) is bonded in a trigonal planar geometry to one C(5), one C(7), and one C(9) atom. The C(3)-C(5) bond length is 1.39 Å. The C(3)-C(7) bond length is 1.40 Å. The C(3)-C(9) bond length is 1.49 Å. In the eleventh C site, C(4) is bonded in a trigonal planar geometry to one C(2), one C(5), and one C(6) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-C(6) bond length is 1.49 Å. In the twelfth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(3), one C(4), and one H(2) atom. The C(5)-H(2) bond length is 1.09 Å. In the thirteenth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(5), and one O(8) atom. The C(6)-O(5) bond length is 1.28 Å. The C(6)-O(8) bond length is 1.27 Å. In the fourteenth C site, C(7) is bonded in a distorted single-bond geometry to one C(3) and one H(3) atom. The C(7)-H(3) bond length is 1.09 Å. In the fifteenth C site, C(9) is bonded in a bent 120 degrees geometry to one C(3), one O(3), and one O(4) atom. The C(9)-O(3) bond length is 1.28 Å. The C(9)-O(4) bond length is 1.28 Å. N(2) is bonded in a distorted bent 120 degrees geometry to one C(16) and one N(2) atom. The N(2)-N(2) bond length is 1.26 Å. There are ten inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(5) 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 O(6) atom. The H(4)-O(6) bond length is 0.98 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(6) atom. The H(5)-O(6) bond length is 1.02 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(7) atom. The H(6)-O(7) bond length is 0.97 Å. In the seventh H site, H(7) is bonded in a distorted linear geometry to one O(6) and one O(7) atom. The H(7)-O(6) bond length is 1.65 Å. The H(7)-O(7) bond length is 1.00 Å. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(11) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(14) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(15) atom. There are ten inequivalent O sites. In the first O site, O(6) is bonded in a distorted water-like geometry to one H(4), one H(5), and one H(7) atom. In the second O site, O(7) is bonded in a 3-coordinate geometry to one Sm(1), one H(6), and one H(7) atom. In the third O site, O(8) is bonded in a bent 150 degrees geometry to one Sm(1) and one C(6) atom. In the fourth O site, O(9) is bonded in an L-shaped geometry to one Sm(1) and one C(10) atom. In the fifth O site, O(10) is bonded in a distorted L-shaped geometry to one Sm(1) and one C(10) atom. In the sixth O site, O(1) is bonded in a distorted L-shaped geometry to one Sm(1) and one C(1) atom. In the seventh O site, O(2) is bonded in a 3-coordinate geometry to one Sm(1), one Zn(1), and one C(1) atom. In the eighth O site, O(3) is bonded in a distorted single-bond geometry to one C(9) atom. In the ninth O site, O(5) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(6) atom. In the tenth O site, O(4) is bonded in a distorted water-like geometry to one Sm(1) and one C(9) atom. Linkers: 4 [O]C(=O)c1cc([N][N]c2cc(C([O])=O)cc(C([O])=O)c2)cc(C([O])=O)c1. Metal clusters: 2 O.O.O.O.O=[C]O[Sm]12(O[C]O[Zn]3(O[C]O1)O[C]O[Sm]1(O[C]=O)(O[C]O3)O[C]O1)O[C]O2. The MOF has largest included sphere 3.85 A, density 1.76 g/cm3, surface area 3400.26 m2/g, accessible volume 0.20 cm3/g