Sm2Cu2H5(C5O4)5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 4-coordinate geometry to one O(1), one O(12), one O(15), and one O(9) atom. The Sm(1)-O(1) bond length is 2.39 Å. The Sm(1)-O(12) bond length is 2.50 Å. The Sm(1)-O(15) bond length is 2.37 Å. The Sm(1)-O(9) bond length is 2.54 Å. In the second Sm site, Sm(2) is bonded in a distorted pentagonal planar geometry to one O(13), one O(16), one O(17), one O(4), and one O(7) atom. The Sm(2)-O(13) bond length is 2.59 Å. The Sm(2)-O(16) bond length is 2.38 Å. The Sm(2)-O(17) bond length is 2.51 Å. The Sm(2)-O(4) bond length is 2.40 Å. The Sm(2)-O(7) bond length is 2.38 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted T-shaped geometry to one O(14), one O(19), and one O(6) atom. The Cu(1)-O(14) bond length is 1.99 Å. The Cu(1)-O(19) bond length is 1.96 Å. The Cu(1)-O(6) bond length is 1.95 Å. In the second Cu site, Cu(2) is bonded in a 2-coordinate geometry to one O(11) and one O(18) atom. The Cu(2)-O(11) bond length is 1.98 Å. The Cu(2)-O(18) bond length is 1.96 Å. There are twenty-five inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(25), and one C(8) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(25) bond length is 1.51 Å. The C(1)-C(8) bond length is 1.39 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(11), and one C(6) atom. The C(2)-C(11) bond length is 1.50 Å. The C(2)-C(6) bond length is 1.39 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(15), one C(21), and one C(6) atom. The C(3)-C(15) bond length is 1.40 Å. The C(3)-C(21) bond length is 1.50 Å. The C(3)-C(6) bond length is 1.40 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(14), one O(10), and one O(14) atom. The C(4)-C(14) bond length is 1.49 Å. The C(4)-O(10) bond length is 1.25 Å. The C(4)-O(14) bond length is 1.26 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(16), one O(3), and one O(4) atom. The C(5)-C(16) bond length is 1.48 Å. The C(5)-O(3) bond length is 1.24 Å. The C(5)-O(4) bond length is 1.27 Å. In the sixth C site, C(6) is bonded in a single-bond geometry to one C(2), one C(3), and one H(5) atom. The C(6)-H(5) bond length is 0.93 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(15), one O(15), and one O(6) atom. The C(7)-C(15) bond length is 1.49 Å. The C(7)-O(15) bond length is 1.25 Å. The C(7)-O(6) bond length is 1.27 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to one C(1), one C(15), and one H(4) atom. The C(8)-C(15) bond length is 1.40 Å. The C(8)-H(4) bond length is 0.93 Å. In the ninth C site, C(9) is bonded in a single-bond geometry to one C(14), one C(18), and one H(3) atom. The C(9)-C(14) bond length is 1.39 Å. The C(9)-C(18) bond length is 1.39 Å. The C(9)-H(3) bond length is 0.93 Å. In the tenth C site, C(10) is bonded in a distorted bent 120 degrees geometry to one C(17), one O(2), and one O(7) atom. The C(10)-C(17) bond length is 1.49 Å. The C(10)-O(2) bond length is 1.27 Å. The C(10)-O(7) bond length is 1.25 Å. In the eleventh C site, C(11) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(19) atom. The C(11)-O(1) bond length is 1.26 Å. The C(11)-O(19) bond length is 1.26 Å. In the twelfth C site, C(12) is bonded in a distorted bent 120 degrees geometry to one C(18), one O(16), and one O(18) atom. The C(12)-C(18) bond length is 1.51 Å. The C(12)-O(16) bond length is 1.25 Å. The C(12)-O(18) bond length is 1.25 Å. In the thirteenth C site, C(13) is bonded in a distorted single-bond geometry to one C(16), one C(24), and one H(1) atom. The C(13)-C(16) bond length is 1.40 Å. The C(13)-C(24) bond length is 1.37 Å. The C(13)-H(1) bond length is 0.93 Å. In the fourteenth C site, C(14) is bonded in a trigonal planar geometry to one C(17), one C(4), and one C(9) atom. The C(14)-C(17) bond length is 1.41 Å. In the fifteenth C site, C(15) is bonded in a trigonal planar geometry to one C(3), one C(7), and one C(8) atom. In the sixteenth C site, C(16) is bonded in a trigonal planar geometry to one C(13), one C(24), and one C(5) atom. The C(16)-C(24) bond length is 1.41 Å. In the seventeenth C site, C(17) is bonded in a trigonal planar geometry to one C(10), one C(14), and one C(22) atom. The C(17)-C(22) bond length is 1.40 Å. In the eighteenth C site, C(18) is bonded in a trigonal planar geometry to one C(12), one C(20), and one C(9) atom. The C(18)-C(20) bond length is 1.39 Å. In the nineteenth C site, C(19) is bonded in a distorted bent 120 degrees geometry to one C(20), one O(12), and one O(9) atom. The C(19)-C(20) bond length is 1.50 Å. The C(19)-O(12) bond length is 1.27 Å. The C(19)-O(9) bond length is 1.25 Å. In the twentieth C site, C(20) is bonded in a trigonal planar geometry to one C(18), one C(19), and one C(22) atom. The C(20)-C(22) bond length is 1.39 Å. In the twenty-first C site, C(21) is bonded in a bent 120 degrees geometry to one C(3), one O(13), and one O(17) atom. The C(21)-O(13) bond length is 1.25 Å. The C(21)-O(17) bond length is 1.26 Å. In the twenty-second C site, C(22) is bonded in a distorted single-bond geometry to one C(17), one C(20), and one H(2) atom. The C(22)-H(2) bond length is 0.93 Å. In the twenty-third C site, C(23) is bonded in a distorted bent 120 degrees geometry to one C(24), one O(5), and one O(8) atom. The C(23)-C(24) bond length is 1.51 Å. The C(23)-O(5) bond length is 1.27 Å. The C(23)-O(8) bond length is 1.26 Å. In the twenty-fourth C site, C(24) is bonded in a trigonal planar geometry to one C(13), one C(16), and one C(23) atom. In the twenty-fifth C site, C(25) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(11), and one O(20) atom. The C(25)-O(11) bond length is 1.26 Å. The C(25)-O(20) bond length is 1.23 Å. There are five inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(13) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(22) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(9) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(8) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(6) atom. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Sm(1) and one C(11) atom. In the second O site, O(2) is bonded in a single-bond geometry to one C(10) atom. In the third O site, O(3) is bonded in a single-bond geometry to one C(5) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Sm(2) and one C(5) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one C(23) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(7) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Sm(2) and one C(10) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one C(23) atom. In the ninth O site, O(9) is bonded in a single-bond geometry to one Sm(1) and one C(19) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one C(4) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one Cu(2) and one C(25) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one Sm(1) and one C(19) atom. In the thirteenth O site, O(13) is bonded in a single-bond geometry to one Sm(2) and one C(21) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(4) atom. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to one Sm(1) and one C(7) atom. In the sixteenth O site, O(16) is bonded in a distorted linear geometry to one Sm(2) and one C(12) atom. In the seventeenth O site, O(17) is bonded in a distorted single-bond geometry to one Sm(2) and one C(21) atom. In the eighteenth O site, O(18) is bonded in a distorted single-bond geometry to one Cu(2) and one C(12) atom. In the nineteenth O site, O(19) is bonded in a distorted water-like geometry to one Cu(1) and one C(11) atom. In the twentieth O site, O(20) is bonded in a single-bond geometry to one C(25) atom. Linkers: 2 [O]C(=O)c1cc([C]=O)c(C([O])=O)cc1[C]=O ,8 [O]C(=O)c1cc(C([O])=O)c(C([O])=O)cc1C([O])=O. Metal clusters: 4 O=[C]O[Cu]1O[C]O[Sm]2(O[C]O1)O[C]O2 ,4 O=[C]O[Cu]1O[C]O[Sm]2(O[C]=O)(O[C]O1)O[C]O2. The MOF has largest included sphere 6.55 A, density 1.44 g/cm3, surface area 3109.53 m2/g, accessible volume 0.39 cm3/g