SmH6(C3O4)2(CH)2 crystallizes in the monoclinic P2_1 space group. The structure consists of eight 02329_fluka molecules inside a SmH6(C3O4)2 framework. In the SmH6(C3O4)2 framework, there are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 9-coordinate geometry to one O(1), one O(12), one O(13), one O(14), one O(2), one O(5), one O(7), one O(8), and one O(9) atom. The Sm(1)-O(1) bond length is 2.49 Å. The Sm(1)-O(12) bond length is 2.39 Å. The Sm(1)-O(13) bond length is 2.56 Å. The Sm(1)-O(14) bond length is 2.49 Å. The Sm(1)-O(2) bond length is 2.57 Å. The Sm(1)-O(5) bond length is 2.40 Å. The Sm(1)-O(7) bond length is 2.59 Å. The Sm(1)-O(8) bond length is 2.46 Å. The Sm(1)-O(9) bond length is 2.37 Å. In the second Sm site, Sm(2) is bonded in a 9-coordinate geometry to one O(10), one O(11), one O(12), one O(15), one O(16), one O(3), one O(4), one O(6), and one O(7) atom. The Sm(2)-O(10) bond length is 2.38 Å. The Sm(2)-O(11) bond length is 2.51 Å. The Sm(2)-O(12) bond length is 2.76 Å. The Sm(2)-O(15) bond length is 2.50 Å. The Sm(2)-O(16) bond length is 2.49 Å. The Sm(2)-O(3) bond length is 2.48 Å. The Sm(2)-O(4) bond length is 2.49 Å. The Sm(2)-O(6) bond length is 2.39 Å. The Sm(2)-O(7) bond length is 2.37 Å. There are twelve inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(6), and one C(7) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(6) bond length is 1.40 Å. The C(1)-C(7) bond length is 1.49 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(1), one C(3), and one H(9) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-H(9) bond length is 1.09 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(10) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-H(10) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(8) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-C(8) bond length is 1.49 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one C(6), and one H(11) atom. The C(5)-C(6) bond length is 1.39 Å. The C(5)-H(11) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(1), one C(5), and one H(12) atom. The C(6)-H(12) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(7)-O(1) bond length is 1.28 Å. The C(7)-O(2) bond length is 1.28 Å. In the eighth C site, C(8) is bonded in a bent 120 degrees geometry to one C(4), one O(3), and one O(4) atom. The C(8)-O(3) bond length is 1.29 Å. The C(8)-O(4) bond length is 1.27 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. The C(9)-O(5) bond length is 1.27 Å. The C(9)-O(6) bond length is 1.28 Å. In the tenth C site, C(12) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. The C(12)-O(7) bond length is 1.29 Å. The C(12)-O(8) bond length is 1.27 Å. In the eleventh C site, C(13) is bonded in a distorted bent 120 degrees geometry to one O(10) and one O(9) atom. The C(13)-O(10) bond length is 1.28 Å. The C(13)-O(9) bond length is 1.27 Å. In the twelfth C site, C(16) is bonded in a distorted bent 120 degrees geometry to one O(11) and one O(12) atom. The C(16)-O(11) bond length is 1.28 Å. The C(16)-O(12) bond length is 1.28 Å. There are twelve inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(13) atom. The H(1)-O(13) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(13) atom. The H(2)-O(13) bond length is 0.98 Å. In the third H site, H(3) is bonded in a distorted linear geometry to one O(14) and one O(3) atom. The H(3)-O(14) bond length is 1.01 Å. The H(3)-O(3) bond length is 1.60 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(14) atom. The H(4)-O(14) bond length is 0.97 Å. In the fifth H site, H(5) is bonded in a distorted single-bond geometry to one O(11) and one O(15) atom. The H(5)-O(11) bond length is 1.67 Å. The H(5)-O(15) bond length is 1.00 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(15) atom. The H(6)-O(15) bond length is 0.97 Å. In the seventh H site, H(7) is bonded in a distorted single-bond geometry to one O(16) and one O(2) atom. The H(7)-O(16) bond length is 1.01 Å. The H(7)-O(2) bond length is 1.63 Å. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(16) atom. The H(8)-O(16) bond length is 0.97 Å. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(2) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(3) atom. In the eleventh H site, H(11) is bonded in a single-bond geometry to one C(5) atom. In the twelfth H site, H(12) is bonded in a single-bond geometry to one C(6) atom. There are sixteen 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(7) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Sm(1), one C(7), and one H(7) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sm(2), one C(8), and one H(3) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Sm(2) and one C(8) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Sm(1) and one C(9) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Sm(2) and one C(9) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Sm(1), one Sm(2), and one C(12) atom. In the eighth O site, O(8) is bonded in a distorted water-like geometry to one Sm(1) and one C(12) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one Sm(1) and one C(13) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Sm(2) and one C(13) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one Sm(2), one C(16), and one H(5) atom. In the twelfth O site, O(12) is bonded in a 1-coordinate geometry to one Sm(1), one Sm(2), and one C(16) atom. In the thirteenth O site, O(13) is bonded in a water-like geometry to one Sm(1), one H(1), and one H(2) atom. In the fourteenth O site, O(14) is bonded in a water-like geometry to one Sm(1), one H(3), and one H(4) atom. In the fifteenth O site, O(15) is bonded in a water-like geometry to one Sm(2), one H(5), and one H(6) atom. In the sixteenth O site, O(16) is bonded in a water-like geometry to one Sm(2), one H(7), and one H(8) atom. Linkers: 2 [O]C(=O)c1ccc(C([O])=O)cc1 ,4 [O]C(=O)/C=C/C([O])=O. Metal clusters: 2 O.O.O.O.O=[C]O[Sm]12(O[C]=O)O[C]O[Sm]3(O[C]O3)(O[C]O1)O[C]O2. RCSR code: pcu. The MOF has largest included sphere 2.87 A, density 2.26 g/cm3, surface area 2943.06 m2/g, accessible volume 0.09 cm3/g