SmH6(C2O3)3 crystallizes in the triclinic P-1 space group. Sm(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(7), one O(8), and two equivalent O(5) atoms. The Sm(1)-O(1) bond length is 2.41 Å. The Sm(1)-O(2) bond length is 2.52 Å. The Sm(1)-O(3) bond length is 2.60 Å. The Sm(1)-O(4) bond length is 2.46 Å. The Sm(1)-O(6) bond length is 2.37 Å. The Sm(1)-O(7) bond length is 2.41 Å. The Sm(1)-O(8) bond length is 2.49 Å. There is one shorter (2.47 Å) and one longer (2.63 Å) Sm(1)-O(5) bond length. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(6) atom. The C(1)-C(2) bond length is 1.45 Å. The C(1)-O(1) bond length is 1.27 Å. The C(1)-O(6) bond length is 1.27 Å. In the second C site, C(2) is bonded in a linear geometry to one C(1) and one C(5) atom. The C(2)-C(5) bond length is 1.22 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(8), and one O(9) atom. The C(3)-C(5) bond length is 1.45 Å. The C(3)-O(8) bond length is 1.28 Å. The C(3)-O(9) bond length is 1.27 Å. In the fourth C site, C(4) is bonded in a bent 120 degrees geometry to one C(6), one O(3), and one O(5) atom. The C(4)-C(6) bond length is 1.44 Å. The C(4)-O(3) bond length is 1.27 Å. The C(4)-O(5) bond length is 1.28 Å. In the fifth C site, C(5) is bonded in a linear geometry to one C(2) and one C(3) atom. In the sixth C site, C(6) is bonded in a linear geometry to one C(4) and one C(6) atom. The C(6)-C(6) bond length is 1.21 Å. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(2) and one O(3) atom. The H(1)-O(2) bond length is 1.00 Å. The H(1)-O(3) bond length is 1.68 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(7) atom. The H(2)-O(7) bond length is 1.00 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(7) atom. The H(3)-O(7) bond length is 0.99 Å. In the fourth H site, H(4) is bonded in a distorted single-bond geometry to one O(4) and one O(8) atom. The H(4)-O(4) bond length is 1.00 Å. The H(4)-O(8) bond length is 1.70 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(4) atom. The H(5)-O(4) bond length is 0.97 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(2) atom. The H(6)-O(2) bond length is 1.00 Å. There are nine 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 water-like geometry to one Sm(1), one H(1), and one H(6) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sm(1), one C(4), and one H(1) atom. In the fourth O site, O(4) is bonded in a distorted water-like geometry to one Sm(1), one H(4), and one H(5) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to two equivalent Sm(1) and one C(4) atom. In the sixth O site, O(6) is bonded in a linear geometry to one Sm(1) and one C(1) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Sm(1), one H(2), and one H(3) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Sm(1), one C(3), and one H(4) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one C(3) atom. Linkers: 3 [O]C(=O)C#CC([O])=O. Metal clusters: 2 [Sm]. The MOF has largest included sphere 2.98 A, density 2.43 g/cm3, surface area 2444.89 m2/g, accessible volume 0.07 cm3/g