Tm2C18H6(SO4)3 crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(9) atom. The Tm(1)-O(1) bond length is 2.20 Å. The Tm(1)-O(2) bond length is 2.29 Å. The Tm(1)-O(3) bond length is 2.34 Å. The Tm(1)-O(4) bond length is 2.33 Å. The Tm(1)-O(5) bond length is 2.18 Å. The Tm(1)-O(9) bond length is 2.30 Å. In the second Tm site, Tm(2) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(12), one O(6), one O(7), and one O(8) atom. The Tm(2)-O(10) bond length is 2.23 Å. The Tm(2)-O(11) bond length is 2.36 Å. The Tm(2)-O(12) bond length is 2.26 Å. The Tm(2)-O(6) bond length is 2.23 Å. The Tm(2)-O(7) bond length is 2.35 Å. The Tm(2)-O(8) bond length is 2.29 Å. There are eighteen inequivalent C sites. In the first C site, C(1) is bonded in a bent 120 degrees geometry to one C(5), one O(3), and one O(6) atom. The C(1)-C(5) bond length is 1.49 Å. The C(1)-O(3) bond length is 1.25 Å. The C(1)-O(6) bond length is 1.27 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(5), and one O(7) atom. The C(2)-C(3) bond length is 1.48 Å. The C(2)-O(5) bond length is 1.24 Å. The C(2)-O(7) bond length is 1.27 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one S(2) atom. The C(3)-C(4) bond length is 1.37 Å. The C(3)-S(2) bond length is 1.72 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3) and one H(1) atom. The C(4)-H(1) bond length is 0.93 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(1), one C(8), and one S(1) atom. The C(5)-C(8) bond length is 1.36 Å. The C(5)-S(1) bond length is 1.73 Å. In the sixth C site, C(6) is bonded in a bent 120 degrees geometry to one C(11), one O(10), and one O(4) atom. The C(6)-C(11) bond length is 1.48 Å. The C(6)-O(10) bond length is 1.26 Å. The C(6)-O(4) bond length is 1.25 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(14), one O(8), and one O(9) atom. The C(7)-C(14) bond length is 1.49 Å. The C(7)-O(8) bond length is 1.27 Å. The C(7)-O(9) bond length is 1.26 Å. In the eighth C site, C(8) is bonded in a single-bond geometry to one C(5) and one H(2) atom. The C(8)-H(2) bond length is 0.93 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one C(12), one C(13), and one S(3) atom. The C(9)-C(12) bond length is 1.47 Å. The C(9)-C(13) bond length is 1.38 Å. The C(9)-S(3) bond length is 1.71 Å. In the tenth C site, C(10) is bonded in a distorted single-bond geometry to one C(11) and one H(3) atom. The C(10)-C(11) bond length is 1.35 Å. The C(10)-H(3) bond length is 0.93 Å. In the eleventh C site, C(11) is bonded in a trigonal planar geometry to one C(10), one C(6), and one S(1) atom. The C(11)-S(1) bond length is 1.73 Å. In the twelfth C site, C(12) is bonded in a bent 120 degrees geometry to one C(9), one O(1), and one O(11) atom. The C(12)-O(1) bond length is 1.28 Å. The C(12)-O(11) bond length is 1.25 Å. In the thirteenth C site, C(13) is bonded in a distorted single-bond geometry to one C(9) and one H(4) atom. The C(13)-H(4) bond length is 0.93 Å. In the fourteenth C site, C(14) is bonded in a trigonal planar geometry to one C(15), one C(7), and one S(2) atom. The C(14)-C(15) bond length is 1.36 Å. The C(14)-S(2) bond length is 1.71 Å. In the fifteenth C site, C(15) is bonded in a distorted single-bond geometry to one C(14) and one H(5) atom. The C(15)-H(5) bond length is 0.93 Å. In the sixteenth C site, C(16) is bonded in a trigonal planar geometry to one C(17), one C(18), and one S(3) atom. The C(16)-C(17) bond length is 1.36 Å. The C(16)-C(18) bond length is 1.49 Å. The C(16)-S(3) bond length is 1.73 Å. In the seventeenth C site, C(17) is bonded in a distorted single-bond geometry to one C(16) and one H(6) atom. The C(17)-H(6) bond length is 0.93 Å. In the eighteenth C site, C(18) is bonded in a distorted bent 120 degrees geometry to one C(16), one O(12), and one O(2) atom. The C(18)-O(12) bond length is 1.27 Å. The C(18)-O(2) bond length is 1.25 Å. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(8) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(10) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(13) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(15) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(17) atom. There are three inequivalent S sites. In the first S site, S(1) is bonded in an L-shaped geometry to one C(11) and one C(5) atom. In the second S site, S(2) is bonded in an L-shaped geometry to one C(14) and one C(3) atom. In the third S site, S(3) is bonded in an L-shaped geometry to one C(16) and one C(9) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Tm(1) and one C(12) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Tm(1) and one C(18) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Tm(1) and one C(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Tm(1) and one C(6) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Tm(1) and one C(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Tm(2) and one C(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Tm(2) and one C(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Tm(2) and one C(7) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Tm(1) and one C(7) atom. In the tenth O site, O(10) is bonded in a linear geometry to one Tm(2) and one C(6) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one Tm(2) and one C(12) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Tm(2) and one C(18) atom. Linkers: 12 [O]C(=O)c1ccc(C([O])=O)s1. Metal clusters: 8 [Tm]. The MOF has largest included sphere 5.45 A, density 1.85 g/cm3, surface area 2556.05 m2/g, accessible volume 0.27 cm3/g