ErC15H12(SO3)3 crystallizes in the triclinic P-1 space group. Er(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. The Er(1)-O(1) bond length is 2.37 Å. The Er(1)-O(2) bond length is 2.41 Å. The Er(1)-O(3) bond length is 2.32 Å. The Er(1)-O(4) bond length is 2.25 Å. The Er(1)-O(5) bond length is 2.26 Å. The Er(1)-O(6) bond length is 2.29 Å. The Er(1)-O(7) bond length is 2.51 Å. The Er(1)-O(8) bond length is 2.38 Å. There are fifteen inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(1), and one O(2) atom. The C(1)-C(4) bond length is 1.47 Å. The C(1)-O(1) bond length is 1.28 Å. The C(1)-O(2) bond length is 1.28 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(4), and one O(6) atom. The C(2)-C(6) bond length is 1.47 Å. The C(2)-O(4) bond length is 1.27 Å. The C(2)-O(6) bond length is 1.28 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(8), one O(5), and one O(9) atom. The C(3)-C(8) bond length is 1.47 Å. The C(3)-O(5) bond length is 1.27 Å. The C(3)-O(9) bond length is 1.29 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(1), one C(7), and one S(1) atom. The C(4)-C(7) bond length is 1.39 Å. The C(4)-S(1) bond length is 1.73 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(5), one C(9), and one S(1) atom. The C(5)-C(5) bond length is 1.44 Å. The C(5)-C(9) bond length is 1.39 Å. The C(5)-S(1) bond length is 1.73 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(12), one C(2), and one S(2) atom. The C(6)-C(12) bond length is 1.39 Å. The C(6)-S(2) bond length is 1.73 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(4), one C(9), and one H(7) atom. The C(7)-C(9) bond length is 1.41 Å. The C(7)-H(7) bond length is 1.09 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(14), one C(3), and one S(3) atom. The C(8)-C(14) bond length is 1.39 Å. The C(8)-S(3) bond length is 1.72 Å. In the ninth C site, C(9) is bonded in a distorted single-bond geometry to one C(5), one C(7), and one H(8) atom. The C(9)-H(8) bond length is 1.09 Å. In the tenth C site, C(10) is bonded in a trigonal planar geometry to one C(11), one C(15), and one S(3) atom. The C(10)-C(11) bond length is 1.44 Å. The C(10)-C(15) bond length is 1.39 Å. The C(10)-S(3) bond length is 1.73 Å. In the eleventh C site, C(11) is bonded in a trigonal planar geometry to one C(10), one C(13), and one S(2) atom. The C(11)-C(13) bond length is 1.39 Å. The C(11)-S(2) bond length is 1.73 Å. In the twelfth C site, C(12) is bonded in a distorted single-bond geometry to one C(13), one C(6), and one H(9) atom. The C(12)-C(13) bond length is 1.40 Å. The C(12)-H(9) bond length is 1.09 Å. In the thirteenth C site, C(13) is bonded in a distorted single-bond geometry to one C(11), one C(12), and one H(10) atom. The C(13)-H(10) bond length is 1.09 Å. In the fourteenth C site, C(14) is bonded in a distorted single-bond geometry to one C(15), one C(8), and one H(11) atom. The C(14)-C(15) bond length is 1.41 Å. The C(14)-H(11) bond length is 1.09 Å. In the fifteenth C site, C(15) is bonded in a distorted single-bond geometry to one C(10), one C(14), and one H(12) atom. The C(15)-H(12) bond length is 1.09 Å. There are twelve inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) atom. The H(1)-O(3) bond length is 0.98 Å. In the second H site, H(2) is bonded in a distorted linear geometry to one O(2) and one O(3) atom. The H(2)-O(2) bond length is 1.61 Å. The H(2)-O(3) bond length is 1.00 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(7) and one O(9) atom. The H(3)-O(7) bond length is 1.00 Å. The H(3)-O(9) bond length is 1.70 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(7) atom. The H(4)-O(7) bond length is 0.98 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(8) atom. The H(5)-O(8) bond length is 0.98 Å. In the sixth H site, H(6) is bonded in a distorted linear geometry to one O(8) and one O(9) atom. The H(6)-O(8) bond length is 1.01 Å. The H(6)-O(9) bond length is 1.63 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(7) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(9) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(12) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(13) atom. In the eleventh H site, H(11) is bonded in a single-bond geometry to one C(14) atom. In the twelfth H site, H(12) is bonded in a single-bond geometry to one C(15) atom. There are three inequivalent S sites. In the first S site, S(1) is bonded in an L-shaped geometry to one C(4) and one C(5) atom. In the second S site, S(2) is bonded in an L-shaped geometry to one C(11) and one C(6) atom. In the third S site, S(3) is bonded in an L-shaped geometry to one C(10) and one C(8) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted L-shaped geometry to one Er(1) and one C(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Er(1), one C(1), and one H(2) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Er(1), one H(1), and one H(2) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Er(1) and one C(2) atom. In the fifth O site, O(5) is bonded in a distorted linear geometry to one Er(1) and one C(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Er(1) and one C(2) atom. In the seventh O site, O(7) is bonded in a water-like geometry to one Er(1), one H(3), and one H(4) atom. In the eighth O site, O(8) is bonded in a distorted water-like geometry to one Er(1), one H(5), and one H(6) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one C(3), one H(3), and one H(6) atom. Linkers: 3 [O]C(=O)c1ccc(-c2ccc(C([O])=O)s2)s1. Metal clusters: 1 O.O.O.O.O.O.[O][C]O[Er@]1(O[C]=O)O[C]O[Er@](O[C][O])(O[C]=O)O[C]O1. RCSR code: sql. The MOF has largest included sphere 1.72 A, density 2.27 g/cm3, surface area 3117.45 m2/g, accessible volume 0.09 cm3/g