ErC7H6SO8 crystallizes in the triclinic P-1 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(2), one O(7), one O(8), and one O(9) atom. The Er(1)-O(1) bond length is 2.24 Å. The Er(1)-O(10) bond length is 2.39 Å. The Er(1)-O(11) bond length is 2.34 Å. The Er(1)-O(12) bond length is 2.34 Å. The Er(1)-O(2) bond length is 2.24 Å. The Er(1)-O(7) bond length is 2.35 Å. The Er(1)-O(8) bond length is 2.35 Å. The Er(1)-O(9) bond length is 2.39 Å. In the second Er site, Er(2) is bonded in a 8-coordinate geometry to one O(13), one O(14), one O(15), one O(16), one O(3), one O(4), one O(5), and one O(6) atom. The Er(2)-O(13) bond length is 2.51 Å. The Er(2)-O(14) bond length is 2.51 Å. The Er(2)-O(15) bond length is 2.45 Å. The Er(2)-O(16) bond length is 2.45 Å. The Er(2)-O(3) bond length is 2.27 Å. The Er(2)-O(4) bond length is 2.27 Å. The Er(2)-O(5) bond length is 2.27 Å. The Er(2)-O(6) bond length is 2.27 Å. There are eleven inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(3,4); one C(9); and one S(1,2) atom. The C(1)-C(3,4) bond length is 1.39 Å. The C(1)-C(9) bond length is 1.47 Å. The C(1)-S(1,2) bond length is 1.72 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(10); one C(3,4); and one S(1,2) atom. The C(2)-C(10) bond length is 1.47 Å. The C(2)-C(3,4) bond length is 1.39 Å. The C(2)-S(1,2) bond length is 1.72 Å. In the third C site, C(3,4) is bonded in a distorted single-bond geometry to one C(1) and one H(9,10) atom. The C(3,4)-H(9,10) bond length is 1.09 Å. In the fourth C site, C(5,6) is bonded in a distorted single-bond geometry to one C(7) and one H(11) atom. The C(5,6)-C(7) bond length is 1.39 Å. The C(5,6)-H(11) bond length is 1.09 Å. In the fifth C site, C(7) is bonded in a trigonal planar geometry to one C(11); one C(5,6); and one S(1,2) atom. The C(7)-C(11) bond length is 1.47 Å. The C(7)-S(1,2) bond length is 1.72 Å. In the sixth C site, C(8) is bonded in a trigonal planar geometry to one C(12); one C(5,6); and one S(1,2) atom. The C(8)-C(12) bond length is 1.47 Å. The C(8)-C(5,6) bond length is 1.39 Å. The C(8)-S(1,2) bond length is 1.72 Å. In the seventh C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(3) atom. The C(9)-O(1) bond length is 1.27 Å. The C(9)-O(3) bond length is 1.27 Å. In the eighth C site, C(10) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(2), and one O(4) atom. The C(10)-O(2) bond length is 1.27 Å. The C(10)-O(4) bond length is 1.27 Å. In the ninth C site, C(11) is bonded in a bent 120 degrees geometry to one C(7), one O(5), and one O(7) atom. The C(11)-O(5) bond length is 1.29 Å. The C(11)-O(7) bond length is 1.27 Å. In the tenth C site, C(12) is bonded in a bent 120 degrees geometry to one C(8), one O(6), and one O(8) atom. The C(12)-O(6) bond length is 1.29 Å. The C(12)-O(8) bond length is 1.27 Å. In the eleventh C site, C(13,14) is bonded in a distorted bent 120 degrees geometry to one O(11) and one O(9) atom. The C(13,14)-O(11) bond length is 1.26 Å. The C(13,14)-O(9) bond length is 1.26 Å. There are nine 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 0.99 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(14) atom. The H(2)-O(14) bond length is 0.99 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(13) atom. The H(3)-O(13) bond length is 0.99 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 0.99 Å. In the fifth H site, H(5,6) is bonded in a single-bond geometry to one O(15) atom. The H(5,6)-O(15) bond length is 0.98 Å. In the sixth H site, H(7,8) is bonded in a single-bond geometry to one O(15) atom. The H(7,8)-O(15) bond length is 0.99 Å. In the seventh H site, H(9,10) is bonded in a single-bond geometry to one C(3,4) atom. In the eighth H site, H(11) is bonded in a single-bond geometry to one C(5,6) atom. In the ninth H site, H(12) is bonded in a single-bond geometry to one C(5,6) atom. The H(12)-C(5,6) bond length is 1.09 Å. S(1,2) is bonded in an L-shaped geometry to one C(1) and one C(7) atom. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Er(1) and one C(9) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Er(1) and one C(10) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Er(2) and one C(9) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Er(2) and one C(10) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Er(2) and one C(11) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Er(2) and one C(12) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Er(1) and one C(11) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Er(1) and one C(12) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Er(1) and one C(13,14) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Er(1) and one C(13,14) atom. The O(10)-C(13,14) bond length is 1.26 Å. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Er(1) and one C(13,14) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Er(1) and one C(13,14) atom. The O(12)-C(13,14) bond length is 1.26 Å. In the thirteenth O site, O(13) is bonded in a water-like geometry to one Er(2), one H(1), and one H(3) atom. In the fourteenth O site, O(14) is bonded in a water-like geometry to one Er(2), one H(2), and one H(4) atom. In the fifteenth O site, O(15) is bonded in a distorted water-like geometry to one Er(2); one H(5,6); and one H(7,8) atom. In the sixteenth O site, O(16) is bonded in a distorted water-like geometry to one Er(2); one H(5,6); and one H(7,8) atom. The O(16)-H(5,6) bond length is 0.98 Å. The O(16)-H(7,8) bond length is 0.99 Å. Linkers: 4 [O]C(=O)c1ccc(C([O])=O)s1 ,2 [O]C(=O)C([O])=O. Metal clusters: 4 [Er]. The MOF has largest included sphere 3.62 A, density 2.49 g/cm3, surface area 2346.64 m2/g, accessible volume 0.08 cm3/g