KC7H7SO5 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(9), two equivalent O(5), and two equivalent O(7) atoms. The K(1)-O(1) bond length is 2.86 Å. The K(1)-O(3) bond length is 2.77 Å. The K(1)-O(9) bond length is 2.89 Å. There is one shorter (2.83 Å) and one longer (2.85 Å) K(1)-O(5) bond length. There is one shorter (2.63 Å) and one longer (2.89 Å) K(1)-O(7) bond length. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(4), two equivalent O(6), and two equivalent O(8) atoms. The K(2)-O(10) bond length is 2.89 Å. The K(2)-O(2) bond length is 2.87 Å. The K(2)-O(4) bond length is 2.77 Å. There is one shorter (2.83 Å) and one longer (2.86 Å) K(2)-O(6) bond length. There is one shorter (2.63 Å) and one longer (2.89 Å) K(2)-O(8) bond length. There are twelve inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(11), one C(3), and one S(1) atom. The C(1)-C(11) bond length is 1.40 Å. The C(1)-C(3) bond length is 1.40 Å. The C(1)-S(1) bond length is 1.77 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(12), one C(4), and one S(2) atom. The C(2)-C(12) bond length is 1.40 Å. The C(2)-C(4) bond length is 1.40 Å. The C(2)-S(2) bond length is 1.77 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(1); one C(5); and one H(3,4) atom. The C(3)-C(5) bond length is 1.39 Å. The C(3)-H(3,4) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(2); one C(6); and one H(3,4) atom. The C(4)-C(6) bond length is 1.39 Å. The C(4)-H(3,4) bond length is 1.09 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(3) and one O(1) atom. The C(5)-O(1) bond length is 1.36 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(4) and one O(2) atom. The C(6)-O(2) bond length is 1.36 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(9,10) and one O(3) atom. The C(7)-C(9,10) bond length is 1.40 Å. The C(7)-O(3) bond length is 1.36 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to one C(9,10) and one O(4) atom. The C(8)-C(9,10) bond length is 1.40 Å. The C(8)-O(4) bond length is 1.36 Å. In the ninth C site, C(9,10) is bonded in a distorted trigonal planar geometry to one C(11); one C(7); and one H(5,6) atom. The C(9,10)-C(11) bond length is 1.40 Å. The C(9,10)-H(5,6) bond length is 1.09 Å. In the tenth C site, C(11) is bonded in a distorted trigonal planar geometry to one C(1); one C(9,10); and one H(7,8) atom. The C(11)-H(7,8) bond length is 1.09 Å. In the eleventh C site, C(12) is bonded in a distorted trigonal planar geometry to one C(2); one C(9,10); and one H(7,8) atom. The C(12)-C(9,10) bond length is 1.40 Å. The C(12)-H(7,8) bond length is 1.09 Å. In the twelfth C site, C(13,14) is bonded in a tetrahedral geometry to one H(11,12); one H(13,14); one H(9,10); and one O(1) atom. The C(13,14)-H(11,12) bond length is 1.10 Å. The C(13,14)-H(13,14) bond length is 1.09 Å. The C(13,14)-H(9,10) bond length is 1.10 Å. The C(13,14)-O(1) bond length is 1.44 Å. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a distorted linear geometry to one O(10) and one O(3) atom. The H(1)-O(10) bond length is 1.62 Å. The H(1)-O(3) bond length is 1.01 Å. In the second H site, H(2) is bonded in a distorted linear geometry to one O(4) and one O(9) atom. The H(2)-O(4) bond length is 1.01 Å. The H(2)-O(9) bond length is 1.62 Å. In the third H site, H(3,4) is bonded in a single-bond geometry to one C(3) atom. In the fourth H site, H(5,6) is bonded in a single-bond geometry to one C(9,10) atom. In the fifth H site, H(7,8) is bonded in a single-bond geometry to one C(11) atom. In the sixth H site, H(9,10) is bonded in a single-bond geometry to one C(13,14) atom. In the seventh H site, H(11,12) is bonded in a single-bond geometry to one C(13,14) atom. In the eighth H site, H(13,14) is bonded in a single-bond geometry to one C(13,14) atom. There are two inequivalent S sites. In the first S site, S(1) is bonded in a distorted trigonal non-coplanar geometry to one C(1), one O(5), one O(7), and one O(9) atom. The S(1)-O(5) bond length is 1.47 Å. The S(1)-O(7) bond length is 1.47 Å. The S(1)-O(9) bond length is 1.48 Å. In the second S site, S(2) is bonded in a distorted trigonal non-coplanar geometry to one C(2), one O(10), one O(6), and one O(8) atom. The S(2)-O(10) bond length is 1.48 Å. The S(2)-O(6) bond length is 1.47 Å. The S(2)-O(8) bond length is 1.47 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one K(1); one C(13,14); and one C(5) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one K(2); one C(13,14); and one C(6) atom. The O(2)-C(13,14) bond length is 1.44 Å. In the third O site, O(3) is bonded in a distorted water-like geometry to one K(1), one C(7), and one H(1) atom. In the fourth O site, O(4) is bonded in a distorted water-like geometry to one K(2), one C(8), and one H(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to two equivalent K(1) and one S(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent K(2) and one S(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to two equivalent K(1) and one S(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent K(2) and one S(2) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one K(1), one H(2), and one S(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one K(2), one H(1), and one S(2) atom. Linkers: 4 COc1cc(S([O])([O])[O])ccc1O. Metal clusters: 4 [K]. The MOF has largest included sphere 1.99 A, density 1.65 g/cm3, surface area 3044.04 m2/g, accessible volume 0.05 cm3/g