K2CuC10H8O11 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 distorted pentagonal bipyramidal geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(8), and one O(9) atom. The K(1)-O(1) bond length is 2.94 Å. The K(1)-O(10) bond length is 2.65 Å. The K(1)-O(2) bond length is 3.12 Å. The K(1)-O(3) bond length is 3.02 Å. The K(1)-O(4) bond length is 2.86 Å. The K(1)-O(8) bond length is 2.77 Å. The K(1)-O(9) bond length is 2.94 Å. In the second K site, K(2) is bonded in a 11-coordinate geometry to one H(3), one H(4), one H(7), one O(1), one O(5), one O(6), one O(7), one O(8), one O(9), and two equivalent O(11) atoms. The K(2)-H(3) bond length is 3.00 Å. The K(2)-H(4) bond length is 3.05 Å. The K(2)-H(7) bond length is 2.95 Å. The K(2)-O(1) bond length is 2.65 Å. The K(2)-O(5) bond length is 2.88 Å. The K(2)-O(6) bond length is 2.87 Å. The K(2)-O(7) bond length is 3.11 Å. The K(2)-O(8) bond length is 3.20 Å. The K(2)-O(9) bond length is 3.11 Å. There is one shorter (2.72 Å) and one longer (3.16 Å) K(2)-O(11) bond length. Cu(1) is bonded in a rectangular see-saw-like geometry to one O(2), one O(4), one O(5), and one O(7) atom. The Cu(1)-O(2) bond length is 1.95 Å. The Cu(1)-O(4) bond length is 2.00 Å. The Cu(1)-O(5) bond length is 2.00 Å. The Cu(1)-O(7) bond length is 1.97 Å. There are ten inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(6), and one C(7) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(6) bond length is 1.40 Å. The C(1)-C(7) bond length is 1.50 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(8) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-C(8) bond length is 1.50 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(1) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-H(1) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(9) atom. The C(4)-C(5) bond length is 1.41 Å. The C(4)-C(9) bond length is 1.49 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(10), one C(4), and one C(6) atom. The C(5)-C(10) bond length is 1.50 Å. The C(5)-C(6) bond length is 1.40 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(1), one C(5), and one H(2) atom. The C(6)-H(2) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(7)-O(1) bond length is 1.25 Å. The C(7)-O(2) bond length is 1.30 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(3), and one O(4) atom. The C(8)-O(3) bond length is 1.27 Å. The C(8)-O(4) bond length is 1.28 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(5), and one O(6) atom. The C(9)-O(5) bond length is 1.28 Å. The C(9)-O(6) bond length is 1.27 Å. In the tenth C site, C(10) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(7), and one O(8) atom. The C(10)-O(7) bond length is 1.29 Å. The C(10)-O(8) bond length is 1.26 Å. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(6) atom. In the third H site, H(3) is bonded in a single-bond geometry to one K(2) and one O(9) atom. The H(3)-O(9) bond length is 0.99 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one K(2) and one O(9) atom. The H(4)-O(9) bond length is 0.98 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(10) atom. The H(5)-O(10) bond length is 0.98 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(10) atom. The H(6)-O(10) bond length is 0.99 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one K(2) and one O(11) atom. The H(7)-O(11) bond length is 0.99 Å. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(11) atom. The H(8)-O(11) bond length is 0.98 Å. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one C(7) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one K(1), one Cu(1), and one C(7) atom. In the third O site, O(3) is bonded in a single-bond geometry to one K(1) and one C(8) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one K(1), one Cu(1), and one C(8) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one K(2), one Cu(1), and one C(9) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(2) and one C(9) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one K(2), one Cu(1), and one C(10) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one C(10) atom. In the ninth O site, O(9) is bonded in a water-like geometry to one K(1), one K(2), one H(3), and one H(4) atom. In the tenth O site, O(10) is bonded in a distorted water-like geometry to one K(1), one H(5), and one H(6) atom. In the eleventh O site, O(11) is bonded in a water-like geometry to two equivalent K(2), one H(7), and one H(8) atom. Linkers: 2 [O]C(=O)c1cc(C([O])=O)c(C([O])=O)cc1C([O])=O. Metal clusters: 4 [K] ,2 [Cu]. The MOF has largest included sphere 3.06 A, density 1.92 g/cm3, surface area 1920.26 m2/g, accessible volume 0.06 cm3/g