CuC18H7O5Cl crystallizes in the trigonal R32 space group. Cu(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Cu(1)-O(1) bond length is 1.93 Å. The Cu(1)-O(2) bond length is 1.97 Å. The Cu(1)-O(3) bond length is 1.97 Å. The Cu(1)-O(4) bond length is 1.97 Å. There are eighteen inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.53 Å. The C(1)-O(1) bond length is 1.23 Å. The C(1)-O(2) bond length is 1.27 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 1.43 Å. The C(2)-C(8) bond length is 1.37 Å. In the third C site, C(9) is bonded in a trigonal planar geometry to one C(10), one C(14), and one C(7) atom. The C(9)-C(10) bond length is 1.39 Å. The C(9)-C(14) bond length is 1.39 Å. The C(9)-C(7) bond length is 1.49 Å. In the fourth C site, C(10) is bonded in a distorted single-bond geometry to one C(11), one C(9), and one H(4) atom. The C(10)-C(11) bond length is 1.39 Å. The C(10)-H(4) bond length is 0.93 Å. In the fifth C site, C(11) is bonded in a distorted trigonal planar geometry to one C(10), one C(12), and one O(5) atom. The C(11)-C(12) bond length is 1.39 Å. The C(11)-O(5) bond length is 1.50 Å. In the sixth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(6) atom. The C(4)-C(3) bond length is 1.34 Å. The C(4)-C(5) bond length is 1.45 Å. The C(4)-C(6) bond length is 1.49 Å. In the seventh C site, C(5) is bonded in a bent 120 degrees geometry to one C(4), one O(3), and one O(4) atom. The C(5)-O(3) bond length is 1.17 Å. The C(5)-O(4) bond length is 1.33 Å. In the eighth C site, C(6) is bonded in a distorted single-bond geometry to one C(4), one C(7), and one H(2) atom. The C(6)-C(7) bond length is 1.36 Å. The C(6)-H(2) bond length is 0.93 Å. In the ninth C site, C(7) is bonded in a trigonal planar geometry to one C(6), one C(8), and one C(9) atom. The C(7)-C(8) bond length is 1.41 Å. In the tenth C site, C(8) is bonded in a distorted single-bond geometry to one C(2), one C(7), and one H(3) atom. The C(8)-H(3) bond length is 0.93 Å. In the eleventh C site, C(12) is bonded in a trigonal planar geometry to one C(11), one C(12), and one C(13) atom. The C(12)-C(12) bond length is 1.57 Å. The C(12)-C(13) bond length is 1.39 Å. In the twelfth C site, C(13) is bonded in a trigonal planar geometry to one C(12), one C(14), and one C(18) atom. The C(13)-C(14) bond length is 1.39 Å. The C(13)-C(18) bond length is 1.39 Å. In the thirteenth C site, C(14) is bonded in a trigonal planar geometry to one C(13), one C(15), and one C(9) atom. The C(14)-C(15) bond length is 1.39 Å. In the fourteenth C site, C(15) is bonded in a single-bond geometry to one C(14), one C(16), and one H(5) atom. The C(15)-C(16) bond length is 1.39 Å. The C(15)-H(5) bond length is 0.93 Å. In the fifteenth C site, C(16) is bonded in a trigonal planar geometry to one C(15), one C(17), and one Cl(1) atom. The C(16)-C(17) bond length is 1.39 Å. The C(16)-Cl(1) bond length is 1.93 Å. In the sixteenth C site, C(17) is bonded in a distorted trigonal planar geometry to one C(16), one C(18), and one H(6) atom. The C(17)-C(18) bond length is 1.39 Å. The C(17)-H(6) bond length is 0.93 Å. In the seventeenth C site, C(18) is bonded in a distorted single-bond geometry to one C(13), one C(17), and one H(7) atom. The C(18)-H(7) bond length is 0.93 Å. In the eighteenth C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one C(4), and one H(1) atom. The C(3)-H(1) bond length is 0.93 Å. There are seven 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 C(8) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(10) 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. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(18) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cu(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cu(1) and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cu(1) and one C(5) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Cu(1) and one C(5) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one C(11) atom. Cl(1) is bonded in a single-bond geometry to one C(16) atom. Linkers: 3 [O]C(=O)c1cc(C([O])=O)cc(-c2cc([O])c(-c3c([O])cc(-c4cc(C([O])=O)cc(C([O])=O)c4)c4cc(Cl)ccc34)c3ccc(Cl)cc23)c1 ,6 [O][C]c1cc([C]=O)cc(-c2cc([O])c(-c3c([O])cc(-c4cc(C([O])=O)cc(C([O])=O)c4)c4cc(Cl)ccc34)c3ccc(Cl)cc23)c1. Metal clusters: 3 [C]1O[Cu]234O[C]O[Cu]2(O1)(O[C]O3)O[C]O4. The MOF has largest included sphere 12.81 A, density 0.77 g/cm3, surface area 4088.35 m2/g, accessible volume 0.86 cm3/g