CaCd2H18(C8O5)3 crystallizes in the triclinic P-1 space group. Ca(1) is bonded in a pentagonal bipyramidal geometry to one O(1), one O(10), one O(11), one O(14), one O(15), one O(2), and one O(7) atom. The Ca(1)-O(1) bond length is 2.37 Å. The Ca(1)-O(10) bond length is 2.41 Å. The Ca(1)-O(11) bond length is 2.41 Å. The Ca(1)-O(14) bond length is 2.38 Å. The Ca(1)-O(15) bond length is 2.38 Å. The Ca(1)-O(2) bond length is 2.37 Å. The Ca(1)-O(7) bond length is 2.48 Å. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(14), one O(3), one O(9), and two equivalent O(5) atoms. The Cd(1)-O(1) bond length is 2.61 Å. The Cd(1)-O(12) bond length is 2.25 Å. The Cd(1)-O(14) bond length is 2.63 Å. The Cd(1)-O(3) bond length is 2.37 Å. The Cd(1)-O(9) bond length is 2.30 Å. There is one shorter (2.35 Å) and one longer (2.42 Å) Cd(1)-O(5) bond length. In the second Cd site, Cd(2) is bonded in a 7-coordinate geometry to one O(13), one O(15), one O(2), one O(4), one O(8), and two equivalent O(6) atoms. The Cd(2)-O(13) bond length is 2.25 Å. The Cd(2)-O(15) bond length is 2.63 Å. The Cd(2)-O(2) bond length is 2.62 Å. The Cd(2)-O(4) bond length is 2.37 Å. The Cd(2)-O(8) bond length is 2.30 Å. There is one shorter (2.35 Å) and one longer (2.42 Å) Cd(2)-O(6) bond length. There are twenty-two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(11), one C(13), and one C(3) atom. The C(1)-C(11) bond length is 1.40 Å. The C(1)-C(13) bond length is 1.49 Å. The C(1)-C(3) bond length is 1.40 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(12), one C(14), and one C(4) atom. The C(2)-C(12) bond length is 1.40 Å. The C(2)-C(14) bond length is 1.49 Å. The C(2)-C(4) bond length is 1.40 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(1) and one H(1,2) atom. The C(3)-H(1,2) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(2) and one H(1,2) atom. The C(4)-H(1,2) bond length is 1.09 Å. In the fifth C site, C(5,6) is bonded in a single-bond geometry to one C(7) and one H(3,4) atom. The C(5,6)-C(7) bond length is 1.40 Å. The C(5,6)-H(3,4) bond length is 1.09 Å. In the sixth C site, C(7) is bonded in a trigonal planar geometry to one C(15); one C(5,6); and one C(9,10) atom. The C(7)-C(15) bond length is 1.50 Å. The C(7)-C(9,10) bond length is 1.40 Å. In the seventh C site, C(8) is bonded in a trigonal planar geometry to one C(16); one C(5,6); and one C(9,10) atom. The C(8)-C(16) bond length is 1.50 Å. The C(8)-C(5,6) bond length is 1.40 Å. The C(8)-C(9,10) bond length is 1.40 Å. In the eighth C site, C(9,10) is bonded in a distorted single-bond geometry to one C(7) and one H(5,6) atom. The C(9,10)-H(5,6) bond length is 1.09 Å. In the ninth C site, C(11) is bonded in a distorted single-bond geometry to one C(1) and one H(7,8) atom. The C(11)-H(7,8) bond length is 1.09 Å. In the tenth C site, C(12) is bonded in a distorted single-bond geometry to one C(2) and one H(7,8) atom. The C(12)-H(7,8) bond length is 1.09 Å. In the eleventh C site, C(13) is bonded in a bent 120 degrees geometry to one C(1), one O(1), and one O(5) atom. The C(13)-O(1) bond length is 1.28 Å. The C(13)-O(5) bond length is 1.28 Å. In the twelfth C site, C(14) is bonded in a bent 120 degrees geometry to one C(2), one O(2), and one O(6) atom. The C(14)-O(2) bond length is 1.28 Å. The C(14)-O(6) bond length is 1.28 Å. In the thirteenth C site, C(15) is bonded in a bent 120 degrees geometry to one C(7), one O(10), and one O(8) atom. The C(15)-O(10) bond length is 1.26 Å. The C(15)-O(8) bond length is 1.29 Å. In the fourteenth C site, C(16) is bonded in a bent 120 degrees geometry to one C(8), one O(11), and one O(9) atom. The C(16)-O(11) bond length is 1.26 Å. The C(16)-O(9) bond length is 1.29 Å. In the fifteenth C site, C(17) is bonded in a bent 120 degrees geometry to one C(19), one O(12), and one O(14) atom. The C(17)-C(19) bond length is 1.49 Å. The C(17)-O(12) bond length is 1.28 Å. The C(17)-O(14) bond length is 1.27 Å. In the sixteenth C site, C(18) is bonded in a bent 120 degrees geometry to one C(20), one O(13), and one O(15) atom. The C(18)-C(20) bond length is 1.49 Å. The C(18)-O(13) bond length is 1.28 Å. The C(18)-O(15) bond length is 1.27 Å. In the seventeenth C site, C(19) is bonded in a trigonal planar geometry to one C(17), one C(21), and one C(23) atom. The C(19)-C(21) bond length is 1.40 Å. The C(19)-C(23) bond length is 1.40 Å. In the eighteenth C site, C(20) is bonded in a trigonal planar geometry to one C(18), one C(22), and one C(24) atom. The C(20)-C(22) bond length is 1.40 Å. The C(20)-C(24) bond length is 1.40 Å. In the nineteenth C site, C(21) is bonded in a distorted single-bond geometry to one C(19), one C(23), and one H(9) atom. The C(21)-C(23) bond length is 1.39 Å. The C(21)-H(9) bond length is 1.09 Å. In the twentieth C site, C(22) is bonded in a distorted single-bond geometry to one C(20), one C(24), and one H(10) atom. The C(22)-C(24) bond length is 1.39 Å. The C(22)-H(10) bond length is 1.09 Å. In the twenty-first C site, C(23) is bonded in a distorted trigonal planar geometry to one C(19); one C(21); and one H(11,12) atom. The C(23)-H(11,12) bond length is 1.09 Å. In the twenty-second C site, C(24) is bonded in a distorted trigonal planar geometry to one C(20); one C(22); and one H(11,12) atom. The C(24)-H(11,12) bond length is 1.09 Å. There are thirteen inequivalent H sites. In the first H site, H(1,2) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(3,4) is bonded in a single-bond geometry to one C(5,6) atom. In the third H site, H(5,6) is bonded in a single-bond geometry to one C(9,10) atom. In the fourth H site, H(7,8) is bonded in a single-bond geometry to one C(11) atom. In the fifth H site, H(9) is bonded in a single-bond geometry to one C(21) atom. In the sixth H site, H(10) is bonded in a single-bond geometry to one C(22) atom. In the seventh H site, H(11,12) is bonded in a single-bond geometry to one C(23) atom. In the eighth H site, H(13) is bonded in a single-bond geometry to one O(3) atom. The H(13)-O(3) bond length is 0.97 Å. In the ninth H site, H(14) is bonded in a single-bond geometry to one O(4) atom. The H(14)-O(4) bond length is 0.97 Å. In the tenth H site, H(15) is bonded in a distorted linear geometry to one O(3) and one O(9) atom. The H(15)-O(3) bond length is 1.00 Å. The H(15)-O(9) bond length is 1.69 Å. In the eleventh H site, H(16) is bonded in a distorted linear geometry to one O(4) and one O(8) atom. The H(16)-O(4) bond length is 1.00 Å. The H(16)-O(8) bond length is 1.69 Å. In the twelfth H site, H(17) is bonded in a single-bond geometry to one O(7) atom. The H(17)-O(7) bond length is 0.97 Å. In the thirteenth H site, H(18) is bonded in a single-bond geometry to one O(7) atom. The H(18)-O(7) bond length is 0.97 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ca(1), one Cd(1), and one C(13) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Cd(2), and one C(14) atom. In the third O site, O(3) is bonded in a trigonal non-coplanar geometry to one Cd(1), one H(13), and one H(15) atom. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to one Cd(2), one H(14), and one H(16) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to two equivalent Cd(1) and one C(13) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to two equivalent Cd(2) and one C(14) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Ca(1), one H(17), and one H(18) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Cd(2), one C(15), and one H(16) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Cd(1), one C(16), and one H(15) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Ca(1) and one C(15) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Ca(1) and one C(16) atom. In the twelfth O site, O(12) is bonded in a water-like geometry to one Cd(1) and one C(17) atom. In the thirteenth O site, O(13) is bonded in a water-like geometry to one Cd(2) and one C(18) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Ca(1), one Cd(1), and one C(17) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Ca(1), one Cd(2), and one C(18) atom. Linkers: 6 [O]C(=O)c1ccc(C([O])=O)cc1. Metal clusters: 2 [Ca] ,4 [Cd]. The MOF has largest included sphere 6.09 A, density 1.26 g/cm3, surface area 3524.19 m2/g, accessible volume 0.41 cm3/g