Cd4C18P6H26O19 crystallizes in the triclinic P-1 space group. There are four inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to one H(25), one O(13), one O(18), one O(3), one O(6), and one O(7) atom to form CdHO5 octahedra that share  a cornercorner with one Cd(2)HO5 octahedra,  a cornercorner with one P(1)CO3 tetrahedra,  a cornercorner with one P(2)CO3 tetrahedra,  a cornercorner with one P(3)CO3 tetrahedra,  a cornercorner with one P(5)CO3 tetrahedra,  a cornercorner with one P(6)CO3 tetrahedra,  a cornercorner with one Cd(4)O5 trigonal bipyramid, and  an edgeedge with one Cd(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 43°. The Cd(1)-H(25) bond length is 1.88 Å. The Cd(1)-O(13) bond length is 2.40 Å. The Cd(1)-O(18) bond length is 2.30 Å. The Cd(1)-O(3) bond length is 2.30 Å. The Cd(1)-O(6) bond length is 2.46 Å. The Cd(1)-O(7) bond length is 2.28 Å. In the second Cd site, Cd(2) is bonded to one H(25), one O(14), one O(17), one O(4), one O(5), and one O(8) atom to form CdHO5 octahedra that share  a cornercorner with one Cd(1)HO5 octahedra,  a cornercorner with one P(1)CO3 tetrahedra,  a cornercorner with one P(2)CO3 tetrahedra,  a cornercorner with one P(4)CO3 tetrahedra,  a cornercorner with one P(5)CO3 tetrahedra,  a cornercorner with one P(6)CO3 tetrahedra,  a cornercorner with one Cd(3)O5 trigonal bipyramid, and  an edgeedge with one Cd(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 43°. The Cd(2)-H(25) bond length is 1.86 Å. The Cd(2)-O(14) bond length is 2.51 Å. The Cd(2)-O(17) bond length is 2.34 Å. The Cd(2)-O(4) bond length is 2.35 Å. The Cd(2)-O(5) bond length is 2.46 Å. The Cd(2)-O(8) bond length is 2.23 Å. In the third Cd site, Cd(3) is bonded to one O(10), one O(14), one O(15), one O(3), and one O(6) atom to form CdO5 trigonal bipyramids that share  a cornercorner with one Cd(2)HO5 octahedra,  a cornercorner with one P(1)CO3 tetrahedra,  a cornercorner with one P(2)CO3 tetrahedra,  a cornercorner with one P(4)CO3 tetrahedra,  a cornercorner with one P(5)CO3 tetrahedra,  a cornercorner with one P(6)CO3 tetrahedra, and  an edgeedge with one Cd(1)HO5 octahedra. The corner-sharing octahedral tilt angles are 73°. The Cd(3)-O(10) bond length is 2.21 Å. The Cd(3)-O(14) bond length is 2.26 Å. The Cd(3)-O(15) bond length is 2.36 Å. The Cd(3)-O(3) bond length is 2.33 Å. The Cd(3)-O(6) bond length is 2.22 Å. In the fourth Cd site, Cd(4) is bonded to one O(13), one O(16), one O(4), one O(5), and one O(9) atom to form distorted CdO5 trigonal bipyramids that share  a cornercorner with one Cd(1)HO5 octahedra,  a cornercorner with one P(1)CO3 tetrahedra,  a cornercorner with one P(2)CO3 tetrahedra,  a cornercorner with one P(3)CO3 tetrahedra,  a cornercorner with one P(5)CO3 tetrahedra,  a cornercorner with one P(6)CO3 tetrahedra, and  an edgeedge with one Cd(2)HO5 octahedra. The corner-sharing octahedral tilt angles are 69°. The Cd(4)-O(13) bond length is 2.44 Å. The Cd(4)-O(16) bond length is 2.25 Å. The Cd(4)-O(4) bond length is 2.35 Å. The Cd(4)-O(5) bond length is 2.31 Å. The Cd(4)-O(9) bond length is 2.19 Å. There are eighteen 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 1.50 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 1.50 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), one C(5), and one H(1) atom. The C(3)-C(5) 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 distorted single-bond geometry to one C(2), one C(6), and one H(2) atom. The C(4)-C(6) bond length is 1.40 Å. The C(4)-H(2) bond length is 1.09 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(17), one C(3), and one C(7) atom. The C(5)-C(17) bond length is 1.52 Å. The C(5)-C(7) bond length is 1.40 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(18), one C(4), and one C(8) atom. The C(6)-C(18) bond length is 1.52 Å. The C(6)-C(8) bond length is 1.40 Å. In the seventh C site, C(7) is bonded in a distorted trigonal planar geometry to one C(5), one C(9), and one H(3) atom. The C(7)-C(9) bond length is 1.40 Å. The C(7)-H(3) bond length is 1.09 Å. In the eighth C site, C(8) is bonded in a distorted trigonal planar geometry to one C(10), one C(6), and one H(4) atom. The C(8)-C(10) bond length is 1.40 Å. The C(8)-H(4) bond length is 1.09 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one C(11), one C(15), and one C(7) atom. The C(9)-C(11) bond length is 1.40 Å. The C(9)-C(15) bond length is 1.50 Å. In the tenth C site, C(10) is bonded in a trigonal planar geometry to one C(12), one C(16), and one C(8) atom. The C(10)-C(12) bond length is 1.40 Å. The C(10)-C(16) bond length is 1.51 Å. In the eleventh C site, C(11) is bonded in a distorted trigonal planar geometry to one C(1), one C(9), and one H(5) atom. The C(11)-H(5) bond length is 1.09 Å. In the twelfth C site, C(12) is bonded in a distorted single-bond geometry to one C(10), one C(2), and one H(6) atom. The C(12)-H(6) bond length is 1.09 Å. In the thirteenth C site, C(13) is bonded in a distorted water-like geometry to one C(1), one P(1), one H(7), and one H(9) atom. The C(13)-P(1) bond length is 1.80 Å. The C(13)-H(7) bond length is 1.10 Å. The C(13)-H(9) bond length is 1.09 Å. In the fourteenth C site, C(14) is bonded in a distorted water-like geometry to one C(2), one P(2), one H(10), and one H(8) atom. The C(14)-P(2) bond length is 1.80 Å. The C(14)-H(10) bond length is 1.10 Å. The C(14)-H(8) bond length is 1.10 Å. In the fifteenth C site, C(15) is bonded in a distorted water-like geometry to one C(9), one P(3), one H(11), and one H(13) atom. The C(15)-P(3) bond length is 1.82 Å. The C(15)-H(11) bond length is 1.10 Å. The C(15)-H(13) bond length is 1.10 Å. In the sixteenth C site, C(16) is bonded in a distorted water-like geometry to one C(10), one P(4), one H(12), and one H(14) atom. The C(16)-P(4) bond length is 1.83 Å. The C(16)-H(12) bond length is 1.10 Å. The C(16)-H(14) bond length is 1.10 Å. In the seventeenth C site, C(17) is bonded in a distorted water-like geometry to one C(5), one P(5), one H(15), and one H(17) atom. The C(17)-P(5) bond length is 1.81 Å. The C(17)-H(15) bond length is 1.10 Å. The C(17)-H(17) bond length is 1.10 Å. In the eighteenth C site, C(18) is bonded in a distorted water-like geometry to one C(6), one P(6), one H(16), and one H(18) atom. The C(18)-P(6) bond length is 1.82 Å. The C(18)-H(16) bond length is 1.10 Å. The C(18)-H(18) bond length is 1.10 Å. There are six inequivalent P sites. In the first P site, P(1) is bonded to one C(13), one O(1), one O(3), and one O(5) atom to form PCO3 tetrahedra that share  a cornercorner with one Cd(1)HO5 octahedra,  a cornercorner with one Cd(2)HO5 octahedra,  a cornercorner with one Cd(3)O5 trigonal bipyramid, and  a cornercorner with one Cd(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 49-50°. The P(1)-O(1) bond length is 1.58 Å. The P(1)-O(3) bond length is 1.55 Å. The P(1)-O(5) bond length is 1.53 Å. In the second P site, P(2) is bonded to one C(14), one O(2), one O(4), and one O(6) atom to form PCO3 tetrahedra that share  a cornercorner with one Cd(1)HO5 octahedra,  a cornercorner with one Cd(2)HO5 octahedra,  a cornercorner with one Cd(3)O5 trigonal bipyramid, and  a cornercorner with one Cd(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 49-53°. The P(2)-O(2) bond length is 1.58 Å. The P(2)-O(4) bond length is 1.54 Å. The P(2)-O(6) bond length is 1.54 Å. In the third P site, P(3) is bonded to one C(15), one O(11), one O(7), and one O(9) atom to form distorted PCO3 tetrahedra that share  a cornercorner with one Cd(1)HO5 octahedra and  a cornercorner with one Cd(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 6°. The P(3)-O(11) bond length is 1.61 Å. The P(3)-O(7) bond length is 1.51 Å. The P(3)-O(9) bond length is 1.54 Å. In the fourth P site, P(4) is bonded to one C(16), one O(10), one O(12), and one O(8) atom to form distorted PCO3 tetrahedra that share  a cornercorner with one Cd(2)HO5 octahedra and  a cornercorner with one Cd(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 36°. The P(4)-O(10) bond length is 1.55 Å. The P(4)-O(12) bond length is 1.59 Å. The P(4)-O(8) bond length is 1.51 Å. In the fifth P site, P(5) is bonded to one C(17), one O(13), one O(15), and one O(17) atom to form distorted PCO3 tetrahedra that share  a cornercorner with one Cd(1)HO5 octahedra,  a cornercorner with one Cd(2)HO5 octahedra,  a cornercorner with one Cd(3)O5 trigonal bipyramid, and  a cornercorner with one Cd(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 54-55°. The P(5)-O(13) bond length is 1.53 Å. The P(5)-O(15) bond length is 1.61 Å. The P(5)-O(17) bond length is 1.52 Å. In the sixth P site, P(6) is bonded to one C(18), one O(14), one O(16), and one O(18) atom to form PCO3 tetrahedra that share  a cornercorner with one Cd(1)HO5 octahedra,  a cornercorner with one Cd(2)HO5 octahedra,  a cornercorner with one Cd(3)O5 trigonal bipyramid, and  a cornercorner with one Cd(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 49-57°. The P(6)-O(14) bond length is 1.56 Å. The P(6)-O(16) bond length is 1.55 Å. The P(6)-O(18) bond length is 1.54 Å. There are twenty-six 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(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(7) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(8) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(11) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(12) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(13) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(14) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(13) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(14) atom. In the eleventh H site, H(11) is bonded in a single-bond geometry to one C(15) atom. In the twelfth H site, H(12) is bonded in a single-bond geometry to one C(16) atom. In the thirteenth H site, H(13) is bonded in a single-bond geometry to one C(15) atom. In the fourteenth H site, H(14) is bonded in a single-bond geometry to one C(16) atom. In the fifteenth H site, H(15) is bonded in a single-bond geometry to one C(17) atom. In the sixteenth H site, H(16) is bonded in a single-bond geometry to one C(18) atom. In the seventeenth H site, H(17) is bonded in a single-bond geometry to one C(17) atom. In the eighteenth H site, H(18) is bonded in a single-bond geometry to one C(18) atom. In the nineteenth H site, H(19) is bonded in a bent 150 degrees geometry to one O(1) and one O(15) atom. The H(19)-O(1) bond length is 1.56 Å. The H(19)-O(15) bond length is 1.02 Å. In the twentieth H site, H(20) is bonded in a distorted linear geometry to one O(16) and one O(2) atom. The H(20)-O(16) bond length is 1.53 Å. The H(20)-O(2) bond length is 1.03 Å. In the twenty-first H site, H(21) is bonded in a single-bond geometry to one O(11) atom. The H(21)-O(11) bond length is 1.00 Å. In the twenty-second H site, H(22) is bonded in a distorted single-bond geometry to one O(12) and one O(18) atom. The H(22)-O(12) bond length is 1.02 Å. The H(22)-O(18) bond length is 1.66 Å. In the twenty-third H site, H(23) is bonded in a linear geometry to one O(1) and one O(19) atom. The H(23)-O(1) bond length is 1.14 Å. The H(23)-O(19) bond length is 1.26 Å. In the twenty-fourth H site, H(24) is bonded in a distorted linear geometry to one O(10) and one O(19) atom. The H(24)-O(10) bond length is 1.60 Å. The H(24)-O(19) bond length is 1.02 Å. In the twenty-fifth H site, H(25) is bonded in a bent 150 degrees geometry to one Cd(1) and one Cd(2) atom. In the twenty-sixth H site, H(26) is bonded in a single-bond geometry to one O(19) atom. The H(26)-O(19) bond length is 0.99 Å. There are nineteen inequivalent O sites. In the first O site, O(11) is bonded in a bent 120 degrees geometry to one P(3) and one H(21) atom. In the second O site, O(12) is bonded in a bent 120 degrees geometry to one P(4) and one H(22) atom. In the third O site, O(13) is bonded in a distorted trigonal planar geometry to one Cd(1), one Cd(4), and one P(5) atom. In the fourth O site, O(14) is bonded in a 3-coordinate geometry to one Cd(2), one Cd(3), and one P(6) atom. In the fifth O site, O(15) is bonded in a 3-coordinate geometry to one Cd(3), one P(5), and one H(19) atom. In the sixth O site, O(16) is bonded in a 3-coordinate geometry to one Cd(4), one P(6), and one H(20) atom. In the seventh O site, O(17) is bonded in a distorted single-bond geometry to one Cd(2) and one P(5) atom. In the eighth O site, O(18) is bonded in a distorted trigonal planar geometry to one Cd(1), one P(6), and one H(22) atom. In the ninth O site, O(19) is bonded in a trigonal non-coplanar geometry to one H(23), one H(24), and one H(26) atom. In the tenth O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one P(1), one H(19), and one H(23) atom. In the eleventh O site, O(2) is bonded in a bent 120 degrees geometry to one P(2) and one H(20) atom. In the twelfth O site, O(3) is bonded in a 3-coordinate geometry to one Cd(1), one Cd(3), and one P(1) atom. In the thirteenth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cd(2), one Cd(4), and one P(2) atom. In the fourteenth O site, O(5) is bonded in a 3-coordinate geometry to one Cd(2), one Cd(4), and one P(1) atom. In the fifteenth O site, O(6) is bonded in a 3-coordinate geometry to one Cd(1), one Cd(3), and one P(2) atom. In the sixteenth O site, O(7) is bonded in a linear geometry to one Cd(1) and one P(3) atom. In the seventeenth O site, O(8) is bonded in a bent 150 degrees geometry to one Cd(2) and one P(4) atom. In the eighteenth O site, O(9) is bonded in a bent 120 degrees geometry to one Cd(4) and one P(3) atom. In the nineteenth O site, O(10) is bonded in a 3-coordinate geometry to one Cd(3), one P(4), and one H(24) atom. Linkers: 2 [O]P(=O)(O)Cc1cc(CP([O])(=O)O)cc(CP([O])(=O)O)c1 ,2 [O]P([O])(=O)Cc1cc(CP([O])(=O)O)cc(CP([O])(=O)O)c1. Metal clusters: 8 [Cd]. The MOF has largest included sphere 1.78 A, density 2.72 g/cm3, surface area 2447.69 m2/g, accessible volume 0.06 cm3/g