Pb5P4H18(C7O5)4 crystallizes in the triclinic P1 space group. There are five inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 4-coordinate geometry to one O(12), one O(2), one O(20), and one O(8) atom. The Pb(1)-O(12) bond length is 2.41 Å. The Pb(1)-O(2) bond length is 2.60 Å. The Pb(1)-O(20) bond length is 2.60 Å. The Pb(1)-O(8) bond length is 2.51 Å. In the second Pb site, Pb(2) is bonded to one O(1), one O(13), one O(16), one O(19), and one O(8) atom to form distorted PbO5 square pyramids that share  a cornercorner with one Pb(5)O6 pentagonal pyramid,  a cornercorner with one P(1)CO3 tetrahedra,  a cornercorner with one P(2)CO3 tetrahedra,  a cornercorner with one P(3)CO3 tetrahedra, and  a cornercorner with one P(4)CO3 tetrahedra. The Pb(2)-O(1) bond length is 2.58 Å. The Pb(2)-O(13) bond length is 2.47 Å. The Pb(2)-O(16) bond length is 2.33 Å. The Pb(2)-O(19) bond length is 2.56 Å. The Pb(2)-O(8) bond length is 2.59 Å. In the third Pb site, Pb(3) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(13), one O(15), one O(18), one O(4), and one O(7) atom. The Pb(3)-O(1) bond length is 2.62 Å. The Pb(3)-O(12) bond length is 2.61 Å. The Pb(3)-O(13) bond length is 2.80 Å. The Pb(3)-O(15) bond length is 2.64 Å. The Pb(3)-O(18) bond length is 2.59 Å. The Pb(3)-O(4) bond length is 2.72 Å. The Pb(3)-O(7) bond length is 2.51 Å. In the fourth Pb site, Pb(4) is bonded in a 5-coordinate geometry to one O(11), one O(14), one O(18), one O(2), and one O(6) atom. The Pb(4)-O(11) bond length is 2.36 Å. The Pb(4)-O(14) bond length is 2.69 Å. The Pb(4)-O(18) bond length is 2.71 Å. The Pb(4)-O(2) bond length is 2.38 Å. The Pb(4)-O(6) bond length is 2.42 Å. In the fifth Pb site, Pb(5) is bonded to one O(11), one O(17), one O(19), one O(3), one O(6), and one O(7) atom to form distorted PbO6 pentagonal pyramids that share  a cornercorner with one Pb(2)O5 square pyramid,  a cornercorner with one P(1)CO3 tetrahedra,  a cornercorner with one P(3)CO3 tetrahedra,  a cornercorner with one P(4)CO3 tetrahedra, and  an edgeedge with one P(2)CO3 tetrahedra. The Pb(5)-O(11) bond length is 2.72 Å. The Pb(5)-O(17) bond length is 2.31 Å. The Pb(5)-O(19) bond length is 2.69 Å. The Pb(5)-O(3) bond length is 2.44 Å. The Pb(5)-O(6) bond length is 2.69 Å. The Pb(5)-O(7) bond length is 2.63 Å. There are twenty-eight 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 P(1) atom. The C(1)-C(2) bond length is 1.41 Å. The C(1)-C(6) bond length is 1.40 Å. The C(1)-P(1) bond length is 1.82 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1) and one H(2) atom. The C(2)-H(2) bond length is 1.09 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(4) and one H(3) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-H(3) 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(7) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-C(7) bond length is 1.48 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(4) and one H(4) atom. The C(5)-H(4) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(1) and one H(5) atom. The C(6)-H(5) 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(4), one O(4), and one O(5) atom. The C(7)-O(4) bond length is 1.23 Å. The C(7)-O(5) bond length is 1.35 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(13), one C(9), and one P(2) atom. The C(8)-C(13) bond length is 1.40 Å. The C(8)-C(9) bond length is 1.40 Å. The C(8)-P(2) bond length is 1.82 Å. In the ninth C site, C(9) is bonded in a distorted trigonal planar geometry to one C(10), one C(8), and one H(6) atom. The C(9)-C(10) bond length is 1.39 Å. The C(9)-H(6) bond length is 1.09 Å. In the tenth C site, C(10) is bonded in a distorted single-bond geometry to one C(11), one C(9), and one H(7) atom. The C(10)-C(11) bond length is 1.41 Å. The C(10)-H(7) bond length is 1.09 Å. In the eleventh C site, C(11) is bonded in a trigonal planar geometry to one C(10), one C(12), and one C(14) atom. The C(11)-C(12) bond length is 1.40 Å. The C(11)-C(14) bond length is 1.48 Å. In the twelfth C site, C(12) is bonded in a distorted single-bond geometry to one C(11) and one H(9) atom. The C(12)-H(9) bond length is 1.09 Å. In the thirteenth C site, C(13) is bonded in a distorted single-bond geometry to one C(8) and one H(8) atom. The C(13)-H(8) bond length is 1.09 Å. In the fourteenth C site, C(14) is bonded in a distorted bent 120 degrees geometry to one C(11), one O(10), and one O(9) atom. The C(14)-O(10) bond length is 1.22 Å. The C(14)-O(9) bond length is 1.37 Å. In the fifteenth C site, C(15) is bonded in a trigonal planar geometry to one C(16), one C(20), and one P(3) atom. The C(15)-C(16) bond length is 1.40 Å. The C(15)-C(20) bond length is 1.40 Å. The C(15)-P(3) bond length is 1.81 Å. In the sixteenth C site, C(16) is bonded in a distorted single-bond geometry to one C(15) and one H(10,13) atom. The C(16)-H(10,13) bond length is 1.09 Å. In the seventeenth C site, C(17) is bonded in a distorted single-bond geometry to one C(18) and one H(11) atom. The C(17)-C(18) bond length is 1.40 Å. The C(17)-H(11) bond length is 1.09 Å. In the eighteenth C site, C(18) is bonded in a trigonal planar geometry to one C(17), one C(19), and one C(21) atom. The C(18)-C(19) bond length is 1.40 Å. The C(18)-C(21) bond length is 1.50 Å. In the nineteenth C site, C(19) is bonded in a distorted single-bond geometry to one C(18) and one H(12) atom. The C(19)-H(12) bond length is 1.09 Å. In the twentieth C site, C(20) is bonded in a distorted single-bond geometry to one C(15) and one H(10,13) atom. The C(20)-H(10,13) bond length is 1.09 Å. In the twenty-first C site, C(21) is bonded in a distorted bent 120 degrees geometry to one C(18), one O(14), and one O(15) atom. The C(21)-O(14) bond length is 1.28 Å. The C(21)-O(15) bond length is 1.28 Å. In the twenty-second C site, C(22) is bonded in a trigonal planar geometry to one C(23), one C(27), and one P(4) atom. The C(22)-C(23) bond length is 1.40 Å. The C(22)-C(27) bond length is 1.41 Å. The C(22)-P(4) bond length is 1.82 Å. In the twenty-third C site, C(23) is bonded in a distorted single-bond geometry to one C(22) and one H(14) atom. The C(23)-H(14) bond length is 1.09 Å. In the twenty-fourth C site, C(24) is bonded in a distorted single-bond geometry to one C(25) and one H(15) atom. The C(24)-C(25) bond length is 1.40 Å. The C(24)-H(15) bond length is 1.09 Å. In the twenty-fifth C site, C(25) is bonded in a trigonal planar geometry to one C(24), one C(26), and one C(28) atom. The C(25)-C(26) bond length is 1.41 Å. The C(25)-C(28) bond length is 1.50 Å. In the twenty-sixth C site, C(26) is bonded in a distorted trigonal planar geometry to one C(25), one C(27), and one H(16) atom. The C(26)-C(27) bond length is 1.40 Å. The C(26)-H(16) bond length is 1.09 Å. In the twenty-seventh C site, C(27) is bonded in a distorted trigonal planar geometry to one C(22), one C(26), and one H(17) atom. The C(27)-H(17) bond length is 1.09 Å. In the twenty-eighth C site, C(28) is bonded in a distorted bent 120 degrees geometry to one C(25), one O(19), and one O(20) atom. The C(28)-O(19) bond length is 1.30 Å. The C(28)-O(20) bond length is 1.26 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one C(1), one O(1), one O(2), and one O(3) atom to form PCO3 tetrahedra that share  a cornercorner with one Pb(5)O6 pentagonal pyramid and  a cornercorner with one Pb(2)O5 square pyramid. The P(1)-O(1) bond length is 1.54 Å. The P(1)-O(2) bond length is 1.55 Å. The P(1)-O(3) bond length is 1.54 Å. In the second P site, P(2) is bonded to one C(8), one O(6), one O(7), and one O(8) atom to form PCO3 tetrahedra that share  a cornercorner with one Pb(2)O5 square pyramid and  an edgeedge with one Pb(5)O6 pentagonal pyramid. The P(2)-O(6) bond length is 1.55 Å. The P(2)-O(7) bond length is 1.54 Å. The P(2)-O(8) bond length is 1.53 Å. In the third P site, P(3) is bonded to one C(15), one O(11), one O(12), and one O(13) atom to form PCO3 tetrahedra that share  a cornercorner with one Pb(5)O6 pentagonal pyramid and  a cornercorner with one Pb(2)O5 square pyramid. The P(3)-O(11) bond length is 1.55 Å. The P(3)-O(12) bond length is 1.55 Å. The P(3)-O(13) bond length is 1.54 Å. In the fourth P site, P(4) is bonded to one C(22), one O(16), one O(17), and one O(18) atom to form PCO3 tetrahedra that share  a cornercorner with one Pb(5)O6 pentagonal pyramid and  a cornercorner with one Pb(2)O5 square pyramid. The P(4)-O(16) bond length is 1.54 Å. The P(4)-O(17) bond length is 1.55 Å. The P(4)-O(18) bond length is 1.54 Å. There are seventeen inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. The H(1)-O(5) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one C(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(3) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(5) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(6) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(9) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(10) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(13) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(12) atom. In the tenth H site, H(10,13) is bonded in a single-bond geometry to one C(16) atom. In the eleventh H site, H(11) is bonded in a single-bond geometry to one C(17) atom. In the twelfth H site, H(12) is bonded in a single-bond geometry to one C(19) atom. In the thirteenth H site, H(14) is bonded in a single-bond geometry to one C(23) atom. In the fourteenth H site, H(15) is bonded in a single-bond geometry to one C(24) atom. In the fifteenth H site, H(16) is bonded in a single-bond geometry to one C(26) atom. In the sixteenth H site, H(17) is bonded in a single-bond geometry to one C(27) atom. In the seventeenth H site, H(18) is bonded in a single-bond geometry to one O(9) atom. The H(18)-O(9) bond length is 0.98 Å. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Pb(2), one Pb(3), and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Pb(1), one Pb(4), and one P(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Pb(5) and one P(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one Pb(3) and one C(7) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one C(7) and one H(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Pb(4), one Pb(5), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Pb(3), one Pb(5), and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Pb(1), one Pb(2), and one P(2) atom. In the ninth O site, O(9) is bonded in a water-like geometry to one C(14) and one H(18) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one C(14) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one Pb(4), one Pb(5), and one P(3) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Pb(1), one Pb(3), and one P(3) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one Pb(2), one Pb(3), and one P(3) atom. In the fourteenth O site, O(14) is bonded in a single-bond geometry to one Pb(4) and one C(21) atom. In the fifteenth O site, O(15) is bonded in a single-bond geometry to one Pb(3) and one C(21) atom. In the sixteenth O site, O(16) is bonded in a distorted bent 150 degrees geometry to one Pb(2) and one P(4) atom. In the seventeenth O site, O(17) is bonded in a distorted single-bond geometry to one Pb(5) and one P(4) atom. In the eighteenth O site, O(18) is bonded in a distorted single-bond geometry to one Pb(3), one Pb(4), and one P(4) atom. In the nineteenth O site, O(19) is bonded in a distorted single-bond geometry to one Pb(2), one Pb(5), and one C(28) atom. In the twentieth O site, O(20) is bonded in a distorted single-bond geometry to one Pb(1) and one C(28) atom. Linkers: 2 [O]C(=O)c1ccc(P([O])([O])=O)cc1 ,2 [O]P([O])(=O)c1ccc(C(=O)O)cc1. Metal clusters: 5 [Pb]. The MOF has largest included sphere 1.76 A, density 3.46 g/cm3, surface area 1782.38 m2/g, accessible volume 0.05 cm3/g