PbC20H10Br4(N2O3)2 crystallizes in the monoclinic C2/c space group. Pb(1) is bonded in a 8-coordinate geometry to two equivalent N(1), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Pb(1)-N(1) bond lengths are 2.77 Å. Both Pb(1)-O(1) bond lengths are 2.77 Å. Both Pb(1)-O(2) bond lengths are 2.59 Å. Both Pb(1)-O(3) bond lengths are 2.83 Å. There are ten 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 1.52 Å. The C(1)-O(1) bond length is 1.27 Å. The C(1)-O(2) bond length is 1.26 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(4) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-C(4) bond length is 1.40 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one Br(1) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-Br(1) bond length is 1.90 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(2), one C(3), and one Br(2) atom. The C(4)-Br(2) bond length is 1.89 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(6), one N(1), and one H(2) atom. The C(5)-C(6) bond length is 1.40 Å. The C(5)-N(1) bond length is 1.34 Å. The C(5)-H(2) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(5) and one H(3) atom. The C(6)-H(3) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(8) and one H(4) atom. The C(7)-C(8) bond length is 1.40 Å. The C(7)-H(4) bond length is 1.09 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(10), one C(7), and one C(9) atom. The C(8)-C(10) bond length is 1.49 Å. The C(8)-C(9) bond length is 1.40 Å. In the ninth C site, C(9) is bonded in a distorted trigonal planar geometry to one C(8), one N(1), and one H(5) atom. The C(9)-N(1) bond length is 1.34 Å. The C(9)-H(5) bond length is 1.09 Å. In the tenth C site, C(10) is bonded in a distorted trigonal planar geometry to one C(8), one N(2), and one O(3) atom. The C(10)-N(2) bond length is 1.36 Å. The C(10)-O(3) bond length is 1.25 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a bent 120 degrees geometry to one Pb(1), one C(5), and one C(9) atom. In the second N site, N(2) is bonded in a distorted bent 120 degrees geometry to one C(10) and one H(1) atom. The N(2)-H(1) bond length is 1.04 Å. There are five inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one N(2) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(5) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(6) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(7) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(9) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Pb(1) and one C(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Pb(1) and one C(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to one Pb(1) and one C(10) atom. There are two inequivalent Br sites. In the first Br site, Br(2) is bonded in a single-bond geometry to one C(4) atom. In the second Br site, Br(1) is bonded in a single-bond geometry to one C(3) atom. Linkers: 2 O=C(NNC(=O)c1cccnc1)c1cccnc1 ,4 O=C(NNC(=O)c1cccnc1)c1c[c]cnc1 ,2 [O]C(=O)c1c(Br)c(Br)c(C([O])=O)c(Br)c1Br. Metal clusters: 2 [O].[O].[O][C]=O.[O][C]=O.[Pb]. RCSR code: sql. The MOF has largest included sphere 1.83 A, density 2.72 g/cm3, surface area 2599.35 m2/g, accessible volume 0.06 cm3/g