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In the title compound, [Pb(2)(C(9)H(4)O(6))(2)(C(19)H(12)N(4))(2)], the Pb(II) atom is five-coordinated by two N atoms from a chelating 2-phenyl-1H-1,3,7,8-tetra-aza-cyclo-penta-[l]phenanthrene (L) ligand and three O atoms from two Hbtc ligands (H(3)btc is benzene-1,3,5-tricarb-oxy-lic acid), resulting in a distorted PbN(2)O(3) coordination. Two Pb(II) atoms are bridged by the Hbtc ligands, forming a discrete centrosymmetric dinuclear complex. Inter-molecular N-H⋯O and O-H⋯O hydrogen bonds and π-π inter-actions between the pyridine and imidazole rings, and between the pyridyl rings of the L ligands [centroid-centroid distances = 3.600 (6) and 3.732 (6) Å] lead to a three-dimensional supra-molecular structure.

acta crystallographica. section e

Bis(μ-5-carboxybenzene-1,3-dicarboxylato)-κ3O1,O1′:O3;κ3O3:O1,O1′-bis[(2-phenyl-1,3,7,8-tetraazacyclopenta[l]phenanthrene-κ2N7,N8)lead(II)]