Bis(μ-5-carb-oxy-benzene-1,3-dicarboxyl-ato)-κO,O:O;κO:O,O-bis-[(2-phenyl-1,3,7,8-tetra-aza-cyclo-penta-[l]phenanthrene-κN,N)lead(II)].

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)†à ] lead to a three-dimensional supra-molecular structure.