A new nanostructured coordination polymer of divalent lead with the ligand 2,9-dimethyl-1,10-phenanthroline (dmp), [Pb(dmp)(μ-N₃)(μ-NO₃)]_n (1), was synthesized by sonochemical methods. The polymer was characterized by scanning electron microscopy, X-ray powder diffraction, IR, ¹H NMR, and ¹³C NMR spectroscopy, and elemental analyses. Compound 1 was structurally characterized by single-crystal X-ray diffraction. The single-crystal analysis shows that the coordination number of Pb^II ions is seven, (PbN₄O₃) has a “stereo-chemically active” electron lone pair, and the coordination sphere is hemidirected. The chains interact with each other through π–π stacking interactions to create a 3D framework. The structure of the title complex was optimized by density functional calculations. The calculated structural parameters and the IR spectrum of the title complex are in agreement with the crystal structure.

The title compound, [Cd₂Cl₄(C₁₈H₁₄N₄O)₂], was obtained from the reaction of Cd(NO₃)₂·4H₂O with 2-phenylpyridineketon picolinoyl hydrazone and sodium chloride. Each Cd²⁺cation is coordinated by two N atoms and one O atom of the tridentate ligand and three chloride anions, forming a distorted CdNOCl₃octahedron. Each pair of adjacent metal cations is linked by two bridging chloride ligands, resulting in a dinuclear complex unit. The molecular conformation is stabilized by intramolecular N—H...N and C—H...O hydrogen bonds. In the crystal, molecules are linked by nonclassical C—H...O and C—H...Cl hydrogen bonds into a three-dimensional network. In addition, π–π stacking interactions [centroid–centroid distances = 3.777 (2) and 3.631 (2) Å] contribute to the stabilization of the crystal packing.