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Source of materialAmixture of Pb(NO 3 ) 2 (0.5 mmol), naphthalene-1,4-dicarboxylic acid (1,4-H 2 ndc, 0.5 mmol) and bis(2-(2-chloro-6-fluorophenyl)-1H-imidazo[4,5-f][1,10]phenanthroline (L, 0.5 mmol) in 12 .mL distilled water was heated at 455 Ki naT eflon-lined stainless steel autoclave for seven days. The reaction system was then slowly cooled to room temperature. Pale yellow crystals of the title compound suitable for single crystal X-ray diffraction analysis were collected by filtration, washed several times with distilled water and dried in air at ambient temperature (yield 62 % based on Pb(II)). Experimental detailsAll Hatoms were positioned geometrically (d(C-H) =0.93 Å) and refined as riding, with U iso (H) =1.2 U eq (carrier). The Hatoms of the water molecules were not located. The disordered carboxylate Oatoms (O2 and O2') were refined using Oatoms split over two sites, with atotal occupancy of 1. DiscussionLead(II), as aheavy toxic metal, is commonly found in critical life cycles due to its widespread use in numerous industrial applications [1]. The possible molecular mechanisms of lead(II) toxicity may be involved in several different types of proteins. Therefore, ag ood knowledge of the lead(II) coordination properties, including aspects such as the lone pair of electrons, coordination number, and coordination geometry, is crucial for understanding of the toxicological properties of lead(II) [2]. Each Pb(II) atom is seven-coordinated by four nitrogen atoms from two different Lligands, and three carboxylate oxygen atoms from two different 1,4-ndc ligands. The 1,4-ndc dianions link neighboring Pb(II) atoms to an one-dimensional chain structure. The Lligands are attached on both sides of the chains. Further, the aromatic p-p stacking interactions between Lligands of neighbouring chains extended the adjacent chains into an interesting two-dimensional supramolecular architecture.

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