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Three new lead(II) complexes containing the 1,10-phenanthroline ligand, [Pb(phen) 2 (3,5-DNB) 2 ] ( 1 ), [Pb(phen) 2 (3,5-DNB)(NO 3 )] 2 ·H 2 O ( 2 ), and [Pb(phen)(HCOO)(NO 3 )(H 2 O)]   n    ( 3 ) (phen = 1,10-phenanthroline, 3,5-DNB = 3,5-dinitrobenzoate anion) have been synthesized and characterized by elemental analyses, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analyses (TGA), and single-crystal X-ray diffraction. The complexes  1  and  2  are monomeric species, whereas complex  3  is a one-dimensional polymer. In the three complexes, the ligand phen creates a number of π···π stacking interactions and hydrogen bonds, which play an important role in extending complexes  1 – 3  to supramolecular architectures. The Pb(II) ion of complexes  1  and  2  shows hemidirected geometry with noncovalent Pb···O/C tetrel bonds formed which further stabilize the supramolecular structures.

Synthesis, crystal structure, and properties of three lead(II) complexes based on the 1,10-phenanthroline ligand