Complexes [Pb(bpy)(SCN) 2 ] n (bpy ¼ 2,2 0 -bipyridine), [Pb (phen) 2 (NO 3 ) 0.7 (ClO 4 ) 0.3 ](ClO 4 ), Pb(phen) 2 (SCN)-(NO 3 ), and Pb(phen) 2 (SCN)(ClO 4 ) (phen ¼ 1,10-phenanthroline)], have been synthesized using a direct reaction between Pb(NO 3 ) 2 and ligands. The complexes have been isolated and characterized by IR-spectra and CHN-elemental analysis. The structures of [Pb(bpy)(SCN) 2 ] n and [Pb(phen) 2 (NO 3 ) 0.7 (ClO 4 ) 0.3 ](ClO 4 ) have been confirmed by X-ray crystallography. The single crystal X-ray crystallography of a new one-dimensional complex of Pb(II) with 2,2 0 -bipyridine, [Pb(bpy)(SCN) 2 ] n , shows the complex to be polymeric as a result of thiocyanate ligand bridging. The Pb atom being in a unsymmetrical eight-coordinate, N 4 S 4 , environment and the arrangement of the 2,2 0 -bipyridine, thiocyanate anion suggest a gap in coordination geometry around the Pb(II) ion, occupied possibly by a stereoactive lone pair of electrons on lead (II) and the coordination around atoms is hemi-directed. There is a -interaction between the aromatic rings of the interchains in [Pb(bpy)(SCN) 2 ] n , this stacking causes the complex to be more stable. An attempt to isolate single crystals of Pb(phen) 2 (NO 3 )(ClO 4 ) from water led to the isolation of [Pb(phen) 2 (NO 3 ) 0.7 (ClO 4 ) 0.3 ](ClO 4 ). The single crystal X-ray study shows the complex to be monomeric. The Pb atom lies in an unsymmetrical six-coordinate, N 4 O 2 , environment and the arrangement of the 1,10-phenanthrolines, suggest a gap in coordination geometry around the Pb(II) ion, occupied possibly by a stereoactive lone pair of electrons on lead (II) and the coordination around atoms is hemi-directed.
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