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Syntheses and Characterization of a New One-Dimensional Polymer Containing (μ-Thiocyanate)(bpy)Lead(II) Molecule and New Mixed-Anion Lead (II) Complexes: Crystal Structures of [Pb(bpy)(SCN)2] n (byp = 2,2′-Bipyridine) and [Pb(phen)2(NO3)0.7(ClO4)0.3](ClO4) (phen = 1,10-Phenanthroline)

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Complexes [Pb(bpy)(SCN)2] n (bpy = 2,2′-bipyridine), [Pb (phen)2(NO3)0.7(ClO4)0.3](ClO4), Pb(phen)2(SCN)-(NO3), and Pb(phen)2(SCN)(ClO4) (phen = 1,10-phenanthroline)], have been synthesized using a direct reaction between Pb(NO3)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(NO3)0.7(ClO4)0.3](ClO4) 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′-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, N4S4, environment and the arrangement of the 2,2′-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 π-π 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(NO3)(ClO4) from water led to the isolation of [Pb(phen)2(NO3)0.7(ClO4)0.3](ClO4). The single crystal X-ray study shows the complex to be monomeric. The Pb atom lies in an unsymmetrical six-coordinate, N4O2, 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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Document Type: Research Article

Publication date: June 15, 2003

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