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 (bpy=2,2′-bipyridine) and [Pb(phen)2(NO3)0.7(ClO4)0.3](ClO4) (phen=1,10-phenanthroline)

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 pi-pi 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.