| Abstract: | Both bis- and tetrakis-substituted 2,2′-bipyridine complexes of lead(II), Pb(bpy)2](PF6)2 and Pb(bpy)4](PF6)2 · bpy, respectively, have been characterized by X-ray crystallography as hexafluorophosphate salts when three equivalents of bipyridine is combined with Pb(NO3)2 in aqueous solution prior to metathesis. The tetrakis-substituted product, Pb(bpy)4](PF6)2 · bpy, shows an unusual combination of intramolecular and intermolecular π-stacking of two of the bipyridine ligands throughout the crystal. Incomplete metathesis also produces a catenated, mixed-anion complex, Pb(bpy)2(µ-NO3)](PF6), where the nitrate bridges lead(II) metal centers to form a 1-D coordination polymer. If metathesis is carried out using perchlorate, a known Pb(bpy)2](ClO4)2 analog is produced along with bpyH](ClO4), which has not been previously characterized by X-ray crystallography. |
