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The flexible ditopic ligand 3,3′-bipyridine (3,3′-bpy) has been reacted with a series of transition metal species (Ag + , Hg 2+ , cis-a 2 M 2+  (a = NH 3  or a 2  = en; M = Pt, Pd), trans-a 2 Pt 2+  (a = NH 3 )) in an attempt to produce discrete cyclic constructs. While Ag +  gave a polymeric structure {[Ag(3,3′-bpy)](ClO 4 ) · H 2 O}  n   ( 1 ), with all other metal entities cyclic structures were formed. Interestingly, Hg(CH 3 COO) 2  produced a dinuclear complex [Hg(3,3′-bpy)(CH 3 COO) 2 ] 2  · 3H 2 O ( 2 ), in which the two 3,3′-bpy ligands adopt a cis-orientation of the coordinating pyridyl entities. With cis-(NH 3 ) 2 Pt 2+ , a cyclic complex  4  was isolated in crystalline form which, according to HRMS, is a trimer. With trans-(NH 3 ) 2 Pt 2+ , different species are formed according to  1 H NMR spectroscopy, the nature of which was not established.

Molecular Architectures Derived from Metal Ions and the Flexible 3,3′-Bipyridine Ligand: Unexpected Dimer with Hg(II)

Molecular Architectures Derived from Metal Ions and the Flexible 3,3^′-Bipyridine Ligand: Unexpected Dimer with Hg(II)