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

[摘要] The flexible ditopic ligand 3,3′-bipyridine (3,3′-bpy) has been reacted with a series of transition metal species (Ag+, Hg2+, cis-a2M2+(a=NH3ora2=en;M=Pt,Pd), trans-a2Pt2+(a=NH3)) in an attempt to produce discrete cyclic constructs. While Ag+gave a polymeric structure{[Ag(3,3′-bpy)](ClO4) · H2O}n(1), with all other metal entities cyclic structures were formed. Interestingly, Hg(CH3COO)2produced a dinuclear complex [Hg(3,3′-bpy)(CH3COO)2]2 · 3H2O (2), in which the two 3,3′-bpy ligands adopt a cis-orientation of the coordinating pyridyl entities. With cis-(NH3)2Pt2+, a cyclic complex4was isolated in crystalline form which, according to HRMS, is a trimer. With trans-(NH3)2Pt2+, different species are formed according to1HNMR spectroscopy, the nature of which was not established.

[学科分类] 物理化学和理论化学