A Photophysical and Electrochemical Investigation on a Phenylacetylene Macrocycle Containing Two 2,2′-Bipyridine Units, Its Protonated Forms, and RuII and OsII Complexes
作者:Margherita Venturi、Filippo Marchioni、Vincenzo Balzani、Dorina M. Opris、Oliver Henze、A. Dieter Schlüter
DOI:10.1002/ejoc.200300384
日期:2003.11
[Ru(bpy)2(3)]2+, [Ru(bpy)3]2+, and [Os(bpy)3]2+. In the dinuclear complexes the two metal centres and the two 2,2′-bipyridine units of macrocycle 1 behave independently, as shown by the reversible bielectronic processes observed on oxidation and reduction. Both 1 and its dinuclear complexes contain reactive substituents and can therefore be used as starting components for the construction of photo- and
苯乙炔大环 1 在其形状持久结构的相反位置结合了两个 2,2'-联吡啶 (bpy) 螯合单元,在紫外光谱区(λmax = 305 nm,ϵmax = 118000 M−)显示出强烈的吸收带1cm−1) 和二氯甲烷溶液中非常强的荧光带(λmax = 381 nm,τ = 0.8 ns,Φ = 0.9)。用三氟甲磺酸滴定后,两个 bpy 单元独立质子化,形成 [1.2H]2+ 物种,该物种显示新的吸收带,λmax = 355 nm (ϵmax = 42000 M−1cm−1) 和弱荧光 ( λmax = 520 纳米)。双核 [(bpy)2Ru(1)Ru(bpy)2]4+ 和 [(bpy)2Os(1)Os(bpy)2]4+ 配合物不显示任何以配体为中心的发射,并表现出吸收和发射带在可见光区[(bpy)2Ru(1)Ru(bpy)2]4+,吸收:λmax = 453 nm,ϵmax = 19000