Preparation and Photophysical Properties of Mixed-Ligand Cyclometallated Complexes of Ir(III) with a Dendritic Bipyridine Ligand
作者:M. V. Kulikova、N. McClenaghan、K. P. Balashev
DOI:10.1007/s11176-005-0295-x
日期:2005.5
Complexes [Ir(C^N)2(G1-bpy)]PF6, where C^N is a cyclometallating ligand derived from 2-(2′-thienyl)pyridine and 2-phenylpyridine, and G1-bpy is a dendritic bipyridine ligand of the first generation, 4,4′-bis[3″,5″-bis(benzyloxy)phenylethyl]-2,2′-bipyridine, were prepared and characterized by 1H NMR, electronic absorption, and emission spectroscopy. The polyether dendritic substituents exert a “ soft” effect on the spectral and luminescence properties of the complexes, manifested as slight destabilization of the electronically excited charge-transfer state involving the bipyridine ligand, as compared to the model complexes [Ir(C^N)2(bpy)]PF6.
配合物 [Ir(C^N)2(G1-bpy)]PF6,其中 C^N 是由 2-(2′-噻吩基)吡啶和 2-苯基吡啶衍生的环金属配体,而 G1-bpy 是第一代树枝状双吡啶配体、制备了 4,4′-双[3″,5″-双(苄氧基)苯基乙基]-2,2′-联吡啶,并通过 1H NMR、电子吸收和发射光谱对其进行了表征。与模型配合物 [Ir(C^N)2(bpy)]PF6 相比,聚醚树枝状取代基对配合物的光谱和发光特性产生了 "软 "影响,表现为涉及联吡啶配体的电子激发电荷转移态的轻微不稳定。