Preparation and Photophysical Properties of Mixed-Ligand Cyclometallated Complexes of Ir(III) with a Dendritic Bipyridine Ligand
Source: Russian Journal of General Chemistry, Volume 75, Number 5, May 2005 , pp. 665-671(7)
Publisher: MAIK Nauka/Interperiodica
Abstract:Complexes [Ir(CN)2(G1-bpy)]PF6, where CN 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(CN)2(bpy)]PF6.
Document Type: Research article
Publication date: 2005-05-01