Preparation and Photophysical Properties of Mixed-Ligand Cyclometallated Complexes of Ir(III) with a Dendritic Bipyridine Ligand

Authors: Kulikova, M.¹; McClenaghan, N.²; Balashev, K.¹

Source: Russian Journal of General Chemistry, Volume 75, Number 5, May 2005 , pp. 665-671(7)

Publisher: MAIK Nauka/Interperiodica

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Abstract:

Complexes [Ir(CˆN)₂(G1-bpy)]PF₆, where CˆN is a cyclometallating ligand derived from 2-(2 prime

-thienyl)pyridine and 2-phenylpyridine, and G1-bpy is a dendritic bipyridine ligand of the first generation, 4,4 prime

-bis[3

-bis(benzyloxy)phenylethyl]-2,2 prime

-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(CˆN)₂(bpy)]PF₆.

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s11176-005-0295-x

Affiliations: 1: Herzen Russian State Pedagogical University, St. Petersburg, Russia, 2: University of Messina, Messina, Italy,

Publication date: 2005-05-01