Journal
DALTON TRANSACTIONS
Volume 43, Issue 2, Pages 784-789Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3dt52077c
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Funding
- European Community's Seventh Framework Program through MATERIA project [PONa3_00370]
- European Union
- Regione Calabria (Fondo Sociale Europeo, POR Calabria FSE)
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Two anionic iridium complexes [(R-ppy)(2)Ir(O<^>N)]TBA with R-ppy = 2-phenylpyridine or 4,5'-dimethyl-2-phenylpyridine, O<^>N = dianionic form of orotic acid and TBA = tetrabutylammonium have been synthesised and fully characterised by UV-Vis, emission, IR, NMR and cyclic voltammetric studies. These cyclo-metallated luminescent complexes containing a dianionic bidentate ancillary ligand show bright emission (60-70% PLQY) with maxima in the green region of the visible spectrum. Coupled with the ionic iridium complexes [(ppy)(2)Ir(N<^>N)]X, where N<^>N = 2-picolylamine or 2,2'-bipyridyl, and X = Cl- or CH3CO2-, a series of new soft salts of general formula [(ppy)(2)Ir(N<^>N)][(R-ppy)(2)Ir (O<^>N)] have been obtained and fully characterized, with enhanced luminescent properties up to ca. 80% of phosphorescence quantum yields.
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