Blue-green emissive cationic iridium(III) complexes using partially saturated strongly-donating guanidyl-pyridine/pyrazine ancillary ligands
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A new class of cationic iridium(III) complexes of the form [(C^N)2Ir(N^N)][PF6] is reported, where C^N = cyclometallating 2-phenylpyridinato, ppy, or 2-(2,4-difluorophenyl)-5′-methylpyridinato, dFMeppy, and N^N = guanidyl-pyridine, gpy, or pyrazine, gpz, as the ancillary ligand. A large blue-shift in the emission coupled with a 7-to-9 fold enhancement in photoluminescence quantum yield and microsecond emission lifetimes were observed for the complexes containing the partially saturated gpy ligand as compared to the benchmark complex [(ppy)2Ir(bpy)][PF6], C1, where bpy is 2,2′-bipyridine.
Hasan , K , Pal , A K , Auvray , T , Zysman-Colman , E & Hanan , G S 2015 , ' Blue-green emissive cationic iridium(III) complexes using partially saturated strongly-donating guanidyl-pyridine/pyrazine ancillary ligands ' Chemical Communications , vol In press . DOI: 10.1039/C5CC04069H
Copyright 2015 the Authors. This Open Access Article is licensed under a Creative Commons Attribution 3.0 Unported Licence (http://creativecommons.org/licenses/by/3.0/)
The authors are grateful to the Natural Sciences and Engineering Research Council (NSERC) of Canada, le Fonds québécois de la recherche sur la nature et les technologies (FRQNT), the Centre for Self Assembled Chemical Structures (CSACS), the Centre in Green Chemistry and Catalysis (CCVC), and the Université de Montréal (UdeM) for financial support. EZ-C acknowledges the University of St Andrews for financial support.