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Blue-green emissive cationic iridium(III) complexes using partially saturated strongly-donating guanidyl-pyridine/-pyrazine ancillary ligands.

Blue-green emissive cationic iridium(III) complexes using partially saturated strongly-donating guanidyl-pyridine/-pyrazine ancillary ligands.

Authors :
Hasan K
Pal AK
Auvray T
Zysman-Colman E
Hanan GS
Source :
Chemical communications (Cambridge, England) [Chem Commun (Camb)] 2015 Sep 25; Vol. 51 (74), pp. 14060-3.
Publication Year :
2015

Abstract

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.

Details

Language :
English
ISSN :
1364-548X
Volume :
51
Issue :
74
Database :
MEDLINE
Journal :
Chemical communications (Cambridge, England)
Publication Type :
Academic Journal
Accession number :
26247307
Full Text :
https://doi.org/10.1039/c5cc04069h