Rigid biimidazole ancillary ligands as an avenue to bright deep blue cationic iridium(III) complexes

Adam Francis Henwood, Sloane Evariste, Alexandra Martha Zoya Slawin, Eli Zysman-Colman

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)
2 Downloads (Pure)

Abstract

Herein we report the synthesis and optoelectronic characterisation of three deep blue-emitting cationic iridium complexes, of the form [Ir(dFppy)2(N^N)]PF6, bearing biimidazole-type N^N ancillary ligands (dFppyH = 2-(2,4-difluorophenyl)pyridine). Complex 1 contains the parent biimidazole, biim, while 2 contains a dimethylated analog, dMebiim, and 3 contains an ortho-xylyl-tethered biimidzole, o-xylbiim. We explore a strategy of tethering the biimidazole in order to rigidify the complex and increase the photoluminescent quantum yield, culminating in deep blue (λmax: 457 nm in MeOH at 298 K) ligand-centered emission with a very high photoluminescent quantum yield of 68% and microsecond emission lifetime. Density functional theory calculations elucidate the origin of such disparate excited state kinetics across this series, especially in light of virtually identical optoelectronic properties observed for these compounds.

Original languageEnglish
Pages (from-to)165-182
Number of pages18
JournalFaraday Discussions
Volume174
Early online date12 Jun 2014
DOIs
Publication statusPublished - 1 Dec 2014

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