Click-Derived Triazolylidenes as Chelating Ligands: Achievement of a Neutral and Luminescent Iridium(III)-Triazolide Complex

Inorganic Chemistry
Elia MatteucciLetizia Sambri

Abstract

Versatility in the synthesis of triazole derivatives was exploited to obtain convenient mesoionic carbenes working as chelating or cyclometalating ligands for the preparation of cationic or neutral iridium(III) complexes. We present the synthesis and characterization of three new cationic cyclometalating iridium(III) complexes (1-3-BF4) and a neutral one (4), equipped with functionalized triazolylidene ligands. All the complexes are obtained in good yields, present irreversible or quasi-reversible oxidation and reduction processes, and display good photophysical stability. The complexes emit from 3MLCT or 3LC states, depending on the nature of the ancillary ligand. Compounds 1-3-BF4 display very low photoluminescence quantum yields (PLQY ≈ 1% in acetonitrile solution). Density functional theory calculations show that the luminescence of these three complexes is quenched by the presence of low-lying 3MC states, leading to a reversible detachment of the neutral ancillary ligands from the metal coordination sphere. On the contrary, this nonradiative deactivation pathway is not present in the case of the neutral complex 4, which in fact shows PLQYs above 10% and is the best emitter of the series. Moreover, complex 4 represents the ...Continue Reading

References

Aug 12, 2005·Chemical Reviews·Jacopo TomasiRoberto Cammi
Feb 16, 2007·Angewandte Chemie·Christoph NolteBernd F Straub
Jan 12, 2008·Accounts of Chemical Research·Yan Zhao, Donald G Truhlar
May 16, 2008·Angewandte Chemie·Elaine M SchusterMark Gandelman
May 2, 2009·The Journal of Chemical Physics·Detlev FiggenHermann Stoll
Jun 23, 2009·Journal of the American Chemical Society·Tissa SajotoMark E Thompson
Nov 11, 2010·Angewandte Chemie·Ralte LalrempuiaMartin Albrecht
Oct 4, 2011·Inorganic Chemistry·Sébastien LadouceurEli Zysman-Colman
Oct 25, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Florian KesslerEtienne Baranoff
Aug 14, 2012·Angewandte Chemie·Rubén D CostaNicola Armaroli
Apr 26, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Loïc DonatoEli Zysman-Colman
Aug 27, 2013·Journal of the American Chemical Society·Joby WinnStephen M Goldup
Sep 6, 2013·Inorganic Chemistry·Filippo MontiEtienne Baranoff
Jun 27, 2014·Nature·Matthew N HopkinsonFrank Glorius
Jul 9, 2014·Inorganic Chemistry·Filippo MontiNicola Armaroli
Jul 22, 2014·Chemistry : a European Journal·Ramananda MaityBiprajit Sarkar
Aug 12, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Andrea BaschieriLetizia Sambri
Feb 28, 2017·Chemical Communications : Chem Comm·Jaroslaw G OsiakHans-Hermann Johannes
Nov 8, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Paul A Scattergood, Paul I P Elliott

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