Charged Bis-Cyclometalated Iridium(III) Complexes with Carbene-Based Ancillary Ligands (Articolo in rivista)

Type
Label
  • Charged Bis-Cyclometalated Iridium(III) Complexes with Carbene-Based Ancillary Ligands (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/ic400600d (literal)
Alternative label
  • Monti, Filippo and Kessler, Florian and Delgado, Manuel and Frey, Julien and Bazzanini, Federico and Accorsi, Gianluca and Armaroli, Nicola and Bolink, Henk J. and Ortí, Enrique and Scopelliti, Rosario and Nazeeruddin, Md. Khaja and Baranoff, Etienne (2013)
    Charged Bis-Cyclometalated Iridium(III) Complexes with Carbene-Based Ancillary Ligands
    in Inorganic chemistry (Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Monti, Filippo and Kessler, Florian and Delgado, Manuel and Frey, Julien and Bazzanini, Federico and Accorsi, Gianluca and Armaroli, Nicola and Bolink, Henk J. and Ortí, Enrique and Scopelliti, Rosario and Nazeeruddin, Md. Khaja and Baranoff, Etienne (literal)
Pagina inizio
  • 10292 (literal)
Pagina fine
  • 10305 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://dx.doi.org/10.1021/ic400600d (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 52 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 18 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Monti, Filippo; Accorsi, Gianluca, Armaroli, Nicola Istituto per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerche, Via P. Gobetti 101, 40129 Bologna, Italy Delgado, Manuel; Bolink, Henk.; Ortí, Enrique, Instituto de Ciencia Molecular, Universidad de Valencia, 46980 Paterna, Spain Kessler, Florian; Frey, Julien; Scopelliti, Rosario; Nazeeruddin, Md. Khaja, Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland Baranoff, Etienne, School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K. (literal)
Titolo
  • Charged Bis-Cyclometalated Iridium(III) Complexes with Carbene-Based Ancillary Ligands (literal)
Abstract
  • Charged cyclometalated (C?N) iridium(III) complexes with carbene-based ancillary ligands are a promising family of deep-blue phosphorescent compounds. Their emission properties are controlled primarily by the main C?N ligands, in contrast to the classical design of charged complexes where N?N ancillary ligands with low-energy ?* orbitals, such as 2,2'-bipyridine, are generally used for this purpose. Herein we report two series of charged iridium complexes with various carbene-based ancillary ligands. In the first series the C?N ligand is 2-phenylpyridine, whereas in the second one it is 2-(2,4-difluorophenyl)-pyridine. One bis-carbene (:C?C:) and four different pyridine-carbene (N?C:) chelators are used as bidentate ancillary ligands in each series. Synthesis, X-ray crystal structures, and photophysical and electrochemical properties of the two series of complexes are described. At room temperature, the :C?C: complexes show much larger photoluminescence quantum yields (?PL) of ca. 30%, compared to the N?C: analogues (around 1%). On the contrary, all of the investigated complexes are bright emitters in the solid state both at room temperature (1% poly(methyl methacrylate) matrix, ?PL 30-60%) and at 77 K. Density functional theory calculations are used to rationalize the differences in the photophysical behavior observed upon change of the ancillary ligands. The N?C:-type complexes possess a low-lying triplet metal-centered (3MC) state mainly deactivating the excited state through nonradiative processes; in contrast, no such state is present for the :C?C: analogues. This finding is supported by temperature-dependent excited-state lifetime measurements made on representative N?C: and :C?C: complexes. (literal)
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