Biblio. IMN

Référence en vue solo

Martìnez-Vollbert, E., Ciambrone, C., Lafargue-Dit-Hauret, W., Latouche, C., Loiseau, F. & Lanoe, P.-H. (2022) Bis-Heteroleptic Cationic Iridium(III) Complexes Featuring Cyclometalating 2-Phenylbenzimidazole Ligands: A Combined Experimental and Theoretical Study. Inorg. Chem. 61 3033–3049. 
Added by: Richard Baschera (2022-03-25 10:56:30)   Last edited by: Richard Baschera (2022-03-25 10:57:24)
Type de référence: Article
DOI: 10.1021/acs.inorgchem.1c02968
Numéro d'identification (ISBN etc.): 0020-1669
Clé BibTeX: MartnezVollbert2022
Voir tous les détails bibliographiques
Catégories: MIOPS
Créateurs: Ciambrone, Lafargue-Dit-Hauret, Lanoe, Latouche, Loiseau, Martìnez-Vollbert
Collection: Inorg. Chem.
Consultations : 18/162
Indice de consultation : 20%
Indice de popularité : 5%
Liens URLs ... .inorgchem.1c02968
In this report, we investigate a new family of cationic iridium(III) complexes featuring the cyclometalating ligand 2-phenylbenzimidazole and ancillary ligand 4,4′-dimethyl-2,2′-bipyridine. Our benchmark complex IrL12 (L1 = 2-phenylbenzimidazole) displays emission properties similar to those of the archetypical complex 2,2′-dipyridylbis(2′,4′-phenylpyridine)iridium(III) in deaerated CH3CN (Φ = 0.20, λem = 584 nm and Φ = 0.14, λem = 585 nm, respectively) but exhibits a higher photoluminescence quantum yield in deaerated CH2Cl2 (Φ = 0.32, λem = 566 nm and Φ = 0.20, λem = 595 nm, respectively) and especially a lower nonradiative constant (knr = 6.6 × 105 s–1 vs knr = 1.4 × 106 s–1, respectively). As a primary investigation, we explored the influence of the introduction of electron-donating and electron-withdrawing groups on the benzimidazole moiety and the synergetic effect of the substitution of the cyclometalating phenyl moiety at the para position with the same substituents. The emission energy displays very good correlation with the Hammett constants of the introduced substituents as well as with ΔEredox values, which allow us to ascribe the phosphorescence of these series to emanate mainly from a mixed metal/ligand to ligand charge transfer triplet excited state (3M/LLCT*). Two complexes (IrL52 and IrL82) display a switch of the lowest triplet excited state from 3M/LLCT* to ligand centered (3LC*), from the less polar CH2Cl2 to the more polar CH3CN. The observed results are supported by (TD)-DFT computations considering the vibrational contributions to the electronic transitions. Chromaticity diagrams based on the maximum emission wavelength of the recorded and simulated phosphorescence spectra demonstrate the strong promise of our complexes as emitting materials, together with the very good agreement between experimental and theoretical results.
Publisher: American Chemical Society
wikindx 4.2.2 ©2014 | Références totales : 2608 | Requêtes métadonnées : 52 | Exécution de script : 0.11362 secs | Style : Harvard | Bibliographie : Bibliographie WIKINDX globale