557793-46-1Relevant articles and documents
The synthesis and properties of solution processable red-emitting phosphorescent dendrimers
Frampton, Michael J.,Namdas, Ebinazar B.,Lo, Shih-Chun,Burn, Paul L.,Samuel, Ifor D. W.
, p. 2881 - 2888 (2004)
We report methodology for the preparation of symmetric and asymmetric solution processable phosphorescent dendrimers that are comprised of 2-ethylhexyloxy surface groups, biphenyl based dendrons, and iridium(III) complex cores. The symmetric dendrimer has three dendritic 2-benzo[b]thiophene- 2′-ylpyridyl (BTP) ligands with the dendritic ligands responsible for red emission. The asymmetric dendrimer has two dendritic 2-phenylpyridyl ligands and one unsubstituted BTP ligand. Iridium(III) complexes comprised of 2-phenylpyridyl ligands are normally associated with green emission whereas those containing BTP ligands emit red light. Red emission is observed from the asymmetric dendrimer demonstrating that emission occurs primarily from the metal-to-ligand charge transfer state associated with the ligand with the lowest HOMO-LUMO energy gap. The photoluminescence quantum yields (PLQYs) of the symmetric and asymmetric dendrimers were strongly dependent on the dendrimer structure. In solution the PLQYs of the asymmetric and symmetric dendrimers were 47 ± 5% and 29 ± 3% respectively. The photoluminescence lifetime of the emissive state of both dendrimers in solution was 7.3 ± 0.1 μs. In the solid state the comparative PLQYs were reversed with the symmetric dendrimer having a PLQY of 10 ± 1% and the asymmetric dendrimer a PLQY of 7 ± 1%. The comparatively larger decrease in PLQY for the asymmetric dendrimer in the solid state is attributed to increased core-core interactions. The intermolecular interactions are greater in the asymmetric dendrimer because there is no dendron on the BTP ligand. Electrochemical analysis shows that charge is injected directly into the cores of the dendrimers.
Regioselective ruthenium-catalyzed carbonylative direct arylation of five-membered and condensed heterocycles
Pospech, Jola,Tlili, Anis,Spannenberg, Anke,Neumann, Helfried,Beller, Matthias
supporting information, p. 3135 - 3141 (2014/03/21)
A ruthenium-catalyzed carbonylative Ci￡H bond arylation process for the three-component synthesis of complex aryl-(hetero)aryl ketones in an aqueous solution has been developed. By exploiting the ortho-activating effect of nitrogen-containing directing groups, a regioselective, successive twofold C(sp2)i￡C(sp2) bond formation has been achieved. This straightforward catalytic process provides access to versatile products prevalent in multiple bioactive compounds and supplies a valuable functional group for subsequent transformations. Ci￡ H bond functionalization: A ruthenium-catalyzed carbonylative Ci￡H bond arylation process for the three-component synthesis of complex aryl-(hetero)aryl ketones in an aqueous solution has been developed (see scheme). By exploiting the ortho-activating effect of nitrogen-containing directing groups, a regioselective, successive twofold C(sp2) i￡C(sp2) bond formation has been achieved.
Enhancing phosphorescence and electrophosphorescence efficiency of cyclometalated Pt(II) compounds with triarylboron
Hudson, Zachary M.,Sun, Christina,Helander, Michael G.,Amarne, Hazem,Lu, Zheng-Hong,Wang, Suning
experimental part, p. 3426 - 3439 (2012/01/13)
A synthetic strategy for the preparation of cyclometalated platinum(II) acetylacetonate (acac) complexes functionalized with triarylboron is achieved. This method is used to synthesize a series of triarylboron-functionalized phosphorescent Pt(acac) compou
A deep red phosphorescent Ir(III) complex for use in polymer light-emitting diodes: Role of the arylsilyl substituents
You, Ngmin,An, Cheng-Guo,Kim, Jang-Joo,Soo, Young Park
, p. 6241 - 6246 (2008/02/09)
(Figure Presented) Here we report the synthesis and electrophosphorescence of a new deep-red phosphorescent Ir(III) complex with spatially embracing and thus solubilizing arylsilyl-substituted ligands, Ir(III) tris(2-(2′- benzo[b]thienyl)-5-(4′-triphenylsilylphenyl)pyridinato-N,C 3′). A poly(N-vinylcarbazole) (PVK) film doped with this Ir(III) complex exhibited excellent phase homogeneity and showed saturated red electrophosphorescence of 2.7% maximum external quantum efficiency, whose Commission Internationale de L'Eclairage coordinates were (0.69, 0.30).
Solution-processible conjugated electrophosphorescent polymers
Sandee, Albertus J.,Williams, Charlotte K.,Evans, Nicholas R.,Davies, John E.,Boothby, Clare E.,Koehler, Anna,Friend, Richard H.,Holmes, Andrew B.
, p. 7041 - 7048 (2007/10/03)
We report the synthesis and photophysical study of a series of solution-processible phosphorescent iridium complexes. These comprise bis-cyclometalated iridium units [Ir(ppy)2(acac)] or [Ir(btp) 2-(acac)] where ppy is 2-phenylpyridin
