- New carboline-based donors for green exciplex-forming systems
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The carbazole of a model compound CPTBF was replaced by α- and β-carboline to give donors α-CPTBF and β-CPTBF, respectively. The introduction of carboline leads the new donors to have deeper highest occupied molecular orbital (HOMO) energy levels. Different electron acceptors were tested, among them, a new acceptor, 3,4-CN, was found to give exciplexes with efficient green emissions that are blue-shifted as compared to that of model CPTBF:3,4-CN system. The exciplex formations of α-CPTBF:3,4-CN and β-CPTBF:3,4-CN blends were verified with the significantly red-shifted emissions different from those of constituent donor and acceptor together with the delayed fluorescent observed by time-resolved PL decay experiments. The organic light-emitting diode (OLED) devices with α-CPTBF:3,4-CN and β-CPTBF:3,4-CN blends as the emitting layer showed a maximum external quantum (EQE) of 7.57 and 7.34%, respectively, which is higher as compared to that (EQE = 6.87%) of the model device employing CPTBF:3,4-CN. These results were attributed to the higher exciplex photoluminescence quantum yields due to the higher delay fluorescence components, deeper HOMO, and higher triplet energy of the carboline donors. In addition, the β-CPTBF:3,4-CN exciplex-based OLED exhibited better efficiency roll-off at higher luminesce due to more charge balance with less polaron formation, which was analyzed with time-resolved EL.
- Chen, Chia-Hsun,Cheng, Ju-Ting,Ding, Wen-Cheng,Lin, Zong-Liang,Chen, Yi-Sheng,Chiu, Tien-Lung,Lo, Yuan-Chih,Lee, Jiun-Haw,Wong, Ken-Tsung
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Read Online
- Magnesium promoted autocatalytic dehydrogenation of amine borane complexes: A reliable, non-cryogenic, scalable access to boronic acids
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Owing to the unusual reactivity of dialkylamine-borane complexes, a methodology was developed to simply access boronic acids. The intrinsic instability of magnesium aminoborohydride was tweaked into a tandem dehydrogenation borylation sequence. Proceeding via an autocatalytic cycle, amineborane dehydrogenation was induced by a variety of Grignard reagents. Overall, addition of the organomagnesium species onto specially designed dialkylamine-borane complexes led to a variety of boronic acids in high yields. In addition, the reaction can be performed under Barbier conditions, on a large scale.
- Marciasini, Ludovic D.,Richard, Jimmy,Cacciuttolo, Bastien,Sartori, Guillaume,Birepinte, Melodie,Chabaud, Laurent,Pinet, Sandra,Pucheault, Mathieu
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p. 164 - 171
(2018/12/05)
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- Asymmetrie synthesis of 1,1-diarylalkyl units by a copper hydride catalyzed reduction: Differentiation between two Similar aryl substituents
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An efficient method for the preparation of enantiomerically enriched 1,1-diarylalkyl units has been developed. The use of copper hydride complexed by the (R)-1-[(5)-2-diphenylphosphino)ferrocenyl]ethyldicyclohexylphosphine (Josiphos) ligand effects a highly enantioselective conju-gate reduction of β,β-diaryl-substituted α,β-unsaturated nitriles with aryl groups of similar steric demand and no secondary coordination site. A range of substrates with meta and para substituents on the aryl group were reduced with good to excellent enantioselectivities (up to 97% enantiomeric excess (ee)) and this methodology was applied to the formal synthesis of indatraline.
- Yoo, Kihyun,Kim, Hyohyun,Yun, Jaesook
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scheme or table
p. 11134 - 11138
(2010/04/25)
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- Process for preparing substituted biphenylanilides
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The present invention relates to a process for preparing substituted biphenylanilides of the formula I wherein R1 is a protected amino group which comprises reacting a compound of formula II in the presence of a base and of a palladium catalyst in a solvent, with an organoboron compound of formula (III)
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Page/Page column 12
(2009/12/05)
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- Propanoic acid derivatives
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Propanoic acid derivatives of formula (1) are described: Ar—X1—Ar1—Z—R??(1) in which Ar is a nitrogen base containing group; X1is linker atom or group; Ar1is an optionally substituted 5- or 6-membered nitrogen-containing aromatic or non-aromatic monocycle; Z is a group —CH(R13)CH2— [in which R13is an optionally substituted aliphatic, cycloaliphatic, heteroaliphatic, heterocycloaliphatic, aromatic or heteroaromatic group], —C(R12a)(R13)—CH(R12b)— [in which R12aand R12btogether with the carbon atoms to which they are attached form a C3-7cycloalkyl group] or C(R13)═CH—; R is a carboxylic acid (—CO2H) or a derivative or biostere thereof; and the salts, solvates, hydrates and N-oxides thereof. The compounds are able to inhibit the binding of αVintegrins to their ligands and are of use in the prophylaxis and treatment of immune or inflammatory disorders.
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