Designing Interfaces That Function to Facilitate Charge Injection in Organic Light-Emitting Diodes
摘要:
Layer-by-layer (LbL) assembly of triarylamine (TAA)-containing polymers has been applied for anode functionalizations in organic light-emitting diodes (OLEDs). Surface work function of the ITO electrodes was significantly altered with the functionalizations, and the values changed depending on electron affinity of the substituents (X) on the TAA units. When the functionalized ITO electrodes were utilized for the conventional TPD/Alq OLED, the multilayers of P1 (X = 4-OMe) and P2 (X = none) were found to promote better energy matching at the ITO/TPD interface to reduce the hole injection barrier. Furthermore, the multilayers having heterodeposited structure of several TAA polymers provided stepped and graded electronic profiles to facilitate hole mobility from ITO to TPD, so that the resulting OLED devices can exhibit appreciably reduced turn-on voltage and higher luminous intensities.
Cu-Catalyzed Cross-Coupling of Nitroarenes with Aryl Boronic Acids to Construct Diarylamines
作者:Xinyu Guan、Haoran Zhu、Tom G. Driver
DOI:10.1021/acscatal.1c03113
日期:2021.10.15
copper-catalyzed reaction of nitroarenes with arylboronicacids to form diarylamines that uses phenyl silane as the stoichiometric terminal reductant is described. This cross-coupling reaction requires as little as 2 mol % of CuX and 4 mol % of diphosphine for success and tolerates a broad range of functional groups on either the nitroarene or the arylboronicacid to afford the amine in good yield. Mechanistic
ethyl diazoacetate, diarylamines, and styrene-type alkenes is described. This novel 1,2-difunctionalization of alkenes can be readily achieved under a simple operation and mild conditions, affording γ-amino esters as major products. The reaction proceeds through the generation of carbon-centered radicals from diazo compounds by a visible-light-promoted proton-coupled electron transfer (PCET) process.
A protocol for the one-pot synthesis of diarylamines via Smilesrearrangement under microwave irradiation has been developed. Various diarylamines were effectively synthesized starting from readily available substituted phenols, arylamines and chloroacetyl chloride in moderate to good yields (58–92%).
Acid-Free Synthesis of Carbazoles and Carbazolequinones by Intramolecular Pd-Catalyzed, Microwave-Assisted Oxidative Biaryl Coupling Reactions - Efficient Syntheses of Murrayafoline A, 2-Methoxy-3-methylcarbazole, and Glycozolidine
作者:Vellaisamy Sridharan、M. Antonia Martín、J. Carlos Menéndez
DOI:10.1002/ejoc.200900537
日期:2009.9
A mild and efficient methodology for the synthesis of oxygenated carbazoles from diarylamines under non-acidic conditions was developed, based on a palladium-catalyzed, microwave-assisted double C–H bond activation process. This new protocol was successfully applied to the synthesis of three naturally occurring carbazoles, namely murrayafoline A, 2-methoxy-3-methylcarbazole, and glycozolidine. The
Cu-ACP-Am-Fe3O4@SiO2: an efficient and recyclable heterogeneous catalyst for the Chan–Lam coupling reaction of boronic acids and amines
作者:Sandip P. Vibhute、Pradeep M. Mhaldar、Dipak S. Gaikwad、Rajendra V. Shejwal、Dattaprasad M. Pore
DOI:10.1007/s00706-019-02529-w
日期:2020.1
AbstractWe have developed an efficient method for Cu-ACP-Am-Fe3O4@SiO2 catalyzed Chan–Lamcoupling of phenylboronic acid with primary amine furnished secondary amines. The catalyst offered virtues like mild reaction conditions, magnetically separable, and reusable and exhibits excellent performance in terms of good product yield and high turnover number. Graphic abstract
摘要我们已经开发出一种有效的方法,用于Cu-ACP-Am-Fe 3 O 4 @SiO 2催化苯基硼酸与伯胺提供的仲胺的Chan-Lam偶联。该催化剂具有温和的反应条件,可磁分离和可重复使用的优点,并在良好的产物收率和高周转率方面表现出优异的性能。 图形摘要