9-Phenylcarbazole–Based Hydrazone Twin Compounds as P-Type Organic Semiconductors
摘要:
Hole transporting glass-forming low-molar-mass hydrazones containing 9-phenylcarbazole moiety were synthesized and characterized by NMR-, infrared- and mass spectrometries. The thermal, optical and photoelectrical properties of the synthesized compounds are reported. Compounds containing 1,3-benzendithiol linking bridge were isolated as amorphous materials therefore differential scanning calorimetry experiments revealed glass transitions approximately at 60 degrees C. The ionization potentials of the synthesized compounds were measured by electron photoemission technique in air range from 5.23eV to 5.4eV. Hole drift mobilities in the films of the solid solutions of some of the synthesized hydrazones in bisphenol Z polycarbonate measured by the time-of-flight technique exceed 10-5cm2V-1s-1 at high electric fields.
Organogelation enables fast organolithium cross-coupling reactions in air
作者:Paco Visser、Ben L. Feringa
DOI:10.1039/d3cc00756a
日期:——
on palladium-catalysed cross-coupling reactions using organolithium reagents has seen major breakthroughs in the past decade. However, the use of inert conditions, as well as slow addition of the organolithium species, is generally required. Here we describe the Pd-catalysed cross-coupling of C36H74-gelated organolithium reagents with aryl bromides. The reaction proceeds in 5 min at room temperature
在过去十年中,基于有机锂试剂的钯催化交叉偶联反应的 C-C 键形成取得了重大突破。然而,通常需要使用惰性条件以及缓慢添加有机锂物质。在这里,我们描述了 Pd 催化的 C 36 H 74凝胶化有机锂试剂与芳基溴化物的交叉偶联。反应在室温下进行 5 分钟,同时消除了以前需要的缓慢添加,并严格使用惰性气氛。至关重要的是,有机锂凝胶的使用方便了处理,并极大地提高了过程安全性,不需要任何特殊安全预防措施的克级转化就说明了这一点。