Iridium(iii) complexes with enhanced film amorphism as guests for efficient orange solution-processed single-layer PhOLEDs with low efficiency roll-off
摘要:
通过在 2-苯基苯并噻唑配体苯基段的元位上引入苯基取代基,合成了两种新型橙色铱(III)配合物,即 (3Phbt)222Ir(acac) 和 (3OMePhbt)222Ir(acac)。与母体化合物 (bt)222Ir(acac) 相比,这两种化合物的热稳定性和薄膜非晶性都大大增强,因此适合作为高性能溶液处理磷光有机发光二极管(PhOLED)的客体。然而,与(bt)222Ir(acac)相比,含有对位苯基的(4Phbt)222Ir(acac)具有更差的可加工性,这是因为强烈的分子间相互作用会导致自发结晶。以 (3Phbt)222Ir(acac) 和 (3OMePhbt)222Ir(acac) 为客体的单层溶液加工 PhOLED 的峰值电流效率分别为 17.2 cd A-1 和 15.2 cd A-1,最大亮度分别为 28 270 cd m-2 和 27 900 cd m-2。与采用(bt)222Ir(acac)(10.2 cd A-1 和 14 350 cd m-2)和(4Phbt)222Ir(acac)(5.0 cd A-1 和 13 790 cd m-2)作为荧光粉的器件相比,这两种荧光粉的亮度都有很大提高。此外,这些设备在高亮度下的效率衰减非常低。这些目标配合物的电致发光性能之所以大大提高,主要是由于环金属配体的适当取代位点上存在一个刚性苯基,从而提高了热稳定性,减轻了分子间的相互作用,进而增强了薄膜的非结晶性。
Synthesis of Quinazolinones and Benzothiazoles Using α-Keto Acids under Ball Milling
作者:Anoop Sharma、Jitender Singh、Anuj Sharma
DOI:10.1021/acs.joc.3c02435
日期:2024.4.19
(23 derivatives) and benzothiazoles (23 derivatives) has been developed through stainless-steel-driven decarboxylative acyl radical generation from α-keto acids. A library of 2-arylquinazolinones and 2-arylbenzothiazoles has been prepared in moderate to good yields at room temperature. Moreover, control experiments and XPS studies supported the reduction (by zerovalent iron) of molecular oxygen through
机械化学是指通过机械力(例如铣削、研磨或剪切)引发化学反应以实现化学转变。作为机械催化的体现,本文通过不锈钢驱动的 α-酮酸脱羧酰基自由基生成,开发了一种无氧化剂和无溶剂的喹唑啉酮(23 种衍生物)和苯并噻唑(23 种衍生物)的合成方法。 2-芳基喹唑啉酮和2-芳基苯并噻唑库已在室温下以中等至良好的产率制备。此外,控制实验和 XPS 研究支持通过球的适度磨损来还原分子氧(通过零价铁),从而通过 SET 过程促进超氧自由基阴离子的生成。
Synthesis of 2-Arylbenzothiazole Derivatives Based on Activated Carbon/Oxygen Oxidation Followed by Suzuki-Miyaura Coupling
作者:Masahiko Hayashi、Vasudevan Dhayalan
DOI:10.1055/s-0031-1289772
日期:2012.7
A variety of 2-arylbenzothiazole derivatives were synthesized by the reaction of 2-aminobenzenethiol with substituted benzaldehydes in the presence of activated carbon and molecular oxygen system followed by Suzuki-Miyaura coupling using 2-phenylimidazole-PdCl2 complex.
Vernin,G. et al., Comptes Rendus des Seances de l'Academie des Sciences, Serie C: Sciences Chimiques, 1969, vol. 268, p. 977 - 979