Diferrocenes Bridged by a Geminal Diethynylethene Scaffold with Varying Pendant Substituents: Electronic Interactions in Cross-Conjugated System
作者:Yang Fan、Hua-Min Li、Guo-Dong Zou、Xu Zhang、Ying-Le Pan、Ke-Ke Cao、Meng-Li Zhang、Pei-Lin Ma、Hai-Ting Lu
DOI:10.1021/acs.organomet.7b00686
日期:2017.11.13
between the ferrocenyl (Fc) termini. Hush analysis of the intervalence charge-transfer (IVCT) bands for the monocation species is suggestive of the weakly coupled Robin–Day class II mixed-valence compounds. DFT and TDDFT calculations suggest that the low-energy transitions of these compounds mainly involve a metal to ligand charge transfer (MLCT) transition from the iron center of ferrocenyl termini to
Reductive Bergman-Type Cyclizations of Cross-Conjugated Enediynes to Fulvene and Fulvalene Anions: The Role of the Substituent
作者:Noach Treitel、Lior Eshdat、Tuvia Sheradsky、Patrick M. Donovan、Rik R. Tykwinski、Lawrence T. Scott、Henning Hopf、Mordecai Rabinovitz
DOI:10.1021/ja0566477
日期:2006.4.1
Various cross-conjugated enediynes undergo "Bergman-type" cycloaromatizations upon reduction with potassium metal, generating anions of fulvenes and fulvalene derivatives. This new anionic cyclization is considerably more facile than the classic Bergman cyclization with linear enediynes, creating highly reactive diradicals at -78 degrees C. Not all cross-conjugated enediynes yield cyclized dianions
Palladium-Catalyzed Annulation of Phenazastannines with 9-(Dibromomethylene)fluorene and -(thio)xanthenes: Facile Synthesis of Acridine Moiety-Containing Bis(tricyclic) Aromatic Enes
Growing interest has been paid to bis(tricyclic) aromatic enes as key components of functional organic materials such as molecular switches and charge-transporting materials. Currently, the synthetic approaches to the overcrowded alkenes are limited to McMurry coupling and Barton–Kellog olefination. This communication reports that palladium-catalyzed double cross-coupling reaction of phenazastannines
groups as hole-transporting units were designed and synthesized. The synthesized AIE-active materials are highly thermally stable and exhibit wide band gaps with blue fluorescence emissions positioned at 434–473 nm in the solid state. The use of the diphenylamine substituted sulfur-bridged TPE molecule in a non-doped OLED and in its doped OLED results in similarly good device performances, in which all
纯色深蓝色有机发光二极管(OLED)具有450-460 nm范围内的电致发光发射峰,并且具有很高的外部量子效率。选择硫桥联四苯乙烯(TPE)作为荧光团核心,以开发具有纯色深蓝色发射和聚集诱导发射(AIE)特性的新材料。设计并合成了四种引入咔唑和二苯胺基作为空穴传输单元的化合物。合成的AIE活性材料具有很高的热稳定性,并显示宽带隙,固态时蓝色荧光发射位于434-473 nm之间。在未掺杂的OLED及其掺杂的OLED中使用二苯胺取代的硫桥联TPE分子可产生类似的良好器件性能,其中所有掺杂的OLED器件都显示纯净的深蓝色发射光,其半峰宽(56–65 nm)的全宽较窄,电致发光峰在452–454 nm处。其最佳外部量子效率为2.75%,最大且实用的亮度为4277 cd m-2,是基于AIE材料的最好的纯色深蓝色OLED之一。