一系列具有不同含量的喹啉基铱配合物(PPQ)2 Ir(acac)(双(2,4-二苯基喹啉基-N,C 2')铱(乙酰丙酮)的红色发光的电致发光聚芴(PF ) ),在侧链上通过铃木缩聚合成。由于从PF主链到(PPQ)2 Ir(acac)的有效Förster能量转移以及络合物上的直接电荷俘获,即使掺入聚合物中的铱络合物的量也几乎完全消除了PF的电致发光低至1mol%。基于单层设备配置,发光效率高达5.0 cd A -1,亮度为2000 cd m -2和国际照明委员会的坐标为(0.63,0.35)(x,y),这远远优于以前报道的含苯并噻唑基和异喹啉基铱络合物的发红光的PF。这一结果超出了预期,尤其是考虑到所涉及的简单聚合物链没有额外的电荷传输部分时。值得注意的是,该设备的效率仍高达4.2光盘-1与4000 CD m 2的亮度-2即使在100mA厘米的电流密度-2。通过结合额外的电子注入层进一步优化器件配置,从而提高了8
By using aldehydes or ketones as the catalyst and screening CsOH out as the more effective base than KOH in many instances, an efficient 9-C-alkylation of fluorenes with alcohols was...
central goal in catalysis. This would be especially interesting when the reactivity and selectivity patterns can be tuned. Herein, we introduced the first Mn-catalyzed selective C-alkylation and olefination of fluorene, and indene with alcohols. Various substrates including benzylic, heteroaromatic, and aliphatic primary and secondary alcohols are employed as alkylating agents. Mechanistic investigations
Triplet Energy Back Transfer in Conjugated Polymers with Pendant Phosphorescent Iridium Complexes
作者:Nicholas R. Evans、Lekshmi Sudha Devi、Chris S. K. Mak、Scott E. Watkins、Sofia I. Pascu、Anna Köhler、Richard H. Friend、Charlotte K. Williams、Andrew B. Holmes
DOI:10.1021/ja0584267
日期:2006.5.1
phosphorescent iridiumcomplex 13 and a conjugated polymer, polyfluorene, has been investigated in electrophosphorescent organic light-emitting diodes. Red-emitting phosphorescent iridiumcomplexes based on the [Ir(btp)(2)(acac)] fragment (where btp is 2-(2'-benzo[b]thienyl)pyridinato and acac is acetylacetonate) have been attached either directly (spacerless) or through a -(CH(2))(8)- chain (octamethylene-tethered)
<i>t</i>-BuOK-catalysed alkylation of fluorene with alcohols: a highly green route to 9-monoalkylfluorene derivatives
作者:Jiang-Tao Fan、Xin-Heng Fan、Cai-Yan Gao、Zhenpeng Wang、Lian-Ming Yang
DOI:10.1039/c9ra07557g
日期:——
A simple, mild and efficient protocol was developed for the alkylation of fluorene with alcohols in the presence of t-BuOK as catalyst, affording the desired 9-monoalkylfluorenes with near quantitative yields in most cases.