an effective strategy to improve their electron mobilities by introducing electron‐withdrawinggroups (EWGs, such as F, Cl, or CF3) into the polymer backbone. However, the introduction of different EWGs always requires a different synthetic approach, leading to additional arduous work. Here, an effective two‐step method is developed to obtain EWG substituted bay‐annulated indigo (BAI) units. This method
对于供体-受体共轭聚合物,通过将吸电子基团(EWG,例如F,Cl或CF 3)引入聚合物主链,是提高其电子迁移率的有效策略。但是,引入不同的EWG总是需要不同的综合方法,从而导致额外的艰巨工作。在这里,开发了一种有效的两步法来获得EWG取代的月季靛(BAI)单位。此方法可有效地将各种EWG(F,Cl或CF 3)引入BAI的不同取代位置。基于此方法,EWG取代了BAI受体,包括2FBAI,2ClBAI和2CF 3BAI,是首次报道。此外,还开发了PBAI-V,P2FBAI-V,P2ClBAI-V和P4OBAI-V四种聚合物。所有聚合物均显示出双极性传输性质。特别是,P2ClBAI-V表现出显着的空穴迁移率和电子迁移率,分别为4.04和1.46 cm 2 V -1 s -1。这些迁移率是基于BAI的聚合物的最高价值。
Evolving a P450BM3 Peroxygenase for the Production of Indigoid Dyes from Indoles
Enzymatic Approach for the Biosynthesis of IndigoidDyes: A stepwise laboratory evolution of P450 enzyme is developed and used to establish an environmentally benign enzymatic approach for the biosynthesis of indigoiddyes from indole derivatives with high isolation yields, improving upon existing methods.
Characterization of the Excited States of Indigo Derivatives in their Reduced Forms
作者:Raquel Rondão、J. Sérgio Seixas de Melo、Gundula Voss
DOI:10.1002/cphc.201000082
日期:2010.4.16
A comprehensive characterization of the electronic spectral and photophysical properties of the leuco (reduced) form of several indigoderivatives, including indigo and Tyrian Purple, with di‐, tetra‐, and hexa‐substitution, was obtained in solution. The characterization involves absorption, fluorescence, and triplet–triplet absorption spectra, together with quantitative measurements of quantum yields
ancient times, people have been attracted by dyes and they were a symbol of power. Some of the oldest dyes are indigo and its derivative Tyrian purple, which were extracted from plants and snails, respectively. These ‘indigoiddyes’ were and still are used for coloration of textiles and as a food additive. Traditional Chinese medicine also knows indigoiddyes as pharmacologically active compounds and