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。
Exploring the biocatalytic scope of a bacterial flavin-containing monooxygenase
作者:Ana Rioz-Martínez、Malgorzata Kopacz、Gonzalo de Gonzalo、Daniel E. Torres Pazmiño、Vicente Gotor、Marco W. Fraaije
DOI:10.1039/c0ob00988a
日期:——
A bacterial flavin-containing monooxygenase (FMO), fused to phosphite dehydrogenase, has been used to explore its biocatalytic potential. The bifunctional biocatalyst could be expressed in high amounts in Escherichia coli and was able to oxidize indole and indole derivatives into a variety of indigo compounds. The monooxygenase also performs the sulfoxidation of a wide range of prochiral sulfides, showing moderate to good enantioselectivities in forming chiral sulfoxides.
Novel Arylindigoids by Late‐Stage Derivatization of Biocatalytically Synthesized Dibromoindigo
作者:Christian Schnepel、Veronica I. Dodero、Norbert Sewald
DOI:10.1002/chem.202005191
日期:2021.3.22
compounds applicable as organic semiconductors and photoresponsive materials. Yet modified indigo derivatives are difficult to access by chemical synthesis. A biocatalytic approach applying several consecutive selective C−H functionalizations was developed that selectively provides access to various indigoids: Enzymatic halogenation of l‐tryptophan followed by indole generation with tryptophanase yields 5‐
An iodine effect in ambipolar organic field-effect transistors based on indigo derivatives
作者:Oratai Pitayatanakul、Kodai Iijima、Minoru Ashizawa、Tadashi Kawamoto、Hidetoshi Matsumoto、Takehiko Mori
DOI:10.1039/c5tc01023c
日期:——
crystals. In addition, the iodine–iodineinteraction provides extraordinarily large interchain interaction. However, the X-ray diffraction suggests that the indigo molecules are arranged approximately perpendicular to the substrate in the thin films, probably due to the extra iodine–iodineinteraction. The remarkable performance is ascribed to this characteristic supramolecular interaction.