Proaromaticity: Organic Charge-Transfer Chromophores with Small HOMO-LUMO Gaps
作者:Yi-Lin Wu、Filip Bureš、Peter D. Jarowski、W. Bernd Schweizer、Corinne Boudon、Jean-Paul Gisselbrecht、François Diederich
DOI:10.1002/chem.201001051
日期:2010.8.16
prepared and investigated to validate proaromaticity as a concept for reducing HOMO–LUMOgaps in push–pull chromophores. Analyses of IR, 1H NMR, and UV/Vis/NIR spectra in conjunction with molecular structures determined by X‐ray diffraction show that these push–pull quinoids have significant charge‐separated ground states. This feature results in small optical gaps (near IR region) and diatropic magnetic
制备并研究了基于醌或扩展醌的新颖的供体和/或受体取代的交叉共轭碳环,其环半径为radianannulene,并验证了前芳香性是减少推挽发色团中HOMO-LUMO间隙的概念。红外分析11 H NMR,UV / Vis / NIR光谱以及X射线衍射确定的分子结构表明,这些推挽式醌类化合物具有明显的电荷分离基态。如原子核无关的化学位移(NICS)计算所建议的那样,此功能会导致较小的光学间隙(靠近IR区域)和碳环化合物内部的变质磁性环境。NICS的结果以及对醌类间隔基的键长分析提供了有力的支持,即芳香性,即在基态下芳构化的两性离子介观贡献是有效的。推挽式四(乙炔二基)-扩展的醌型生色团代表了第一个芳香族的a基环戊二烯。
Remote steric control for undirected
<i>meta</i>
-selective C–H activation of arenes
Regioselective functionalization of arenes remains a challenging problem in organic synthesis. Steric interactions are often used to block sites adjacent to a given substituent, but they do not distinguish the remaining remote sites. We report a strategy based on remote steric control, whereby a roof-like ligand protects the distant para site in addition to the ortho sites, and thereby enables selective
Synthesis and optical properties, including fluorosolvatochromic and ICT-based proton-sensing behaviors of a series of 2,4,6-tris(5-aryl-2-thienyl)pyridines
作者:Hiroki Muraoka、Takumi Obara、Satoshi Ogawa
DOI:10.1080/10426507.2019.1603230
日期:2019.7.3
Abstract A series of 2,4,6-tris(5-aryl-2-thienyl)pyridines with a star-shaped π–conjugated (D-π)3-A system, which consist of an electron deficient pyridine core (A) and three aryl groups with an electron-donating substituent (D) linked by a thiophene spacer (π-spacer), were designed and systematically synthesized. The optical properties of these molecules in the solution and solid states, which were
Systematic synthesis, comparative studies of the optical properties, and the ICT-based sensor properties of a series of 2,4,6-tri(5-aryl-2-thienyl)pyrimidines with the D–π–A system
作者:Hiroki Muraoka、Takumi Obara、Satoshi Ogawa
DOI:10.1016/j.tetlet.2016.05.099
日期:2016.7
A series of 2,4,6-tri(5-aryl-2-thienyl)pyrimidines with a star-shaped D–π–A system, which have an electron deficient pyrimidine core (A) and three donor type aryl groups (D) linked by a thiophene spacer (π-spacer), were designed and systematically synthesized. Through the characterization of the molecules by UV–vis absorption and fluorescence spectroscopies, we revealed that the molecules possess distinct
一系列具有星形D–π–A系统的2,4,6-三(5-芳基-2-噻吩基)嘧啶,具有一个缺电子的嘧啶核(A)和三个供体型芳基(D设计并系统合成了由噻吩间隔子(π-spacer)连接的)。通过紫外可见吸收和荧光光谱对分子的表征,我们发现分子具有不同的吸收和发射波长,这些波长受末端芳基的供体效应控制。有趣的是,2,4,6-tris(5- p - N,N基于其分子内电荷转移(ICT)和基本特性,发现-二丁基氨基苯基-2-噻吩基)嘧啶具有很强的氟溶剂变色性质和质子敏感性,可使其用作极性或质子传感器。
A Series of 2,5-Bis(5-aryl-2-thienyl)pyrazines with a Linear-Shaped (D-π)<sub>2</sub>-A System: Synthesis and Study of the Optical Properties Including Fluorosolvatochromism and Proton-Base-Sensing
作者:Hiroki Muraoka、Naoki Iwabuchi、Satoshi Ogawa
DOI:10.1246/bcsj.20190101
日期:2019.8.15
A series of 2,5-bis(5-aryl-2-thienyl)pyrazines with distinct optical properties tuned by the intramolecular charge transfer (ICT) degree based on the donor strength of the aryl groups have been syn...