introduced by reductive amination of the DAT scaffold with the respective benzaldehyde derivative. In one compound (60% yield over three steps) the ALA unit is directly bound to the DAT as a relatively electron-withdrawing amide. In solution (CH2Cl2), this material shows strong fluorescence (quantum yield 57% with emission at 495 nm, absorption maximum at 420 nm). The other compound (57% yield over three
通过三步顺序制备两种双功能对苯二甲酸二氨基二甲酸酯 (DAT) 荧光染料,其中包括一个脱保护反应。α-硫辛酸 (ALA) 是一种功能单元,用于将染料结合到金表面。通过酰胺化反应将其引入 DAT 支架。另一个功能单元是对(三氟甲基)苄基,可通过 X 射线光电子能谱 (XPS) 轻松检测表面结合材料。该残基是通过 DAT 支架与相应苯甲醛衍生物的还原胺化引入的。在一种化合物中(三步收率 60%),ALA 单元作为相对吸电子酰胺直接与 DAT 结合。在溶液 (CH 2 Cl 2 ) 中,该材料显示出强荧光(量子产率 57%,发射波长为 495 nm,最大吸收波长为 420 nm)。另一种化合物(三步产率 57%)在 ALA 和 DAT 单元之间具有用于电子解耦的丙烯间隔基,因此观察到红移(在 514 nm 处吸收,在 566 nm 处发射)。然而,量子产率较低(4%)。在这两种化合物的金表面上制备了自组装单分子层,并通过
Electron Transfer and Electron Excitation Processes in 2,5‐Diaminoterephthalate Derivatives with Broad Scope for Functionalization
studied by cyclic voltammetry in dichloromethane. In the absence of a proton donor, DATs should be oxidized in two one‐electron steps. The first step is usually quasi‐reversible while the second step is either quasi‐reversible or irreversible. Some electrochemical properties such as the formal potentials and the ratio between the anodic and the cathodic current were determined from the cyclic voltammograms
2,5-对苯二甲酸二氨基酯 (DAT) 的衍生物是高效的荧光染料,也具有氧化还原活性,因此可以对光谱特性进行电化学操作。通过循环伏安法研究了七种 DAT 衍生物在二氯甲烷中的电化学行为。在没有质子供体的情况下,DAT 应通过两个单电子步骤被氧化。第一步通常是准可逆的,而第二步是准可逆或不可逆的。一些电化学性质,例如形式电势以及阳极和阴极电流之间的比率,是由循环伏安图确定的。对于这种特定类型的染料,建立了第一氧化的形式电位与吸收或荧光发射波长之间的相关性。这些相关性通过密度泛函理论计算得到了证实。
Hydrogen Bond-Induced Rigid Oligoanthranilamide Ribbons That Are Planar and Straight
作者:Zong-Quan Wu、Xi-Kui Jiang、Shi-Zheng Zhu、Zhan-Ting Li
DOI:10.1021/ol036108b
日期:2004.1.1
[GRAPHICS]A new series of oligoanthranilamides has been synthesized starting from suitably modified p-phenylenediamine and p-phthalic acid derivatives. Due to strong intramolecular three-center hydrogen bonds, the new oligomers self-assemble into highly stable straight and planar molecular ribbons, which have been characterized by X-ray crystallography and H-1 NMR, IR, and UV-vis spectroscopy.
Orthogonally Protected Diaminoterephthalate Scaffolds: Installation of Two Functional Units at the Chromophore
作者:Leon Buschbeck、Jens Christoffers
DOI:10.1021/acs.joc.8b00347
日期:2018.4.6
functions were alkylated by reductive amination with side chains carrying amino (orthogonally protected as Boc or Alloc) and carboxylate functions (orthogonally protected as tBu or allyl ester). After sequential deprotections, functional units were introduced by amidation reactions. As three examples, the chromophore was coupled with retinoic acid and fullerene C60 in order to obtain a triad for studying
Zincturns it on! Conjugation of the fluorescence dye diaminoterephthalate with EDTA results in a constitutionally very simple sensor (DAT)2EDTA with remarkable selectivity towards Zn2+ ions. In the presence of one equivalent of Zn(OAc)2 in solution, the fluorescence quantum yield is increased by factor of about six!