Novel highly efficient fluoroionophores with a peri-effect and strong electron-donating receptors: TICT-promoted PET and signaling response to transition metal cations with low background emission
摘要:
Novel fluoroionophores with piperazine frameworks as receptors for transition metal cations have been designed with the aid of calculation and synthesized. They exhibited low background emission and highly efficient fluorescence enhancements upon complexation with different transition metal cations, which could be ascribed to the special contribution of the TICT-promoted PET processes caused by the peri-effect and strong electron-donating receptors. (C) 2003 Elsevier Science Ltd. All rights reserved.
Expeditious synthesis of diverse spiro fused quinoxaline derivatives using magnetically separable core-shell CoFe<sub>2</sub>
O<sub>4</sub>
@SiO<sub>2</sub>
-SO<sub>3</sub>
H nanocatalyst under ultrasonication
A magnetically separable core–shell CoFe2O4@SiO2‐SO3H nanocatalyst has been successfully exploited as a heterogeneous acid catalyst in the synthesis of diversely substituted biologically important spiro fused pyrrolo/indolo[1,2‐a]quinoxaline derivatives through the condensation of N‐(2‐aminophenyl)pyrroles/indoles and various cyclic conjugated 1,2‐diones in ethanol under ultrasonic irradiation. Room
reaction is not a simple substitution of the hydroxy group with amines, but goes through imine formation followed by 1,2-C migration. The reaction provides good opportunity for the synthesis of opticallyactive α-amino ketones. We have achieved facile synthesis of some chromatographically separable and opticallyactive tert-α-amino ketones by employing S-(−) or R-(+)-α-methylbenzylamines in the Voight
A Convenient One-Pot Synthesis of Acenaphthenequinones from 1-Acenaphthenones by NBS–DMSO Oxidation
作者:Jiro Tatsugi、Shigeo Okumura、Yasuji Izawa
DOI:10.1246/bcsj.59.3311
日期:1986.10
Acenaphthenequinone was obtained in 95% yield when the reaction of 1-acenaphthenone with N-bromosuccinimide was carried out in dimethyl sulfoxide at room temperature. Under similar conditions, several acenaphthenequinones were prepared from the corresponding 1-acenaphthenones in good yields.
Substituent effects on the decomposition of chemiluminescent tricyclic aromatic dioxetanes
作者:Chung-Wen Sun、Shun-Chi Chen、Tai-Shan Fang
DOI:10.1002/bio.2568
日期:2014.8
It was observed that the CL from compound 2a is red‐shifted relative to that of compounds 1a and 3a suggesting a higher degree of stabilization for the excited state by the electron‐donating methoxy group. Also, a study of the solvent effect on fluorescence shows a significant red‐shift in compound 2b, indicating a more polar excited state. The kinetics of the thermal decomposition of the 1,2‐dioxetanes
通过与单线态氧(1 O 2)反应,由它们相应的1,4-二恶英化合物1,3和2合成了三个三环1,2-二氧杂环丁烷衍生物1a,2a和3a)在二氯甲烷中。通过化学发光(CL)提供了形成二氧环乙烷1a,2a和3a的证据,化学发光(CL)与电子激发的二酯1b *,2b *和3b *的发射相对,后者从二氧杂环丁烷1a,2a和3b热分解。 3a分别。高张力的1,2-二氧杂环丁烷环通过同时断裂O-O和C-C键而从扭曲的几何结构分解,从而产生发射CL的电子激发二酯。可以观察到,化合物2a的CL相对于化合物1a和3a的CL发生了红移,这表明供电子甲氧基对激发态具有更高的稳定性。另外,对溶剂对荧光的影响的研究表明,化合物2b中存在明显的红移,表明极性更强。1,2-二氧杂环丁烷的热分解动力学清楚地表明,化合物2a的CL特性与化合物1a和3a的CL特性完全不同。这些结果与由化合物2a的给电子基团触发的分子内化学引发
Synthesis, Crystal Structure, and DFT Study of Two New Dinuclear Copper(I) Complexes Bearing Ar‐BIAN Ligands Functionalized with NO
<sub>2</sub>
Groups
作者:Mani Outis、Vitor Rosa、César A. T. Laia、João Carlos Lima、Sónia Barroso、Ana Luísa Carvalho、Maria José Calhorda、Teresa Avilés
DOI:10.1002/ejic.202000423
日期:2020.8.16
iodide bridged copper(I) complexes [Cu2(µ‐I)2(mes‐BIAN‐5‐NO2)2], 3 and [Cu2(µ‐I)2(mes‐BIAN‐4‐NO2)2], 4 , were obtained in good yields by treatment with an equimolar amount of CuI. All compounds were characterized by elemental analysis, single‐crystal X‐ray diffraction, 1H‐NMR, 13C‐NMR, FTIR, UV/Vis spectroscopy. DFT calculations helped to understand the different molecular structure observed in the