Quinoxaline−Imidazolium Receptors for Unique Sensing of Pyrophosphate and Acetate by Charge Transfer
作者:N. Jiten Singh、Eun Jin Jun、Kavitha Chellappan、Daniel Thangadurai、R. Prakash Chandran、In-Chul Hwang、Juyoung Yoon、Kwang S. Kim
DOI:10.1021/ol062849b
日期:2007.2.1
Quinoxaline derivatives (1-4) bearing two imidazolium moieties are found to strongly bind anions and show unique charge-transfer fluorescent responses to pyrophosphate and acetate, whereas they show excimer formation with other anions. Anion-binding studies are investigated with fluorescence and H-1 NMR analysis, single-crystal X-ray analysis, and theoretical calculations.
Synthesis of two tetra-azolium salts and the recognition performance for guests
作者:Zhi-Xiang Zhao、Lin-Hai Hu、Shao-Cong Yu、Qing-Xiang Liu
DOI:10.1039/d2nj04255j
日期:——
One open tetra-benzimidazolium salt (1) and one cyclic tetra-imidazoliumsalt (2) based on tetramethylbenzene were synthesized and characterized. The single crystal structure of 1 was determined by X-ray diffraction. The recognition performance of compounds 1 and 2 for guests (1 for o-phenylenediamine (OPD) and 2 for F−) was investigated via fluorescent spectra, UV/vis spectra, 1H NMR, HRMS and IR
合成并表征了一种基于四甲基苯的开放式四苯并咪唑盐( 1 )和一种环状四咪唑盐( 2 )。1的单晶结构由X射线衍射确定。通过荧光光谱、UV/vis 光谱、1 H NMR、HRMS 和 IR 光谱研究了化合物1和2对客体的识别性能(1用于邻苯二胺 (OPD),2用于 F -) 。特别是在识别F 2的过程中观察到了显着的颜色变化(从无色到浅棕色)−,表明这种识别不仅可以通过仪器进行,也可以通过肉眼进行,在实践中具有很大的便利性。