摘要
以咔唑、5-羟基-1,3-苯二甲酸二乙酯和1,4-二溴丁烷为原料,经缩合、水解等步骤合成了一种新型荧光配体N-[4-(3,5-二羧基苯氧基)-丁基]咔唑,并利用傅里叶变换红外光谱、核磁共振氢谱及单晶X-射线衍射对其结构进行了表征,该化合物具有很强的荧光特性。在乙醇/水混合介质中,Fe3+的存在会导致化合物的荧光强度显著降低,显示出高效的Fe3+选择性"开-关"行为。最大淬灭率达到86%,这种强的荧光淬灭效应是化合物和Fe3+离子发生配位作用的结果。荧光滴定实验和体系红外光谱数据表明,在溶液中,化合物与Fe3+之间的结合是一种多分子的协同配位模式。
A new fluorescent ligand,N-[4-( 3,5-dicarboxylphenoxy)-butyl]-carbazole was synthesized from carbazole,diethyl 5-hydroxyisophthalate and 1,4-dibromobutane through condensation and hydrolysis. And its molecular structure was confirmed by Fourier transform infrared spectroscopy,proton nuclear magnetic resonance spectra and X-ray single-crystal diffraction.This compound has strong fluorescence property.In ethanol/water solution,the fluorescence intensity at 352 nm decreased significantly in the presence of Fe3+due to the coordination with Fe3+ion,indicating an efficient Fe3+-selective"on-off"behavior.The quenching rate was up to 86%.The results of fluorescence titration experiment and infrared spectroscopy of the system indicated a polymolecular cooperative coordination binding mode between the compound and Fe3+.
引文
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