基于蒽酰亚胺基团的新型Fe~(3+)和Hg~(2+)化学敏感器

含蒽酰亚胺基团的化合物N-(2-(6-氨基吡啶))-9-蒽酰亚胺(L1)对Fe3+表现出灵敏的荧光增强响应.L1的衍生物N,N-′(2,6-吡啶基)-二(9-蒽酰亚胺)(L2)对Hg2+在紫外-可见吸收光谱和荧光光谱上显示了良好的识别性.即使在其它金属阳离子存在下,L1和L2分别对于Fe3+和Hg2+仍然表现出较好的选择性.     

A bipyridine-containing water-soluble conjugated polymer: Highly efficient fluorescence chemosensor for convenient transition metal ion detection in aqueous solution

A novel sulfonato-functionalized water-soluble conjugated polymer (WSCP), which containing 2′2-bipyridine units as receptors for transition metal ions in the main chain was successfully synthesized by Sonogashira-coupling reaction for the first time. This polymer could easily dissolve in water (5 mg/mL) and some polar organic solvents such as methanol. Its fluorescence in aqueous solution can be completely quenched upon addition of transition metal ions. The K_sv of different transition metal ions in aqueous solution were much higher than previous reports in organic solutions and showed highest selectivity to Ni²⁺. These results opened opportunities for developing novel chemosensors by introducing selective fluorescent chromophore into the water-soluble conjugated backbone.     

基于萘二酰胺衍生物的氟离子荧光传感器

设计合成了一个以萘酰胺衍生物为荧光团,硫脲基团为键合基团的荧光化学传感器1。化学传感器1对氟离子表现出了较好的荧光响应性。随着氟离子浓度的增加,荧光强度先表现为增强,这是由于氟离子加入后可以和化学传感器1中硫脲基团上的氢原子形成氢键,从而增强了萘酰胺4-位取代基的给电子能力。随着氟离子浓度的继续增加,化学传感器1表现为荧光强度的降低。在对磷酸二氢根离子的实验中,化学传感器1则没有表现出较明显的荧光变化。     

基于萘酰亚胺为发光团的新型荧光探针分子的合成

高产率合成一种新的以硫氮杂冠醚为识别位点的萘酰亚胺类荧光探针分子。该合成方法具有反应条件温和、容易提纯等优点。所得到的化合物结构经IR、NMR、MS以及元素分析确定。     

光学活性1,1'-联-2-萘酚类合成受体的应用研究新进展

具有光学活性的1,1'-联-2-萘酚及其衍生物由于其本身具有C2对称轴而具有独特的化学性质和手性诱导功能,且在适合结构基团修饰下能产生很强的荧光,在不对称催化和手性客体的荧光识别等方面得到了广泛的应用.在与手性胺、手性醇、糖类、手性阴离子、手性氨基醇和手性氨基酸等手性化合物作用时,该类受体在不同位点接受客体分子,通过光...     

A highly sensitive and selective colorimetric and off-on fluorescent chemosensor for Cu based on rhodamine B derivative

A new rhodamine B derivative colorimetric and fluorescent sensor (1) was synthesized by condensation reaction of rhodamine B hydrazide and 2,4-dihydroxybenzaldehyde, which showed reversible and highly selective and sensitive recognition toward Cu²⁺ over other examined metal ions. Upon addition of Cu²⁺, sensor 1 exhibits remarkably enhanced absorbance intensity and color change from colorless to pink in DMSO and MeCN aqueous buffer solution or pure MeCN, and shows significant off-on fluorescence accompanied by color changes from colorless to orange in MeCN. The sensor 1 was also successfully applied to the determination of Cu²⁺ in water samples.     

Fluoranthene-based pyridine as fluorescent chemosensor for Fe

A fluoranthene based fluorescent chemosensor 2-(7,10-diphenyl-fluoranthen-8-yl)-pyridine (B) which shows excellent selectivity towards Fe³⁺ is described. Upon addition of FeCl₃ into the ethanol solution of B, it exhibits a great decrease of emission intensity against environmental and biological samples. Further experiments demonstrate that Fe(NO₃)₃ has the similar influence as FeCl₃ on the emission spectra of B while Fe₂(SO₄)₃ has no influence on that of B.     

A minimized fluorescent chemosensor array utilizing carboxylate-attached polythiophenes on a chip for metal ions detection

Chemosensor arrays have a great potential for on-site applications in real-world scenarios.However,to fabricate on chemosensor array a number of chemosensors are required to obtain various optical patterns for multianalyte detection.Herein,we propose a minimized chemosensor array composed of only two types of carboxylate-functionalized polythiophene derivatives for the detection of eight types of metal ions.Upon recognition of the metal ions,the polythiophenes exhibited changes in their fluorescence intensity and various spectral shifts.Although both chemosensors have the same polymer backbone and recognition moiety,only the difference in the number of methylene groups contributed to the difference in the fluorescence response patterns.Consequently,the metal ions in aqueous media were successfully discriminated qualitatively and quantitatively by the chemosensor microarray on the glass chip.This study offers an approach for achieving a minimized chemosensor array just by changing the alkyl chain lengths without the necessity for many receptors and reporters.     

氟离子荧光化学传感器的研究进展

近年来氟离子荧光化学传感器的研究受到了极大的关注。许许多多具有简便易用、反应迅速、准确灵敏等特性的氟离子荧光传感器出现在生物医用、纳米材料科学和环境科学等领域。该文主要回顾了从2009年到2011年国内外设计合成出来的重要氟离子荧光化学传感器分子并按照受体分子和氟离子的作用类型来分类进行了评述,同时展望了氟离子传感器的未来发展趋势。