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Hg2＋-Selective fluorescent chemosensor Based on Cation-π Interaction

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Chemical Research in Chinese Universities 2014年第6期30卷 910-914页

作者： YANG Huixiao Department of Chemistry School of Science Collaborative Innovation Center ofChemical Science and Engineering(Tianjin) Tianjin University Tianjin 300072 R R. China

Two sulphur-containing 4-aminonaphthalimide derivatives were investigated as Hg2＋ fluorescent chemosensors. In CH3CN, both sensors present a remarkable fluorescence enhancement to Cu2＋ and Fe3＋, but a selective fluorescence quenching to Hg2＋ among the other metal ions. A cation-π interaction between Hg〉 and the naphthalimide moiety was proposed and confirmed By the density tunetional theory（DFT）.

关键词： 4-Aminonaphthalimide fluorescent chemosensor Cation-π interaction Hg2+ Density functional theory(DFT)

A New fluorescent chemosensor for Selective and Sensitive Detection of Mn²⁺ in Acidic Medium

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Advances in Biological Chemistry 2022年第5期12卷 161-170页

作者： Ay Umit Department of Chemistry Kocaeli University Kocaeli Turkey

Recently, fluorescent sensors have attracted considerable attention in their sensitive and selective determination of heavy metal ions in the aqueous acidic medium due to their advantages such as low cost and easy handling. In this study, the bathocuproine (BCP) compound was used as a fluorescent chemosensor. The selectivity and sensitivity of BCP have been investigated against some metal ions of biological and environmental importance. The results obtained from the ultraviolet-visible region (UV-vis.) and the fluorescence spectroscopy experiments revealed that the BCP sensor showed selectivity and sensitivity only to Manganese (II) ions in the experimental conditions studied. In addition, the binding stoichiometry of BCP and Mn2+ was determined to be 1:1 by the Benesi-Hildebrand method.

关键词： fluorescent chemosensor Mn2+ Fluorescence Quenching Selectivity

Peptide-based fluorescent chemosensor for Cadmium Recognition

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Peptide-based Fluorescent Chemosensor for Cadmium Recognitio...

A Novel fluorescent chemosensor Based on Tetra-peptide for Measuring Zinc Ions in Aqueous Solutions and Live Cells

中国化学会第九届全国无机化学学术会议

作者： Peng Wang Jiang Wu Yu Tang Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province State Key Laboratory of Applied Organic ChemistryCollege of Chemistry and Chemical EngineeringLanzhou University

As all we known,cadmium ions can cause serious diseases and even certain forms of cancers,and also environmental *** use of fluorescent chemosensors for Cd2+recognition could help to discover the cadmium carcinogen mechanism in vivo as well as to detect cadmium ion temporally in the environment.[1]Until now,a number of fluorescent chemosensors have been developed to monitor cadmium concentration,but most of them are organic dyes which may not be suit for in biological system study because of their toxicity and poor water solubility.[2]We propose that linking biological molecule and organic dyes together could reduce the cell toxicity and increase biocompatibility of the chemosensors.[3]A novel peptide fluorescent chemosensor（L）with a lysine backbone and both NH2 sites conjugated with cysteine and dansyl groups has been designed and synthesized by solid phase synthesis with Fmoc *** chemosensor is a promising analytical tool for detecting Cd2+based on chelation enhanced fluorescence（CHEF）effect by turn-on response in 100%aqueous *** designed,L exhibits excellent cell permeation and low biotoxicity as well as displaying high selectivity and *** chemosensor penetrated live He La cells and detected intracellular Cd2+by turn-on *** binding stoichiometry and affinity,interference test,p H sensitivity,fluorescence quantum yield,quantum mechanical calculations,and cytotoxicity of L to Cd2+were also ***,L exhibits excellent cell permeation and low biotoxicity with the limit of detection（LOD）for Cd2+about 52 n M,implying that L can be used as a highly selective and sensitive peptide fluorescent chemosensor in biological systems.

关键词： peptide fluorescent chemosensor cadmium ions

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A Novel Fluorescent Chemosensor Based on Tetra-peptide for M...

Star-shape Tri-benzimidazolyl Molecules:A Fast-response Fluoride Ion fluorescent chemosensor

中国化学会第30届学术年会

fluorescent chemosensor is a powerful analytical tool for the visualization and quantitation of analytes in living cells,tissue slices,and whole *** with a reporter ionophore are very valuable as fluorescent chemosensors,because of their higher biological compatibility and solubility than organic dyes,and more stable than proteins in aqueous ***,we report the design of a novel peptide fluorescent chemosensor(HL) based on tetra-peptide conjugated with dansyl groups,which was synthesized by solid phase peptide *** chemosensor selectively and sensitively detect Znbased on the photo-induced electron transfer(PET) effect by turn-on response in 100%aqueous *** designed,HL has penetrated live Hela cells and detected intracellular Zn by turn-on ***,HL exhibits low biotoxicity with the limit of detection(LOD) for Zn about 57 nM,implying that HL acts as a highly useful peptide fluorescent chemosensor in biological systems.

关键词： Peptide fluorescent chemosensor Zn ions

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Star-shape Tri-benzimidazolyl Molecules:A Fast-response Fluo...

Novel Highly Selective fluorescent chemosensors for Hg（Ⅱ）

中国化学会第十三届全国有机合成化学学术研讨会

作者： Jiang Kai Wu Yan-Cheng Xie Jie-Chun Li Shu-Li Wang Zhao-Yang School of Chemistry and Environment South China Normal University

Although fluoride ion（F-） plays an important and basic role in many chemical and biological processes,excessive fluoride will do harm to our environment and ***,fluoride ion recognition in vitro and in vivo has attracted more and more attention.1 On the basis of our previous studies on benzimidazole-based materials for liquid crystal design and picric acid recognition,2 three star-shape molecules as fluorescent chemosensors in possession of good selectivity,high sensitivity,and fast response toward F-have been created via a simple procedure.3 With the help of fundamental 1 H NMR and DFT calculations studies,we have further demonstrated the deprotonation mechanism of sensing F-（Fig.1）.To get closer to the practical effect towards our surroundings,chemosensors 3 have also been successfully applied in sensing fluoride ion from inorganic origin and commercial toothpaste sample.

关键词： tri-benzimidazolyl star-shape molecule fluorescent chemosensor fluoride detection

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Chemical Research in Chinese Universities 2013年第4期29卷 657-662页

作者： SU Wen-qi YANG Bing-qin Key Laboratory of Synthetic and Natural Functional Molecule Chemistry Ministry of Education Department of Chemistry Northwest University Xi'an 710069 P. R. China

Based on Rhodamine,two novel fluorescent Hg2＋ chemosensors（R1,R2） were synthesized from inexpensive starting *** were designed and synthesized with o-aminophenol and o-phenylenediamine derivatives as the Hg2＋ chelator,the comparison between the photophysical properties of two chemosensor molecules was *** chemosensors were designed with a photoinduced electron transfer（PET） *** binding to Hg2＋ which blocks the PET process,the fluorescence intensity of the chemosensors was enhanced by up to *** exhibit very strong fluorescence responses to Hg2＋ and have remarkably higher selectivity for Hg2＋ than for other metal ions including K＋,Na＋,Ca2＋,Mg2＋,Cd2＋,Mn2＋,Ni2＋,Co2＋,Zn2＋,Cu2＋,Cr3＋,Fe3＋,pb2＋,Ag＋,Al3＋,Fe2＋ and Sn2＋ in Tris-HC1/sodium phosphate *** fluorescence enhancement of R2 towards Hg2＋ maintains stable in wide pH span（6.4-8.8） aqueous solutions.

关键词： fluorescent chemosensor Mercury ion Sensor Rhodamine fluorophore Fluorescence intensity

Colorimetric and Highly Selective Fluorescence ＂Turn-on＂ De-tection of Cr^3＋ by Using a Simple Schiff Base Sensor

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Chinese Journal of Chemistry 2013年第3期31卷 377-380页

作者： Yunxu Yang Huimin Xue Laicheng Chen Ruilong Sheng Xuqin Li Kun Li Department of Chemistry and Chemical Engineering University of Science and Technology of Beij'ing Beijing 100083 China Petrochemical Department Puyang Vocational Technology College Puyang Henan 457000 China Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 China

A simple 8-quinolinecarboxaldehyde derived antipyrine Schiff base （QA） was synthesized and characterized, which exhibited high selectivity to Cr^3＋ over other metal cations. The Cr^3＋ recognition of QA could be achieved by means of fluorescense and absorption spectra, moreover, the obvious color change from colorless to yellowish is easily observed by naked-eyes. The binding constant of QA to Cr^3＋ was evaluated by spectral titration and the binding model was in 1 ： 1 stoichiometry measured by Job＇s plot.

关键词： fluorescent chemosensor 8-quinolinecarboxaldehyde Schiffbase Cr^3+ detection

A New Biphenylcarbonitrile Based fluorescent Sensor for Zn2＋ Ions and Application in Living Ceils

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Chemical Research in Chinese Universities 2017年第5期33卷 695-701页

作者： FENG Jia SHAO Xiuqing SHANG Zhuobin CHAO Jianbin WANG Yu JIN Weijun School of Chemistry and Chemical Engineering Shanxi University Taiyuan 030006 P. R. China College of Chemistry Beijing Normal University Beijing 100875 P. R. China

A new and efficient fluorescent sensor 4＇-hydroxy-3＇-[（4-antipyrineimino）methyl]-4-biphenylcarboni- trile（L） was prepared for the selective detection of Zn2＋ in aqueous ethanol medium. When excited at 419 nm, the fluorescent intensity of sensor L at 507 nm was remarkably increased more than 54-fold after adding Zn2＋ ions. The strong green emission of the solution can be easily identified by naked eye tinder UV light. Thus, sensor L behaves as a naked eye fluorescent ＂turn on＂ detector for Zn2＋ ions. The fluorescence enhancement might be attributed to the in- hibition of excited state intramolecular proton transfer（ESIPT） and C==N isomerization as well as the chelation en- hanced fluorescence（CHEF） effect. The complex solution of sensor L with Zn2＋ ions exhibited reversibility with ethylene diamine tetraacetic acid（EDTA） and the probe could be recycled for further use. Notably, sensor L could clearly distinguish Zn2＋ from Cd2＋. The interaction of sensor L with zinc ions was investigated by means of FTIR, 1H NMR and HRMS spectroscopy. Furthermore, sensor L has been applied for cell imaging studies.

关键词： fluorescent chemosensor Recognition Zn2+ Cell imaging

A fluorescent probe for fluoride ion based on 2-aminopyridyl-bridged calix[6]arene

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Chinese Chemical Letters 2009年第10期20卷 1191-1194页

作者： Jian Hang Mai Jun Min Liu Shao Yong Li Huan Feng Jiang School of Chemistry and Chemical Engineering of Sun Yat-Sen University Guangzhou 510275 China College of Chemistry South China University of Technology Guangzhou 510640 China College of Pharraacy Tianjin Medical University Tianjin 300070 China

An 2-anfinopyddyl-bddged calix[6]arene on the upper rim fixed in cone conformation （3） was successfully synthesized and its highly selective recognition towards fluoride ion was proved by fluorescent and 1H NMR titr... 详细信息

关键词： Calixarene fluorescent chemosensor Fluoride ion