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 han...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 Mn<sup>2+</sup> was determined to be 1:1 by the Benesi-Hildebrand method.展开更多
Based on Rhodamine,two novel fluorescent Hg2+ chemosensors(R1,R2) were synthesized from inexpensive starting materials.They were designed and synthesized with o-aminophenol and o-phenylenediamine derivatives as the...Based on Rhodamine,two novel fluorescent Hg2+ chemosensors(R1,R2) were synthesized from inexpensive starting materials.They 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 made.The chemosensors were designed with a photoinduced electron transfer(PET) mechanism.After binding to Hg2+ which blocks the PET process,the fluorescence intensity of the chemosensors was enhanced by up to 15-fold.They 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 buffer.The fluorescence enhancement of R2 towards Hg2+ maintains stable in wide pH span(6.4-8.8) aqueous solutions.展开更多
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 flu...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).展开更多
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...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 titration experiments.展开更多
The synthesis of two linear terpy-based metallo-supramolecular fluorescent coordination polymers through 1 : 1 complexation of Zn^2+ and Cd^2+ ions with ditopic terpyridine ligand was reported. The dispersibility o...The synthesis of two linear terpy-based metallo-supramolecular fluorescent coordination polymers through 1 : 1 complexation of Zn^2+ and Cd^2+ ions with ditopic terpyridine ligand was reported. The dispersibility of P1 and P2 was significantly improved in organic solvent and water through the introduction of hydrophilic oligo-ethyoxy side chain. Two polymers displayed yellow light emission both in solution and the solid state due to the intra-ligand charge transfer (ILCT) between the d^10 metal ions and the conjugated spacer unit. These coordination polymers were explored as fluorescent chemosensors for detecting picric acid in aqueous media, displaying high sensitivity and good selectivity. In addition, test strips were prepared from these polymers and exhibited the practical potential of detecting the NACs pollutants in the outdoor water for public safety and security.展开更多
The naphthalimide derivative. NA1 was synthesized, which consists of a bis(2-(ethylthio)ethyl)amine group binding cations and naphthalimide unit as chromogenic and fluorogenic signaling subunit. Absorption and emi...The naphthalimide derivative. NA1 was synthesized, which consists of a bis(2-(ethylthio)ethyl)amine group binding cations and naphthalimide unit as chromogenic and fluorogenic signaling subunit. Absorption and emission spectra and the effect of polarity of solvents and pH values were studied. The photo-induced electron transfer (PET) occurred from the donor of bis(2-(ethylthio)ethyl)amine group to the naphthalimide fluorophore. The present study demonstrates that NA1 is a viable candidate as a fluorescent receptor for a new Ag^+ ion sensor. This silver ion chemosensor can discriminate Ag^+ ion well among heavy metal ions by an enhancement of the fluorescence intensity in ethanol-water (1 : 9, V : V). And NA1 is also a pH-sensor because the fluorescence of the compound varies with the pH values.展开更多
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, t...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.展开更多
An efficient fluorescent probe 1 based on tricarbocyanine derivative was designed and synthesized,which can detect Ag^(+) in real industrial wastewater.UV-V is absorption and fluorescent emission spectra of probe 1 we...An efficient fluorescent probe 1 based on tricarbocyanine derivative was designed and synthesized,which can detect Ag^(+) in real industrial wastewater.UV-V is absorption and fluorescent emission spectra of probe 1 were carried out and indicated this probe can bind Ag^(+) via complexation reaction,then leading to a remarkable color change from blue to light red.Furthermore,probe 1 showed high sensitive performance and excellent selectivity toward Ag^(+) over other common metal ions in neutral pH.The sensing mechanism was proposed and further confirmed by ^(1)H NMR,which demonstrate analyte-induced destruction of the π-electron system could be shorten by the disruption of the pull-push π-conjugation system in probe 1.Moreover,a test strip was prepared by filter paper immersing in probe 1 solution,which further provide its potential application for trace Ag^(+) detection in real industrial wastewater.展开更多
A novel fluorescence chemosensor 1 based on (R)-binaphthyl-salen can exhibit highly sensitive and selective recognition responses toward Cu^2+ by "turn-off" fluorescence quench type in THF/H20, and Zn^2+ by "tu...A novel fluorescence chemosensor 1 based on (R)-binaphthyl-salen can exhibit highly sensitive and selective recognition responses toward Cu^2+ by "turn-off" fluorescence quench type in THF/H20, and Zn^2+ by "turn-on" fluorescence enhancement type in CHC13/CH3CN, respectively, suggesting that solvents can dramatically affect the responsive properties of salen-based chemosensor. In addition, Cu^2+ can lead to the most pronounced changes of CD spectra without the influence of solvents, which indicates this kind chemosensor can also be used as a sole Cu^2+ probe based on CD spectra.展开更多
In recent twenty years,aggregation-induced emission(AIE),due to its excellent application prospect,has aroused widespread interests.The development of novel and easy to make AIE luminogens(AIEgens)is an attractive sub...In recent twenty years,aggregation-induced emission(AIE),due to its excellent application prospect,has aroused widespread interests.The development of novel and easy to make AIE luminogens(AIEgens)is an attractive subject.For this purpose,it is very important to study the structure-property relationship of AIEgens.Because azine derivatives are easy to synthesis and some of them have nice AIE properties,herein,a series of azine derivatives(ADs)were employed as models to study the influence of different functional groups,electronic effects and structures on the AIE properties of azine derivatives.The AIE mechanism were studied by single crystal analysis,density functional theory(DFT)calculations and so on.The results indicated that the o-hydroxyl aryl substituted azine compounds could show good AIE properties.Meanwhile,the AIE properties of o-hydroxyl aryl substituted azine compounds were also influenced by the electronic effects of the aryl groups in the azine compounds.The o-hydroxyl groups could form intramolecular hydrogen bond with imine group,which play key role to restrict the intramolecular rotation of the aryl groups and act as base stone for the AIE process of this kind compounds.The HOMO-LUMO energy gaps of o-hydroxyl substituted azine are smaller than other homologous compounds,which is agree with the proposed AIE mechanism.Finally,thanks to the AIE properties,the o-hydroxy-substituted azines could be used as efficient Al^(3+)and Cu^(2+)fluorescent chemosensors in different conditions.In addition,test strips based on AD10 has been prepared,which can conveniently detect Cu^(2+)in industrial wastewater.This research supplied a way for the design of novel easy to make AIEgens through simple azine derivatives.展开更多
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 ac...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.展开更多
文摘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 Mn<sup>2+</sup> was determined to be 1:1 by the Benesi-Hildebrand method.
基金Supported by the National Natural Science Foundation of China(No.21172178).
文摘Based on Rhodamine,two novel fluorescent Hg2+ chemosensors(R1,R2) were synthesized from inexpensive starting materials.They 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 made.The chemosensors were designed with a photoinduced electron transfer(PET) mechanism.After binding to Hg2+ which blocks the PET process,the fluorescence intensity of the chemosensors was enhanced by up to 15-fold.They 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 buffer.The fluorescence enhancement of R2 towards Hg2+ maintains stable in wide pH span(6.4-8.8) aqueous solutions.
基金Supported by the National Natural Science Foundation of China(No.21306133) and the Tianjin Research Program of Appli- cation Foundation and Advanced Technology, China(No. 14JCYBJC22600).
文摘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).
基金the National Natural Science Foundation of China(No.20502008)the State Science Foundation of China(No.05300152)the Science Foundation of Tianjin Medical University(No.2006x9d2) for financial support
文摘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 titration experiments.
文摘The synthesis of two linear terpy-based metallo-supramolecular fluorescent coordination polymers through 1 : 1 complexation of Zn^2+ and Cd^2+ ions with ditopic terpyridine ligand was reported. The dispersibility of P1 and P2 was significantly improved in organic solvent and water through the introduction of hydrophilic oligo-ethyoxy side chain. Two polymers displayed yellow light emission both in solution and the solid state due to the intra-ligand charge transfer (ILCT) between the d^10 metal ions and the conjugated spacer unit. These coordination polymers were explored as fluorescent chemosensors for detecting picric acid in aqueous media, displaying high sensitivity and good selectivity. In addition, test strips were prepared from these polymers and exhibited the practical potential of detecting the NACs pollutants in the outdoor water for public safety and security.
基金Project supported by the National Natural Science Foundation of China (No. 90401026) and the Foundation of Scientific Committee of Shanghai.
文摘The naphthalimide derivative. NA1 was synthesized, which consists of a bis(2-(ethylthio)ethyl)amine group binding cations and naphthalimide unit as chromogenic and fluorogenic signaling subunit. Absorption and emission spectra and the effect of polarity of solvents and pH values were studied. The photo-induced electron transfer (PET) occurred from the donor of bis(2-(ethylthio)ethyl)amine group to the naphthalimide fluorophore. The present study demonstrates that NA1 is a viable candidate as a fluorescent receptor for a new Ag^+ ion sensor. This silver ion chemosensor can discriminate Ag^+ ion well among heavy metal ions by an enhancement of the fluorescence intensity in ethanol-water (1 : 9, V : V). And NA1 is also a pH-sensor because the fluorescence of the compound varies with the pH values.
基金Supported by the Natural Science Foundation of Shanxi Province, China(No.2013011040-6), the Project Sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, the Ministry of Education of China.
文摘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.
基金financially supported by National Natural Science Foundation of China(21808028)Science and Technology Foundation of Liaoning Province(2019-BS-047)the Fundamental Research Funds for the Central Universities(2018011013).
文摘An efficient fluorescent probe 1 based on tricarbocyanine derivative was designed and synthesized,which can detect Ag^(+) in real industrial wastewater.UV-V is absorption and fluorescent emission spectra of probe 1 were carried out and indicated this probe can bind Ag^(+) via complexation reaction,then leading to a remarkable color change from blue to light red.Furthermore,probe 1 showed high sensitive performance and excellent selectivity toward Ag^(+) over other common metal ions in neutral pH.The sensing mechanism was proposed and further confirmed by ^(1)H NMR,which demonstrate analyte-induced destruction of the π-electron system could be shorten by the disruption of the pull-push π-conjugation system in probe 1.Moreover,a test strip was prepared by filter paper immersing in probe 1 solution,which further provide its potential application for trace Ag^(+) detection in real industrial wastewater.
基金the National Natural Science Foundation of China,National Basic Research Program of China,Zhejiang Provincial Natural Science Foundation,the Bureau of Science and Technology of Wenzhou
文摘A novel fluorescence chemosensor 1 based on (R)-binaphthyl-salen can exhibit highly sensitive and selective recognition responses toward Cu^2+ by "turn-off" fluorescence quench type in THF/H20, and Zn^2+ by "turn-on" fluorescence enhancement type in CHC13/CH3CN, respectively, suggesting that solvents can dramatically affect the responsive properties of salen-based chemosensor. In addition, Cu^2+ can lead to the most pronounced changes of CD spectra without the influence of solvents, which indicates this kind chemosensor can also be used as a sole Cu^2+ probe based on CD spectra.
基金supported by the National Natural Science Foundation of China(NSFC,No.22065031)the Key R&D Program of Gansu Province(No.21YF5GA066)+4 种基金Gansu Province College Industry Support Plan Project(No.2022CYZC-18)Natural Science Foundation of Gansu Province(Nos.2020-0405-JCC-630,20JR10RA088)Fundamental Research Funds for the Central Universities(Nos.31920190041,31920200002,31920190018,31920190013)Young Doctor Foundation of Gansu Province(No.2021QB-148)The Science and Technology Project Funded by Social Capital in Longnan City of Gansu Province(No.2021-SZ-01)。
文摘In recent twenty years,aggregation-induced emission(AIE),due to its excellent application prospect,has aroused widespread interests.The development of novel and easy to make AIE luminogens(AIEgens)is an attractive subject.For this purpose,it is very important to study the structure-property relationship of AIEgens.Because azine derivatives are easy to synthesis and some of them have nice AIE properties,herein,a series of azine derivatives(ADs)were employed as models to study the influence of different functional groups,electronic effects and structures on the AIE properties of azine derivatives.The AIE mechanism were studied by single crystal analysis,density functional theory(DFT)calculations and so on.The results indicated that the o-hydroxyl aryl substituted azine compounds could show good AIE properties.Meanwhile,the AIE properties of o-hydroxyl aryl substituted azine compounds were also influenced by the electronic effects of the aryl groups in the azine compounds.The o-hydroxyl groups could form intramolecular hydrogen bond with imine group,which play key role to restrict the intramolecular rotation of the aryl groups and act as base stone for the AIE process of this kind compounds.The HOMO-LUMO energy gaps of o-hydroxyl substituted azine are smaller than other homologous compounds,which is agree with the proposed AIE mechanism.Finally,thanks to the AIE properties,the o-hydroxy-substituted azines could be used as efficient Al^(3+)and Cu^(2+)fluorescent chemosensors in different conditions.In addition,test strips based on AD10 has been prepared,which can conveniently detect Cu^(2+)in industrial wastewater.This research supplied a way for the design of novel easy to make AIEgens through simple azine derivatives.
基金We thank the metallurgical research foundation in University of Science and Technology of Beijing the National Natural Science Foundation of China (No. 20972015) and the Natural Science Foundation of Bei-jing (No. 2112026) for financial support.
文摘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.