A new fluorescent ＂on-off＇ chemosensor for Hg2＋ initiated by a derivative of rhodamine B was designed and synthesized. Compound 1 exhibited high sensitivity and selectivity for Hg2＋ over other commonly coexistent ...A new fluorescent ＂on-off＇ chemosensor for Hg2＋ initiated by a derivative of rhodamine B was designed and synthesized. Compound 1 exhibited high sensitivity and selectivity for Hg2＋ over other commonly coexistent metal ions in aqueous media, Upon the addition of Hg2＋, the spirocyclic ring of probe is opened and a significant enhancement of visible color and fluorescence in the range of 500-600 nm is observed, The colorimetric and fluorescent response to Hg2＋ can be conveniently detected by the naked eye, which provides a facile method for visual detection of Hg2＋, From the molecular structure and spectral results of 1, an irreversible, hydrolysis, desulfurization reaction mechanism is proposed.展开更多
A quinoline derivative N-（2-hydroxyl-naphthylmethyl）-N-（quinol-8-yl）amine（2） was synthesized and characterized, which can selectively recognize Cu^2＋ over other metal ions such as Zn^2＋, Cd^2＋, Sn^2＋, Pb^2＋...A quinoline derivative N-（2-hydroxyl-naphthylmethyl）-N-（quinol-8-yl）amine（2） was synthesized and characterized, which can selectively recognize Cu^2＋ over other metal ions such as Zn^2＋, Cd^2＋, Sn^2＋, Pb^2＋, Hg^2＋, Ni^2＋, Mg^2＋, Cr^3＋, Mn^2＋, Sr^2＋, K^＋, Ca^2＋, Na^＋, Ba^2＋ in acetonitrile/water（volume ratio 99：1）. Cu^2＋ induced a new absorption peak at 464 nm in the absorption spectrum（ε=4.66×10^2 L·mol^-1·cm^-1） and quenched the fluorescence emission of quinoline derivative 2. The binding of quinoline derivative 2 to Cu^2＋ was in 1 ： 1 model and stable constant was esti- mated to be 2.48×10^5 L·mol^-1.展开更多
A new conjugated hyperbranched polymer （hb-TFO） containing tetraphenylethylene （TPE） units, a famous aggregation-induced emission （AIE） active group, as the core, was synthesized successfully with modest yield v...A new conjugated hyperbranched polymer （hb-TFO） containing tetraphenylethylene （TPE） units, a famous aggregation-induced emission （AIE） active group, as the core, was synthesized successfully with modest yield via one-pot Suzuki polymerization reaction. Thanks to the introduction of TPE moieties, hb-TFO exhibited aggregation-enhanced emission （AEE） property, and could work as explosive chemosensor with high sensitivity. The polymeric light-emitting diode （PLED） device was fabricated to investigate its electroluminescent property, and hb-TFO demonstrated a maximum luminance efficiency of 0.22 cd/A and a maximum brightness of 545 cd/m2 at 15.9 V.展开更多
A novel chemosensor 1 （CS1） bearing one coumarin and two carbodithioate groups was synthesized and its fluorescent sensing behavior toward metal ions was investigated. Ag^＋ addition to a CH3COCH3/H2O （3：7, v：v）...A novel chemosensor 1 （CS1） bearing one coumarin and two carbodithioate groups was synthesized and its fluorescent sensing behavior toward metal ions was investigated. Ag^＋ addition to a CH3COCH3/H2O （3：7, v：v） solution of CS1 gave a significantly quenched fluorescence. Other ions including Pb^2＋, Zn^2＋, Cu^2＋, Ca^2＋, Cd^2＋, Co^2＋, Mg^2＋, Mn^2＋, Hg^2＋, Ag^＋, Ni^2＋ induced no or much smaller spectral changes. This constitutes an ON-OFF Ag^＋-selective fluorescent chemosensor.展开更多
A pyridoxal-based chemosensor was synthesized by reacting hydrazine hydrate and pyridoxal hydrochloride in ethanol and characterized by NMR and ESI-MS. The optical properties of the compound were investigated in a met...A pyridoxal-based chemosensor was synthesized by reacting hydrazine hydrate and pyridoxal hydrochloride in ethanol and characterized by NMR and ESI-MS. The optical properties of the compound were investigated in a methanol： HEPES solution. The compound displayed selectivity for Cu2＋, as evidenced by a colorless to yellow color change, which was characterized using UV-vis spectroscopy. The fluorescence of the compound can be quenched only by Cu2＋, accompanying by a color change from blue to colorless. Furthermore, it can be used in bioimaging.展开更多
The phosphorus-containing PODIPY 1 as a chemosensor can detect Hg^2＋ by a color change from pink to violet red without the use of any instrumentation. PODIPY 1 was selective to Hg^2＋ with a remarkable absorption cha...The phosphorus-containing PODIPY 1 as a chemosensor can detect Hg^2＋ by a color change from pink to violet red without the use of any instrumentation. PODIPY 1 was selective to Hg^2＋ with a remarkable absorption change, and addition of other relevant metal ions caused almost no absorption change. The new PODIPY dye 1 was sensitive to various concentrations of Hg^2＋. The energy gap between the HOMO and LUMO of the metal complex 1–Hg^2＋ is smaller than that of chemosensor 1, which is in good agreement with the red shift in the absorption observed upon treatment of 1 with Hg^2＋. The 1-based test strips were easily fabricated and low-cost, useful in practical and efficient Hg^2＋test kits.展开更多
A novel and simple cyanide chemosensor 2-（naphthalen-1-ylmethylene）malononitrile（L） was designed and synthesized via a green chemistry method in water without using any catalyst.The chemosensor showed an excellent...A novel and simple cyanide chemosensor 2-（naphthalen-1-ylmethylene）malononitrile（L） was designed and synthesized via a green chemistry method in water without using any catalyst.The chemosensor showed an excellent sensitivity and selectivity for CN in aqueous solution.The detection limit could be as low as 1.6×10~7 moI/L（0.16μmol/L）,which is far lower than the WHO guideline of 1.9μmol/L cyanide for drink water.展开更多
A new pyrene derivative BF bearing a furan group was synthesized via a one-step reaction as a colorimetric and ratiometric chemosensor for Al3＋ in ethanol-H20 （9：1, v/v, pH 7.2, HEPES buffer） solution. This chemos...A new pyrene derivative BF bearing a furan group was synthesized via a one-step reaction as a colorimetric and ratiometric chemosensor for Al3＋ in ethanol-H20 （9：1, v/v, pH 7.2, HEPES buffer） solution. This chemosensor could selectively recognize Al3＋ in the presence of other competing ions. Low limit of detection （LOD） and high association constant revealed its superior sensitivity and binding affinity toward Al3＋, Besides, the probe BF performed perfectly in a reversibility test using EDTA. The mechanism of the interaction has been confirmed by 1H NMR titration. Importantly, chemosensor BF has also been utilized to detect Al3＋ on test paper strips, which showed its ootential for practical applications.展开更多
A new selective Zn^2＋ fluorescent chemosensor, o-vanillin-4-ethoxybenzoylhydrazone （1）, was designed and prepared. Free 1 mainly displayed very weak fluorescence at 480 nm upon excitation at 403 nm. It displayed hi...A new selective Zn^2＋ fluorescent chemosensor, o-vanillin-4-ethoxybenzoylhydrazone （1）, was designed and prepared. Free 1 mainly displayed very weak fluorescence at 480 nm upon excitation at 403 nm. It displayed high selectivity for Zn^2＋ and had a 518- fold fluorescent enhancement upon binding of Zn^2＋, while the other cation ions had only little influence on the fluorescence of 1. Mechanism of enhancement of l＇s fluorescence by Zn^2＋ was briefly discussed.展开更多
A simple ＂off-on＂ fluorescent chemosensor with high selectivity to zinc ions based on 1,10-phenanthro-line receptor dipyrido[3,2-d：2＇,3＇-f]quinoxaline（L） was investigated.The selectivity response of receptor L ...A simple ＂off-on＂ fluorescent chemosensor with high selectivity to zinc ions based on 1,10-phenanthro-line receptor dipyrido[3,2-d：2＇,3＇-f]quinoxaline（L） was investigated.The selectivity response of receptor L to zinc ion was demonstrated by UV-Vis absorption and fluorescence spectroscopies in DMF buffer solution.The experiment results show that the fluorescent chemosensor L exhibits the optimum response behavior to Zn2＋ in the range of pH 8.0―9.0 and shows excellent selectivity to Zn2＋ over other cations tested.展开更多
A novel fluorescence enhancement Cu^2＋ chemosensor derived from coumarin was prepared. Emission study found that it exhibits evident Cu^2＋-arnplified fluorescence prior to Co^2＋, Pb^2＋, Mg^2＋, Mn^2＋, Ni^2＋, Zn^...A novel fluorescence enhancement Cu^2＋ chemosensor derived from coumarin was prepared. Emission study found that it exhibits evident Cu^2＋-arnplified fluorescence prior to Co^2＋, Pb^2＋, Mg^2＋, Mn^2＋, Ni^2＋, Zn^2＋, Fe^3＋, Ag^＋ and Cd^2＋, and the largest emission enhancement factor is about 9 at a ratio of 2：1 （chemosensor 1/Cu^2＋）.展开更多
A new europium complex is descried as a time-resolved luminescence-based sensor for fluoride anion. The sensor is selective even in the presence of intensive background fluorescence.
A conjugated 8-hydroxyquinoline( 8-HQ)-based fluorescent chemosensor( 1) for Zinc ion( Zn^(2+)) and Cadmium ion( Cd^(2+)) was developed in aqueous solution and used for Zinc ion living cells bioimaging. The probe 1 wa...A conjugated 8-hydroxyquinoline( 8-HQ)-based fluorescent chemosensor( 1) for Zinc ion( Zn^(2+)) and Cadmium ion( Cd^(2+)) was developed in aqueous solution and used for Zinc ion living cells bioimaging. The probe 1 was weakly fluorescent,but displayed a strong fluorescence at 580 nm with a large Stokes shift of150 nm in the presence of Zn^(2+) or Cd^(2+). This probe allows the detections of Zn^(2+) in the range of 0. 8-10 μmol/L and Cd^(2+) in the range of 0. 8-8 μmol/L,with the limit of detections of 0. 2 and 0. 6μmol/L for Zn^(2+) and Cd^(2+),respectively. The present probe was successfully used for fluorescence bioimaging of Zn^(2+) or Cd^(2+) in the living cells.展开更多
In this research,specific molecular sensors are classified according to the type of receptor-cation interaction,that is ligand-metal interactions.Receptors are based on a multidentate protoporphyrin-appended pyridine ...In this research,specific molecular sensors are classified according to the type of receptor-cation interaction,that is ligand-metal interactions.Receptors are based on a multidentate protoporphyrin-appended pyridine platform,which leaves at least a vacant coordination site for the incoming metal ions.A protoporphyrin-appended pyridine,2,5-pyridine dicarboxyamidyl-8,13-bis(vinyl)-3,7,18,17-tetramethyl-21 H,23 H-porphyrin(P-PTP),was designed and synthesized.Its application as potential fluoroionophore for recognition of cadmium and mercury ions is reported.P-PTP shows chelation-enhanced fluorescence effect with Cd(Ⅱ)and Hg(Ⅱ)via the interruption of photoinduced electron transfer(PET)process,which has been utilized as the basis of the fabrication of the metal ions-sensitive fluorescent chemosensor.The analytical performance characteristics of the proposed Cd(Ⅱ)-and Hg(Ⅱ)-sensitive chemosensors were investigated.It shows a linear response toward Cd(Ⅱ)and Hg(Ⅱ)in the concentration range of 1.0×10-3 to 1.0×10-7 M with a limit of detection of 1.0×10-7 M and 0.5×10-7M for Cd(Ⅱ)and Hg(Ⅱ),respectively.The chemosensor shows good selectivity for Cd(Ⅱ)over a large number of other transition metal ions,i.e.,Cu(Ⅱ),Zn(Ⅱ)and mixed metal ions.展开更多
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
A new tripodal rhodamine B derivative 2 was designed and synthesized by tripodal trialdehyde and rhodamine B hydrazide for the first time. This derivative could be used as a fluorescent chemosensor for the selective a...A new tripodal rhodamine B derivative 2 was designed and synthesized by tripodal trialdehyde and rhodamine B hydrazide for the first time. This derivative could be used as a fluorescent chemosensor for the selective and sensitive determination of copper(II) in Tris-HCl buffer and ethanol aqueous mixed media. Under the optimum conditions described herein,fluorescence enhancement at 557/577 nm was linearly related to the concentration of copper(II) in the range of 0.10 to 10.00×10-5 mol·L-1,with a corre-lation coefficient of R2=0.9964 (n=15) and a detection limit of 1.129×10-7 mol·L-1 (the relative standard deviation for five repeated measurements at 4.00×10-5 mol·L-1 Cu(II) was 2.2%). The absorbance meas-urements at 557 nm were linearly related to the concentration of Cu(II) in the range of 0.50 to 25.00×10-5 mol·L-1,with a correlation coefficient of R2=0.9948 (n=13) and a detection limit of 3.338×10-7mol·L-1.展开更多
A fluorescence turn-on chemosensor based on rhodamine B derivative (FD10) has been developed as a highly sensitive chemosensor for Hg2+. A prominent fluorescence enhancement was measured in the presence of Hg2+, which...A fluorescence turn-on chemosensor based on rhodamine B derivative (FD10) has been developed as a highly sensitive chemosensor for Hg2+. A prominent fluorescence enhancement was measured in the presence of Hg2+, which was in agreement with the changes in the absorption spectrum. Furthermore, by means of laser scanning fluorescence microscopy experiments, it was demonstrated that FD10 was cell-permeable and could be used as a fluorescent probe for monitoring Hg2+ in living cells.展开更多
We synthesized a new cyanide （CN-） chemosensor CX based on a nucleophilic addition reaction prompted by cyanide ion, which could be used for highly selective and sensitive fluorescence turn-on detection of cyanide i...We synthesized a new cyanide （CN-） chemosensor CX based on a nucleophilic addition reaction prompted by cyanide ion, which could be used for highly selective and sensitive fluorescence turn-on detection of cyanide in aqueous media. The CX showed selective fluorescence recognition for CN-, the miscellaneous competitive anions （F-, Cl-, Br-, I-, AcO-, H2PO4, HSO4, ClO4, S2-, PO4^3-, CO3^2- and SCN- ） did not lead to any significant interference. The detection limit of the sensor towards CN is 1.15 × 10^-7 mol.L- 1. The sensor has been successfully applied to estimate the cyanide ion in seeds of cherries. Test strips based on CX were fabricated, which could be used as a convenient and efficient CN test kit to detect CN in aqueous solution for ＂in-the-field＂ measurement.展开更多
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 multian...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.展开更多
Sodium diethyldithiocarbamate (DDTC-Na) was demonstrated to be a new colorimetric cyanide chemosensor by utilizing an indirect trick. First, some copper ions were added to the colorless aque- ous solution of DDTC-Na. ...Sodium diethyldithiocarbamate (DDTC-Na) was demonstrated to be a new colorimetric cyanide chemosensor by utilizing an indirect trick. First, some copper ions were added to the colorless aque- ous solution of DDTC-Na. Then, the resultant brown solution was studied upon the addition of different anions, including Cl-, I-, IO3-, SO42-, NO-2, Br-, H2PO4-, F-, SCN-, HSO-4, ClO-4 and CN-. It was observed by naked eyes that the brown solution changed to colorless immediately after the addition of the trace cyanide, but there were no changes towards other anions, making DDTC-Na a good selective cyanide chemosensor in pure water.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.20972143,21375113)Program for New Century Excellent Talents in University(No.NCET-11-0950)
文摘A new fluorescent ＂on-off＇ chemosensor for Hg2＋ initiated by a derivative of rhodamine B was designed and synthesized. Compound 1 exhibited high sensitivity and selectivity for Hg2＋ over other commonly coexistent metal ions in aqueous media, Upon the addition of Hg2＋, the spirocyclic ring of probe is opened and a significant enhancement of visible color and fluorescence in the range of 500-600 nm is observed, The colorimetric and fluorescent response to Hg2＋ can be conveniently detected by the naked eye, which provides a facile method for visual detection of Hg2＋, From the molecular structure and spectral results of 1, an irreversible, hydrolysis, desulfurization reaction mechanism is proposed.
基金Supported by the Natural Science Foundation of Beijing City,China(No.2082016)
文摘A quinoline derivative N-（2-hydroxyl-naphthylmethyl）-N-（quinol-8-yl）amine（2） was synthesized and characterized, which can selectively recognize Cu^2＋ over other metal ions such as Zn^2＋, Cd^2＋, Sn^2＋, Pb^2＋, Hg^2＋, Ni^2＋, Mg^2＋, Cr^3＋, Mn^2＋, Sr^2＋, K^＋, Ca^2＋, Na^＋, Ba^2＋ in acetonitrile/water（volume ratio 99：1）. Cu^2＋ induced a new absorption peak at 464 nm in the absorption spectrum（ε=4.66×10^2 L·mol^-1·cm^-1） and quenched the fluorescence emission of quinoline derivative 2. The binding of quinoline derivative 2 to Cu^2＋ was in 1 ： 1 model and stable constant was esti- mated to be 2.48×10^5 L·mol^-1.
文摘A new conjugated hyperbranched polymer （hb-TFO） containing tetraphenylethylene （TPE） units, a famous aggregation-induced emission （AIE） active group, as the core, was synthesized successfully with modest yield via one-pot Suzuki polymerization reaction. Thanks to the introduction of TPE moieties, hb-TFO exhibited aggregation-enhanced emission （AEE） property, and could work as explosive chemosensor with high sensitivity. The polymeric light-emitting diode （PLED） device was fabricated to investigate its electroluminescent property, and hb-TFO demonstrated a maximum luminance efficiency of 0.22 cd/A and a maximum brightness of 545 cd/m2 at 15.9 V.
文摘A novel chemosensor 1 （CS1） bearing one coumarin and two carbodithioate groups was synthesized and its fluorescent sensing behavior toward metal ions was investigated. Ag^＋ addition to a CH3COCH3/H2O （3：7, v：v） solution of CS1 gave a significantly quenched fluorescence. Other ions including Pb^2＋, Zn^2＋, Cu^2＋, Ca^2＋, Cd^2＋, Co^2＋, Mg^2＋, Mn^2＋, Hg^2＋, Ag^＋, Ni^2＋ induced no or much smaller spectral changes. This constitutes an ON-OFF Ag^＋-selective fluorescent chemosensor.
基金supported by the National Natural Science Foundation of China (No.21102086)the Shanxi Province Science Foundation for Youths (Nos.2012021009-4 and 2013011011-1)+4 种基金the Shanxi Province Foundation for Returnee (No.2012-007)the Taiyuan Technology Star Special (No.12024703)the Program for the Top Young and Middle-aged Innovative Talents of Higher Learning Institutions of Shanxi (TYMIT,No.2013802)talents Support Program of Shanxi Province (No.2014401)CAS Key Laboratory of Analytical Chemistry for Living Biosystems Open Foundation (No.ACL201304)
文摘A pyridoxal-based chemosensor was synthesized by reacting hydrazine hydrate and pyridoxal hydrochloride in ethanol and characterized by NMR and ESI-MS. The optical properties of the compound were investigated in a methanol： HEPES solution. The compound displayed selectivity for Cu2＋, as evidenced by a colorless to yellow color change, which was characterized using UV-vis spectroscopy. The fluorescence of the compound can be quenched only by Cu2＋, accompanying by a color change from blue to colorless. Furthermore, it can be used in bioimaging.
基金supported by the Public Research Foundation of Liaoning Province for the Cause of Science (No. 2014003009)Science and Technology Key Project of Liaoning Province (No. 2013304007)+2 种基金the Foundation of the Education Department of Henan Province for Science and Technology Research Projects (No. 13A150046)the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministrythe startup funds from Shenyang University of Chemical Technology
文摘The phosphorus-containing PODIPY 1 as a chemosensor can detect Hg^2＋ by a color change from pink to violet red without the use of any instrumentation. PODIPY 1 was selective to Hg^2＋ with a remarkable absorption change, and addition of other relevant metal ions caused almost no absorption change. The new PODIPY dye 1 was sensitive to various concentrations of Hg^2＋. The energy gap between the HOMO and LUMO of the metal complex 1–Hg^2＋ is smaller than that of chemosensor 1, which is in good agreement with the red shift in the absorption observed upon treatment of 1 with Hg^2＋. The 1-based test strips were easily fabricated and low-cost, useful in practical and efficient Hg^2＋test kits.
基金supported by the National Natural Science Foundation of China(NSFC)(Nos.21064006,21161018, 21262032)the Natural Science Foundation of Gansu Province (No.1010RJZA018)the Program for Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China(No.IRT1177)
文摘A novel and simple cyanide chemosensor 2-（naphthalen-1-ylmethylene）malononitrile（L） was designed and synthesized via a green chemistry method in water without using any catalyst.The chemosensor showed an excellent sensitivity and selectivity for CN in aqueous solution.The detection limit could be as low as 1.6×10~7 moI/L（0.16μmol/L）,which is far lower than the WHO guideline of 1.9μmol/L cyanide for drink water.
基金the financial support from the open fund of the State Key Laboratory of Materials-Oriented Chemical Engineering(No.KL13-07)the Specialized Research Fund for the Doctoral Program of Higher Education(No.20123221110012)+1 种基金the China Postdoctoral Science Foundation(No.2014M550287)the Postgraduate Education and Innovation Project of Jiangsu Province(No.KYLX-0772)
文摘A new pyrene derivative BF bearing a furan group was synthesized via a one-step reaction as a colorimetric and ratiometric chemosensor for Al3＋ in ethanol-H20 （9：1, v/v, pH 7.2, HEPES buffer） solution. This chemosensor could selectively recognize Al3＋ in the presence of other competing ions. Low limit of detection （LOD） and high association constant revealed its superior sensitivity and binding affinity toward Al3＋, Besides, the probe BF performed perfectly in a reversibility test using EDTA. The mechanism of the interaction has been confirmed by 1H NMR titration. Importantly, chemosensor BF has also been utilized to detect Al3＋ on test paper strips, which showed its ootential for practical applications.
基金the Nature Science Foundation of China(No.20371016)the Education Committee of Henan Province(No.2007150027).
文摘A new selective Zn^2＋ fluorescent chemosensor, o-vanillin-4-ethoxybenzoylhydrazone （1）, was designed and prepared. Free 1 mainly displayed very weak fluorescence at 480 nm upon excitation at 403 nm. It displayed high selectivity for Zn^2＋ and had a 518- fold fluorescent enhancement upon binding of Zn^2＋, while the other cation ions had only little influence on the fluorescence of 1. Mechanism of enhancement of l＇s fluorescence by Zn^2＋ was briefly discussed.
基金Supported by the Talent-supporting Program Foundation of Liaoning Province,China(No.2009R03)the Science Foundation of Education Office of Liaoning Province,China(No.2009A028)
文摘A simple ＂off-on＂ fluorescent chemosensor with high selectivity to zinc ions based on 1,10-phenanthro-line receptor dipyrido[3,2-d：2＇,3＇-f]quinoxaline（L） was investigated.The selectivity response of receptor L to zinc ion was demonstrated by UV-Vis absorption and fluorescence spectroscopies in DMF buffer solution.The experiment results show that the fluorescent chemosensor L exhibits the optimum response behavior to Zn2＋ in the range of pH 8.0―9.0 and shows excellent selectivity to Zn2＋ over other cations tested.
文摘A novel fluorescence enhancement Cu^2＋ chemosensor derived from coumarin was prepared. Emission study found that it exhibits evident Cu^2＋-arnplified fluorescence prior to Co^2＋, Pb^2＋, Mg^2＋, Mn^2＋, Ni^2＋, Zn^2＋, Fe^3＋, Ag^＋ and Cd^2＋, and the largest emission enhancement factor is about 9 at a ratio of 2：1 （chemosensor 1/Cu^2＋）.
基金the National Natural Science Foundation of China(20490210)Shanghai Sci.Tech.Comm.(03QB14006,03DZ12031 and 05DJ14004)for financial support.
文摘A new europium complex is descried as a time-resolved luminescence-based sensor for fluoride anion. The sensor is selective even in the presence of intensive background fluorescence.
基金Shanghai Municipal Natural Science Foundation,China(No.16ZR1401700)
文摘A conjugated 8-hydroxyquinoline( 8-HQ)-based fluorescent chemosensor( 1) for Zinc ion( Zn^(2+)) and Cadmium ion( Cd^(2+)) was developed in aqueous solution and used for Zinc ion living cells bioimaging. The probe 1 was weakly fluorescent,but displayed a strong fluorescence at 580 nm with a large Stokes shift of150 nm in the presence of Zn^(2+) or Cd^(2+). This probe allows the detections of Zn^(2+) in the range of 0. 8-10 μmol/L and Cd^(2+) in the range of 0. 8-8 μmol/L,with the limit of detections of 0. 2 and 0. 6μmol/L for Zn^(2+) and Cd^(2+),respectively. The present probe was successfully used for fluorescence bioimaging of Zn^(2+) or Cd^(2+) in the living cells.
文摘In this research,specific molecular sensors are classified according to the type of receptor-cation interaction,that is ligand-metal interactions.Receptors are based on a multidentate protoporphyrin-appended pyridine platform,which leaves at least a vacant coordination site for the incoming metal ions.A protoporphyrin-appended pyridine,2,5-pyridine dicarboxyamidyl-8,13-bis(vinyl)-3,7,18,17-tetramethyl-21 H,23 H-porphyrin(P-PTP),was designed and synthesized.Its application as potential fluoroionophore for recognition of cadmium and mercury ions is reported.P-PTP shows chelation-enhanced fluorescence effect with Cd(Ⅱ)and Hg(Ⅱ)via the interruption of photoinduced electron transfer(PET)process,which has been utilized as the basis of the fabrication of the metal ions-sensitive fluorescent chemosensor.The analytical performance characteristics of the proposed Cd(Ⅱ)-and Hg(Ⅱ)-sensitive chemosensors were investigated.It shows a linear response toward Cd(Ⅱ)and Hg(Ⅱ)in the concentration range of 1.0×10-3 to 1.0×10-7 M with a limit of detection of 1.0×10-7 M and 0.5×10-7M for Cd(Ⅱ)and Hg(Ⅱ),respectively.The chemosensor shows good selectivity for Cd(Ⅱ)over a large number of other transition metal ions,i.e.,Cu(Ⅱ),Zn(Ⅱ)and mixed metal ions.
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 Foundation of the Governor of Guizhou Province, China (Grant No. 200617)the Talented Person Foundation of Guizhou University (Grant No. 2007039)
文摘A new tripodal rhodamine B derivative 2 was designed and synthesized by tripodal trialdehyde and rhodamine B hydrazide for the first time. This derivative could be used as a fluorescent chemosensor for the selective and sensitive determination of copper(II) in Tris-HCl buffer and ethanol aqueous mixed media. Under the optimum conditions described herein,fluorescence enhancement at 557/577 nm was linearly related to the concentration of copper(II) in the range of 0.10 to 10.00×10-5 mol·L-1,with a corre-lation coefficient of R2=0.9964 (n=15) and a detection limit of 1.129×10-7 mol·L-1 (the relative standard deviation for five repeated measurements at 4.00×10-5 mol·L-1 Cu(II) was 2.2%). The absorbance meas-urements at 557 nm were linearly related to the concentration of Cu(II) in the range of 0.50 to 25.00×10-5 mol·L-1,with a correlation coefficient of R2=0.9948 (n=13) and a detection limit of 3.338×10-7mol·L-1.
基金Supported by the National Natural Science Foundation of China (Grant No. 20801015)Shanghai Leading Academic Discipline Project (Grant No. B108)
文摘A fluorescence turn-on chemosensor based on rhodamine B derivative (FD10) has been developed as a highly sensitive chemosensor for Hg2+. A prominent fluorescence enhancement was measured in the presence of Hg2+, which was in agreement with the changes in the absorption spectrum. Furthermore, by means of laser scanning fluorescence microscopy experiments, it was demonstrated that FD10 was cell-permeable and could be used as a fluorescent probe for monitoring Hg2+ in living cells.
基金This work was supported by the National Natural Science Foundation of China （Nos. 21161018, 21262032, 21574104）, the Program for Chang Jiang Scholars and Innovative Research Team in University of Ministry of Education of China （No. IRTI177）.
文摘We synthesized a new cyanide （CN-） chemosensor CX based on a nucleophilic addition reaction prompted by cyanide ion, which could be used for highly selective and sensitive fluorescence turn-on detection of cyanide in aqueous media. The CX showed selective fluorescence recognition for CN-, the miscellaneous competitive anions （F-, Cl-, Br-, I-, AcO-, H2PO4, HSO4, ClO4, S2-, PO4^3-, CO3^2- and SCN- ） did not lead to any significant interference. The detection limit of the sensor towards CN is 1.15 × 10^-7 mol.L- 1. The sensor has been successfully applied to estimate the cyanide ion in seeds of cherries. Test strips based on CX were fabricated, which could be used as a convenient and efficient CN test kit to detect CN in aqueous solution for ＂in-the-field＂ measurement.
文摘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.
基金Supported by the National Natural Science Foundation of China (Grant Nos. 20674059 & 20402011)
文摘Sodium diethyldithiocarbamate (DDTC-Na) was demonstrated to be a new colorimetric cyanide chemosensor by utilizing an indirect trick. First, some copper ions were added to the colorless aque- ous solution of DDTC-Na. Then, the resultant brown solution was studied upon the addition of different anions, including Cl-, I-, IO3-, SO42-, NO-2, Br-, H2PO4-, F-, SCN-, HSO-4, ClO-4 and CN-. It was observed by naked eyes that the brown solution changed to colorless immediately after the addition of the trace cyanide, but there were no changes towards other anions, making DDTC-Na a good selective cyanide chemosensor in pure water.
