Fluorescence quenching effect of metal ions for a,a?-diamine containing conjugated polymers in solid films

2004 ◽  
Vol 49 (3) ◽  
pp. 246
Author(s):  
Leilei TIAN
Keyword(s):  
Fluorescence Quenching ◽  
Metal Ions ◽  
Conjugated Polymers ◽  
Quenching Effect ◽  
Solid Films

Fluorescence quenching effect of metal ions for α,α′-diamine containing conjugated polymers in solid films

2004 ◽  
Vol 49 (3) ◽  
pp. 246-248
Author(s):  
Leilei Tian ◽  
Ming Zhang ◽  
Ping Lu ◽  
Wu Zhang ◽  
Bing Yang ◽  
...  
Keyword(s):  
Fluorescence Quenching ◽  
Metal Ions ◽  
Conjugated Polymers ◽  
Quenching Effect ◽  
Solid Films

Selective fluorescence sensing ofp-nitroaniline and Fe3+ions by luminescent Eu-based metal-organic framework

Sensor Review ◽  
2019 ◽  
Vol 39 (2) ◽  
pp. 149-161 ◽  
Author(s):  
Yanyan Pu ◽  
Zongchao Yu ◽  
Fengqin Wang ◽  
Yiyuan Fu ◽  
Tao Yan ◽  
...  
Keyword(s):  
Fluorescence Quenching ◽  
Metal Ions ◽  
Photoelectron Spectroscopy ◽  
Fluorescence Sensing ◽  
Hydrothermal Conditions ◽  
Content Type ◽  
X Ray ◽  
Quenching Effect ◽  
Sensing Material ◽  
Metal Organic

PurposeThe purpose of this study is to develop luminescence sensors for the detection of nitroaromatic compounds (NACs) and metal ions to protect human health and prevent environmental pollution.Design/methodology/approachThe composition and morphology of Eu-metal-organic frameworks (MOF) (1) were well characterized by powder X-ray diffraction, elemental analyses, Fourier-transform infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy and scanning electron microscopy. The emission spectrum displays that 1 has significant characteristic emission bands of Eu(III) ions. The authors further investigated the fluorescence sensing performances of 1 to NACs and metal ions.FindingsThe results show that Eu-MOF (1) exhibits significant fluorescence quenching effect toward p-nitroaniline and Fe3+ions with good stability and recyclability. This means that 1 can be used as a multifunctional sensing material for the detection of p-nitroaniline and Fe3+ions.Originality/valueThe authors have successfully synthesized a fluorescence Eu-based sensing material under hydrothermal conditions. In addition, the fluorescence property and sensing performances for detecting NACs and metal ions were studied. The results suggest that 1 has highly selective fluorescence quenching toward p-nitroaniline and Fe3+ions with not only high sensitivity and selectivity but also excellent stability and recyclability. Furthermore, this study has confirmed that the multifunctional MOF material is very useful in environment pollutants’ detection and monitoring.

scholarly journals Finding the Reaction Constant Between Humic Acid and Metal Ions by Fluorescence Quenching Effect

2018 ◽  
Vol 7 (3.32) ◽  
pp. 4
Author(s):  
Wen Po Cheng ◽  
Yi Tsang Lu ◽  
Ruey Fang Yu ◽  
Xin Ru Lin ◽  
Han Xin Li
Keyword(s):  
Humic Acid ◽  
Fluorescence Quenching ◽  
Acid Solution ◽  
Metal Ions ◽  
Complex Reaction ◽  
Quenching Effect ◽  
Aluminum Salts ◽  
Fecl3 Solution ◽  
Optimum Ph ◽  
Reaction Constant

Humic acid was used as the removal target for evaluating the coagulation efficiency in this study. When the metal ions mix with humic acid solution, a Fluorescence quenching effect may be observed conditionally. This effect can be described by Stern-Volmer linear equation which can be used for quantifying the quenching constant (KQ) of the Fluorescence quenching effect. In addition, the result of the quenching constant (KQ) was used to explain the electron-neutralization capability of the metal ions at different pH. The results indicated that there is no significant Fluorescence quenching effect between the additions of monovalent Na+ ion, divalent Ca2+ and humic acid. Otherwise, when pH of the FeCl3 solution was between 4.5 and 5.5, fluorescence quenching effect obviously occurred. The maximum KQ value was found to be 305,990 at pH 5. It means that the higher KQ value is, the better complex reaction between humic acid and aluminum salts will be. Through the KQ value study, the optimum pH can be quantified when humic acid solution is reacted with ferric ion. 

Fluorescence Quenching in Conjugated Polymers Blended with Reduced Graphitic Oxide

2010 ◽  
Vol 114 (9) ◽  
pp. 4153-4159 ◽  
Author(s):  
Yaobing Wang ◽  
Dharmalingam Kurunthu ◽  
Gary W. Scott ◽  
Christopher J. Bardeen
Keyword(s):  
Fluorescence Quenching ◽  
Conjugated Polymers

scholarly journals A water-soluble fluorescent chemosensor based on Asp functionalized naphthalimide for successive detection Fe3+ and H2PO4−

2018 ◽  
Vol 96 (4) ◽  
pp. 363-370 ◽  
Author(s):  
You-Ming Zhang ◽  
Xiao-Peng Chen ◽  
Guo-Yan Liang ◽  
Kai-Peng Zhong ◽  
Hong Yao ◽  
...  
Keyword(s):  
Fluorescence Quenching ◽  
Metal Ions ◽  
Aspartic Acid ◽  
High Selectivity ◽  
Fluorescent Sensor ◽  
Water Solution ◽  
Water Soluble ◽  
Selective Recognition ◽  
Actual Usage ◽  
Quenching Process

The selective recognition of target ions in water is very important and the development of novel water-soluble chemosensor is still an intriguing challenge. Herein, a novel water-soluble fluorescent sensor based on aspartic acid (Asp) functionalized 1,8-naphthalimide derivative (Asp-NI) has been designed and synthesized. The sensor Asp-NI could dissolve in water and successively detect Fe3+ and H2PO4− in water solution with high selectivity and sensitivity. The detection limits are 4.97 × 10−7 mol/L for Fe3+ and 5.27 × 10−6 mol/L for H2PO4−. Other coexistent competitive metal ions (Hg2+, Ag+, Ca2+, Cu2+, Co2+, Ni2+, Cd2+, Pb2+, Zn2+, Cr3+, and Mg2+) showed no interference in the Fe3+ detection process. The sensor Asp-NI could act as a Fe3+ and H2PO4− controlled “On–Off–On” fluorescent switch. More interestingly, the Fe3+ induced fluorescence quenching process could be totally reversed by the addition of H2PO4−, this “On–Off–On” switching process could be repeated several times with little fluorescence loss. Notably, the actual usage of sensor Asp-NI was further demonstrated by test kits.

scholarly journals Development and validation of a new spectrofluorimetric method for the determination of some beta-blockers through fluorescence quenching of eosin Y. Application to content uniformity test

2016 ◽  
Vol 14 (1) ◽  
pp. 258-266 ◽  
Author(s):  
Sayed M Derayea ◽  
Mahmoud A Omar ◽  
Mohamed Aboel-Kasem Abdel-Lateef ◽  
Ahmed I. Hassan
Keyword(s):  
Fluorescence Quenching ◽  
Beta Blockers ◽  
Dosage Forms ◽  
Ion Pair ◽  
Content Uniformity ◽  
Eosin Y ◽  
Pharmaceutical Dosage Forms ◽  
Quenching Effect ◽  
Spectrofluorimetric Method

AbstractA simple, rapid, sensitive and economic spectrofluorimetric method has been developed and validated for determination of some β-adrenergic blocking agents namely; betaxolol hydrochloride (BTX), carvedilol (CAR), labetalol hydrochloride (LBT), nebivolol hydrochloride (NEB) and propranolol hydrochloride (PRO). The method is based on the quenching effect of the cited drugs on the fluorescence intensity of eosin Y at pH 3.4 (acetate buffer). The fluorescence quenching is due to the formation of an ion-pair complex and was measured without extraction at 545 nm (λex. 301.5 nm). The factors affecting the formation of the ion-pair complex were carefully studied and optimized. Under the optimal conditions, the linear ranges for the relationship between the fluorescence quenching value and the concentration of the investigated drugs were 100-2500, 150-2500 and 50-2250 ng mL-1 for (BTX, CAR), (LBT, NEB) and (PRO) respectively. The method was validated according to ICH guidelines and was applied for determination of the cited drugs in pharmaceutical dosage forms with excellent recoveries. In addition, content uniformity testing of some commercial dosage forms was checked by the proposed method.

Fluorescence Quenching of Poly(aryl ether) Dendrimers by Metal Ions

2007 ◽  
Vol 23 (11) ◽  
pp. 1696-1700
Author(s):  
CHEN Jie ◽  
◽  
◽  
ZHAO Xin ◽  
CHEN Jin-Ping ◽  
...  
Keyword(s):  
Fluorescence Quenching ◽  
Metal Ions ◽  
Aryl Ether

A simple enzyme-catalyzed reaction induced “switch” type fluorescence biosensor based on carbon nitride nanosheets for the assay of alkaline phosphatase activity

The Analyst ◽  
2020 ◽  
Vol 145 (19) ◽  
pp. 6277-6282
Author(s):  
Xi Zhu ◽  
Huifeng Xu ◽  
Yan Zhan ◽  
Wenjing Li ◽  
Yongqiang Dong ◽  
...  
Keyword(s):  
Alkaline Phosphatase ◽  
Fluorescence Quenching ◽  
Phosphatase Activity ◽  
Alkaline Phosphatase Activity ◽  
Carbon Nitride ◽  
Quenching Effect ◽  
Fluorescence Switch ◽  
Switch Type ◽  
Fluorescence Biosensor ◽  
Carbon Nitride Nanosheets

An enzyme-catalyzed fluorescence “switch” type sensor was constructed for assay of alkaline phosphatase activity by combining the fluorescence quenching effect of Ag+ on ultrathin g-C3N4 nanosheets with the simple redox reaction of AA and Ag+.

Sign in / Sign up

Export Citation Format

Share Document