chelation enhanced fluorescence
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Chemosensors ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 32
Author(s):  
Boeon Suh ◽  
Dongkyun Gil ◽  
Sojeong Yoon ◽  
Ki-Tae Kim ◽  
Cheal Kim

A practical hydrazine-carbothioamide-based fluorescent chemosensor TCC (N-(4-chlorophenyl)-2-(thiophene-2-carbonyl)hydrazine-1-carbothioamide) was applied for Zn2+ detection. TCC exhibited selective fluorescence emission for Zn2+ and did not show any interference with other metal ions. In particular, TCC was utilized for the detection of Zn2+ in paper strips, zebrafish and real water samples. TCC could detect Zn2+ down to 0.39 μM in the solution phase and 51.13 μM in zebrafish. The association ratio between TCC and Zn2+ was determined to be 2:1 by ESI-mass and Job plot. The sensing mechanism of TCC for Zn2+ was illustrated to be a chelation-enhanced fluorescence process through spectroscopic experiments and theoretical calculations.


2022 ◽  
Author(s):  
Jialin Ma ◽  
yuwei dong ◽  
Zhou Yu ◽  
Yan Wu ◽  
Zhen Zhao

A new fluorescent probe based on pyridine Schiff base (2-(pyridine-2-ylmethylene)phenoxyaniline, PMPA) working with PET mechanism and chelation enhanced fluorescence (CHEF) was designed and synthesized for the selective detection of cadmium...


2021 ◽  
Author(s):  
Gyeongjin Kim ◽  
Donghwan Choi ◽  
Cheal Kim

Abstract A new benzothiazole-based chemosensor BTN (1-((Z)-(((E)-3-methylbenzo[d]thiazol-2(3H)-ylidene)hydrazono)methyl)naphthalen-2-ol) was synthesized for the detection of Cu2+. BTN could detect Cu2+ with “off-on” fluorescent response from colorless to yellow irrespective of presence of other cations. Limit of detection for Cu2+ was determined to be 3.3 µM. Binding ratio of BTN and Cu2+ turned out to be a 1:1 with the analysis of Job plot and ESI-MS. Sensing feature of Cu2+ by BTN was explained with theoretical calculations, which might be owing to internal charge transfer and chelation-enhanced fluorescence processes.


2020 ◽  
Vol 4 (11) ◽  
pp. 3338-3348
Author(s):  
Jianxing Xu ◽  
Jingwen Xiong ◽  
Yanlin Qin ◽  
Zongzhi Li ◽  
Chengqiang Pan ◽  
...  

A new 8-hydroxyquinoline derivative TPE(OH)-8HQ, has been synthesized and evaluated as an efficient fluorescence “turn-on” sensor for detection of Zn2+ based on the chelation-enhanced fluorescence (CHEF) mechanism in neutral aqueous solution.


2019 ◽  
Vol 102 ◽  
pp. 171-179 ◽  
Author(s):  
Vetriarasu Venkatesan ◽  
Selva Kumar R ◽  
S.K. Ashok Kumar ◽  
Suban K. Sahoo

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