scholarly journals A turn-off fluorescent probe for the detection of Cu2+ based on a tetraphenylethylene-functionalized salicylaldehyde Schiff-base

2020 ◽  
Vol 4 (5) ◽  
pp. 1500-1506 ◽  
Author(s):  
Hai-Fang Xie ◽  
Chang-Jin Yu ◽  
Ya-Li Huang ◽  
Hong Xu ◽  
Qi-Long Zhang ◽  
...  
Keyword(s):  
Schiff Base ◽  
Fluorescent Probe ◽  
Limit Of Detection ◽  
Aqueous Media ◽  
High Sensitivity

A tetraphenylethylene-functionalized salicylaldehyde Schiff-base fluorescent probe (TPE-An-Py) with aggregation-induced enhanced emission (AIEE) characteristics exhibited high sensitivity towards copper(ii) ions in aqueous media with a “turn-off” fluorescence mechanism; limit of detection is 2.36 × 10−7 mol L−1.

scholarly journals A Schiff Base Fluorescence Enhancement Probe for Fe(III) and Its Sensing Applications in Cancer Cells

Sensors ◽  
2019 ◽  
Vol 19 (11) ◽  
pp. 2500 ◽  
Author(s):  
Na Hee Kim ◽  
Junho Lee ◽  
Sungnam Park ◽  
Junyang Jung ◽  
Dokyoung Kim
Keyword(s):  
Schiff Base ◽  
Laser Scanning ◽  
Fluorescence Enhancement ◽  
Aqueous Media ◽  
Cancer Cell Line ◽  
High Sensitivity ◽  
Fast Response ◽  
Laser Scanning Microscopy ◽  
Confocal Laser ◽  
Sensing Applications

We report a new Schiff base fluorescent probe which senses ferric ion, Fe(III), with a significant fluorescence enhancement response. The probe showed high sensitivity (0.8 ppb), and fast response time (<10 s) of Fe(III) in aqueous media. In addition, the probe showed the ability to sense Fe(III) in a HeLa cancer cell line, with very low cytotoxicity. As a new bio-imaging probe for Fe(III), it gave bright fluorescent images in confocal laser scanning microscopy (CLSM).

scholarly journals A Simple Turn-off Schiff Base Fluorescent Sensor for Copper (II) Ion and Its Application in Water Analysis

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1233
Author(s):  
Xing Zhang ◽  
Ling-Yi Shen ◽  
Qi-Long Zhang ◽  
Xian-Jiong Yang ◽  
Ya-Li Huang ◽  
...  
Keyword(s):  
Schiff Base ◽  
Fluorescent Probe ◽  
Fluorescent Sensor ◽  
Tap Water ◽  
Condensation Reaction ◽  
Aqueous Media ◽  
Sensitivity And Selectivity ◽  
One Step ◽  
Fluorescence Titrations ◽  
Nmr Titrations

An aniline-functionalized naphthalene dialdehyde Schiff base fluorescent probe L with aggregation-induced enhanced emission (AIEE) characteristics was synthesized via a simple one-step condensation reaction and exhibited excellent sensitivity and selectivity towards copper(II) ions in aqueous media with a fluorescence “ turn-off ” phenomenon. The detection limit of the probe is 1.64 × 10−8 mol·L−1. Furthermore, according to the results of the UV-vis/fluorescence titrations, Job’s plot method and 1H-NMR titrations, a 1:2 stoichiometry was identified. The binding constant between L and Cu2+ was calculated to be Ka = 1.222 × 103. In addition, the AIEE fluorescent probe L could be applied to detection in real water samples with satisfactory recoveries in the range 99.10–102.90% in lake water and 98.49–102.37% in tap water.

A remarkable effect of N,N-diethylamino functionality on the optoelectronic properties of a salicylimine-based probe for Al3+

2014 ◽  
Vol 43 (15) ◽  
pp. 5831-5839 ◽  
Author(s):  
Neeraj Neeraj ◽  
Ajit Kumar ◽  
Virendra Kumar ◽  
Rahul Prajapati ◽  
Sharad Kumar Asthana ◽  
...  
Keyword(s):  
Schiff Base ◽  
Fluorescent Probe ◽  
Aqueous Media ◽  
Optoelectronic Properties ◽  
Live Cell ◽  
Remarkable Effect

A new live-cell permeable, fluorescent probe comprised of a simple salicylimine-based Schiff base (SA1) has been developed for Al3+ with nano-molar sensitivity in aqueous media.

scholarly journals Schiff-Based Fluorescent-ON Sensor L Synthesis and Its Application for Selective Determination of Cerium in Aqueous Media

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Maria Sadia ◽  
Jehangir Khan ◽  
Robina Naz ◽  
Muhammad Zahoor ◽  
Ezzat Khan ◽  
...  
Keyword(s):  
Metal Ion ◽  
Limit Of Detection ◽  
Fluorescent Sensor ◽  
Aqueous Media ◽  
High Sensitivity ◽  
Transition Metal Ions ◽  
Acetonitrile Solution ◽  
Selective Determination ◽  
Sensitivity And Selectivity

In the present study, a fluorescent sensor L for sensing of Ce3+ ion was designed and characterized by XRD, 1HNMR, and FTIR. Its fluorescence behavior towards metal ion was examined by fluorescence spectroscopy. Chelation-enhanced fluorescence was shown by the sensor L upon interaction with Ce3+ ion. This fluorescent sensor exhibits high sensitivity and selectivity towards Ce3+ ion in acetonitrile solution, forming 2 : 1 (L : M) complex as determined by Job’s plot. Association constant was found to be 1×107 M−1 estimated from the Benesi-Hildebrand plot. No significant interference was observed in the presence of other studied alkali, alkaline, and transition metal ions. A rapid response was observed when employed for the determination of Ce3+ ion in spiked water samples with a limit of detection equal to 3.4×10−8 M.

scholarly journals A Zn(II)-Organic Framework as a Fluorescent Probe for the Aqueous Phase Detection of Nitroaromatic Explosive and Cr(III) ion

2021 ◽  
Author(s):  
Samrah Kamal ◽  
Mohd Khalid ◽  
M. Shahnawaz Khan ◽  
M. Shahid ◽  
Musheer Ahmad
Keyword(s):  
Fluorescent Probe ◽  
Aqueous Phase ◽  
Aqueous Media ◽  
Theoretical Data ◽  
High Sensitivity ◽  
Fine Tuning ◽  
Hazardous Substances ◽  
Phase Detection ◽  
Fluorescence Sensing ◽  
Running Water

Abstract From the perspective of environment, civilian safety and human health it is utmost important to selectively and sensitively detect hazardous substances in the running water. In the last few decades, metal organic frameworks (MOFs) have been utilized for the detection of lethal substances in the aqueous phase using fluorescence method. Herein, a highly fluorescent MOF, Zn-MOF-1, namely, {[Zn2(pydc)2(DMF)]·2DMF}n, based on the ligand pyridine-2,5-dicarboxylic acid (H2pydc), was synthesized by employing solvothermal conditions. The Zn-MOF-1 was thoroughly characterized by crystallographic, PXRD, elemental, FTIR, and TG analysis. Single crystal data elucidated the exact structure of Zn-MOF-1. Due to its better emission spectra, the fluorescence sensing behavior of Zn-MOF-1 was checked in the aqueous medium. It was found that Zn-MOF-1 could detect Cr3+ with high sensitivity and selectivity and serve as an excellent fluorescent probe for TNP among other interfering nitroaromatic compounds in aqueous media. Furthermore, a plausible sensing mechanism has been demonstrated employing UV-Visible, fluorescence, and theoretical data. The observed Ksv values for TNP and Cr3+ are 2.1×108 M-1 and 1.46×107 M-1, respectively. Selective fluorescence quenching with high Ksv values and low detection limits validates the superior sensing performance shown by Zn-MOF-1 toward TNP and Cr3+. Thus, the fine-tuning of MOF for the detection of hazardous substances in wastewater is a challenging task and needs to address in future endeavors.

scholarly journals Selective and Sensitive Detection of Cyanide Based on the Displacement Strategy Using a Water-Soluble Fluorescent Probe

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Ming La ◽  
Yuanqiang Hao ◽  
Zhaoyang Wang ◽  
Guo-Cheng Han ◽  
Lingbo Qu
Keyword(s):  
Aqueous Solution ◽  
Fluorescent Probe ◽  
Limit Of Detection ◽  
Aqueous Media ◽  
Water Soluble ◽  
World Health ◽  
Selective Detection ◽  
Highly Sensitive ◽  
Health Organization

A water-soluble fluorescent probe (C-GGH) was used for the highly sensitive and selective detection of cyanide (CN−) in aqueous media based on the displacement strategy. Due to the presence of the recognition unit GGH (Gly-Gly-His), the probeC-GGH can coordinate with Cu2+and consequently display ON-OFF type fluorescence response. Furthermore, thein situformed nonfluorescentC-GGH-Cu2+complex can act as an effective OFF-ON type fluorescent probe for sensing CN−anion. Due to the strong binding affinity of CN−to Cu2+, CN−can extract Cu2+fromC-GGH-Cu2+complex, leading to the release ofC-GGH and the recovery of fluorescent emission of the system. The probeC-GGH-Cu2+allowed detection of CN−in aqueous solution with a LOD (limit of detection) of 0.017 μmol/L which is much lower than the maximum contaminant level (1.9 μmol/L) for CN−in drinking water set by the WHO (World Health Organization). The probe also displayed excellent specificity for CN−towards other anions, including F−, Cl−, Br−, I−, SCN−,PO43-,N3-,NO3-, AcO−,SO42-, andCO32-.

scholarly journals A sensitive OFF–ON–OFF fluorescent probe for the cascade sensing of Al3+ and F− ions in aqueous media and living cells

RSC Advances ◽  
2020 ◽  
Vol 10 (36) ◽  
pp. 21629-21635 ◽  
Author(s):  
Lingjie Hou ◽  
Wenting Liang ◽  
Chenhua Deng ◽  
Caifeng Zhang ◽  
Bo Liu ◽  
...  
Keyword(s):  
Schiff Base ◽  
Fluorescent Probe ◽  
Schiff Base Ligand ◽  
Aqueous Media ◽  
Living Cells ◽  
Live Cells

A simple Schiff-base ligand 2-hydroxy-1-naphthaldehyde semicarbazone (HNS) was synthesized and applied to the sequential sensing of Al3+ and F− ions in aqueous media and live cells.

A facile fluorescent probe based on coumarin-derived Schiff base for Al3+ in aqueous media

2014 ◽  
Vol 39 ◽  
pp. 86-89 ◽  
Author(s):  
Yan-Ge Zhang ◽  
Zhao-Hua Shi ◽  
Li-Zi Yang ◽  
Xiao-Liang Tang ◽  
Yan-Qing An ◽  
...  
Keyword(s):  
Schiff Base ◽  
Fluorescent Probe ◽  
Aqueous Media

Logic gate behavior and intracellular application of a fluorescent molecular switch for the detection of Fe3+ and cascade sensing of F− in pure aqueous media

2019 ◽  
Vol 17 (32) ◽  
pp. 7497-7506 ◽  
Author(s):  
Romi Dwivedi ◽  
Divya P. Singh ◽  
Saumya Singh ◽  
Ashish K. Singh ◽  
Brijesh S. Chauhan ◽  
...  
Keyword(s):  
Schiff Base ◽  
Fluorescent Probe ◽  
Logic Gate ◽  
Aqueous Media ◽  
Selective Reduction ◽  
Molecular Switch ◽  
Highly Efficient ◽  
Coordination Sites

The nature and coordination sites of a Schiff base 3,3′-(1E,1′E)-(1,3-phenylenebis(azan-1-yl-1-ylidene))bis(methan-1-yl-1-ylidene)dinaphthalen-2-ol (APHN), are tuned by its selective reduction to design a highly efficient fluorescent probe RAPHN.

A cucurbit[7]uril-based supramolecular fluorescent probe for the detection of metronidazole with high sensitivity and strong anti-interference capacity

2021 ◽  
pp. 174751982110551
Author(s):  
Xuemei Hu ◽  
Huaqing Zhang ◽  
Mei Liu
Keyword(s):  
Fluorescent Probe ◽  
Limit Of Detection ◽  
High Sensitivity ◽  
Competitive Reaction ◽  
Standard Curve ◽  
Curve Method ◽  
Standard Curve Method ◽  
Liquid Milk ◽  
High Binding Affinity

We propose a new method for the selective detection of the antibiotic metronidazole (MNZ) using CB[7]-JAT (cucurbit[7]uril = CB[7] and JAT = jatrorrhizine) as a fluorescent probe, which is based on the competitive reaction between MNZ and JAT for the occupancy of the CB[7] cavity. The proposed method gives a good calibration curve in the concentration range of 0.38–60 μM, and the limit of detection for MNZ is 65 ng mL−1 with those obtained by the standard curve method. Moreover, the proposed method was successfully applied for the determination of MNZ in liquid milk. Most importantly, due to the high binding affinity between CB[7] and MNZ, the proposed method shows great anti-interference capacity to accurately detect MNZ in the presence of other antibiotics.

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