“…The results demonstrated that sensor 1 could be used as a selective ratiometric fluorescence sensor for detection of Ag + . Importantly, the use of 1 as a ratiometric fluorescence sensor for Ag + might be very meaningful, because only a few ratiometric fluorescence silver sensors have been reported to date [ 9 , 26 , 56 – 59 ]. Figure 1.…”
Section: Resultsmentioning
confidence: 99%
“…very meaningful, because only a few ratiometric fluorescence silver sensors have been reported to date [9,26,[56][57][58][59].…”
Section: Fluorescence Ratiometric Response Of 1 Toward Ag +mentioning
confidence: 99%
“…To date, many researchers have studied many analytical methods for the detection of various analytes of metal ions and anions such as atomic absorption spectroscopy, surface-enhanced Raman scattering, ion-selective electrodes and inductively coupled plasma mass spectrometry [1][2][3][4][5][6]. However, these methods have required complicated procedures, operator and great expense [7][8][9][10][11]. In contrast, a chemosensor using fluorescent and colorimetric 2018 The Authors.…”
A multi-functional chemosensor 1 as silver and sulfide detector was synthesized by the combination of octopamine and 4-dimethylaminocinnamaldehyde. Sensor 1 exhibited a ratiometric fluorescence emission for Ag+ from blue to sky. The binding mode of 1 and Ag+ turned out to be a 1 : 1 ratio as determined using Job plot and electrospray ionization (ESI) mass spectral analyses. The sensing mechanism of 1 with silver ion was unravelled by 1H NMR titrations and theoretical calculations. Sensor 1 also discerned sulfide by enhancing fluorescence intensity and changing colour from yellow to colourless in aqueous solution. The sensing properties of 1 toward S2− were investigated by using ESI-mass analysis, Job plot and 1H NMR titrations. Moreover, 1 could be used as a detector for sulfide in a wide pH range.
“…The results demonstrated that sensor 1 could be used as a selective ratiometric fluorescence sensor for detection of Ag + . Importantly, the use of 1 as a ratiometric fluorescence sensor for Ag + might be very meaningful, because only a few ratiometric fluorescence silver sensors have been reported to date [ 9 , 26 , 56 – 59 ]. Figure 1.…”
Section: Resultsmentioning
confidence: 99%
“…very meaningful, because only a few ratiometric fluorescence silver sensors have been reported to date [9,26,[56][57][58][59].…”
Section: Fluorescence Ratiometric Response Of 1 Toward Ag +mentioning
confidence: 99%
“…To date, many researchers have studied many analytical methods for the detection of various analytes of metal ions and anions such as atomic absorption spectroscopy, surface-enhanced Raman scattering, ion-selective electrodes and inductively coupled plasma mass spectrometry [1][2][3][4][5][6]. However, these methods have required complicated procedures, operator and great expense [7][8][9][10][11]. In contrast, a chemosensor using fluorescent and colorimetric 2018 The Authors.…”
A multi-functional chemosensor 1 as silver and sulfide detector was synthesized by the combination of octopamine and 4-dimethylaminocinnamaldehyde. Sensor 1 exhibited a ratiometric fluorescence emission for Ag+ from blue to sky. The binding mode of 1 and Ag+ turned out to be a 1 : 1 ratio as determined using Job plot and electrospray ionization (ESI) mass spectral analyses. The sensing mechanism of 1 with silver ion was unravelled by 1H NMR titrations and theoretical calculations. Sensor 1 also discerned sulfide by enhancing fluorescence intensity and changing colour from yellow to colourless in aqueous solution. The sensing properties of 1 toward S2− were investigated by using ESI-mass analysis, Job plot and 1H NMR titrations. Moreover, 1 could be used as a detector for sulfide in a wide pH range.
“…13 In recent years, several fluorescent sensors containing sulfur atoms for determination of Ag + have been reported. [14][15][16] However, most of these sensors exhibited poor water solubility, resulting in their limitations in cell permeability and the application in aqueous environmental and biological samples. Therefore, the hydrosoluble Ag + fluorescent sensor is needed.…”
A "turn on" fluorescent sensor based on 2- [4-(2-aminoethylthio)butylthio]ethanamine ionophore and [5]helicene fluorophores, MC4 was developed for detection of Ag + . An aqueous ethanol solution, an environmental friendly condition, was chosen as a working condition. MC4 exhibited Ag + -induced fluorescent enhancement with a low detection limit of 32 ppb for Ag + . The detection limit of the sensor was below the permissible concentrations of Ag + for drinking water as regulated by the United States Environmental Protection Agency (U.S. EPA) and World Health Organization (WHO). Moreover, MC4 exhibited a strong fluorescent signal and expansive stokes shift of 213 nm. This very expansive stokes shift could reduce interferences from self-absorption and auto-fluorescence. The sensor also provided highly selective recognition of Ag + , distinguishing it from other competing ions through the photoinduced electron transfer (PET). Importantly, this sensor is able to track Ag + in HepG2 cells, indicating that it shows good potential for practical applications.
“…Some traditional methods for determination of silver in environmental samples include various instrumental techniques such as atomic absorption spectrometry (AAS), electrothermal atomic absorption spectrometry (ETAAS), inductively coupled plasma mass spectrometry (ICP‐MS), inductively coupled plasma atomic emission spectrometry (ICPAES), ion chromatography and various electrochemical methods [24(f–i)] in different media. The requirement of bulky and expensive instrumentation and time‐consuming sample preparation methods make such methods unsuitable for convenient use . Also, sensing of ions in aqueous medium in general is a challenging problem .…”
Despite its antibacterial activity, silver also posses potential threats to the environment and human health. An excess of silver nanoparticles (AgNPs) released from various sources may enter the environment and have adverse effects on microbial communities. Therefore detection of free silver becomes an important task especially in aqueous medium. In this work, we have synthesized polyamine‐based ratiometric silver sensor 3. In order to evaluate the activity of 3 in aqueous medium, it was processed into organic nanoparticles using re‐precipitation method. The prepared nanoparticles were characterized using techniques like dynamic light scattering (DLS) and transmission electron microscopy (TEM). The detection limit of this sensor is determined to be 2 nM. Silver sink effect of the synthesized probe has also been determined using E. coli as a bacterial probe.
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