Abstract
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.
Highlights
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]
The results demonstrated that sensor 1 could be used as a selective ratiometric fluorescence sensor for detection of Ag+
There are only a few sensors for the detection of S2− with a dual method [32,63,64,65]. This is a first instance that a single chemosensor can recognize both silver(I) and sulfide, to the best of our knowledge
Summary
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]. Ag+ which has a strong interaction with amino and sulfhydryl groups can form hazardous complexes with nucleic acids, amino acids and so on [23,24] It is an acute environmental pollutant owing to a large consumption of silver [25,26,27]. The sensing mechanism of 1 toward sulfide was described by using Job plot, ESI-mass analyses and 1H NMR titration
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