Abstract
Silver is a common catalyst in industrial production, and the frequent use of Ag+ can cause water pollution. Thus, the detection of Ag+ in the environment is necessary to determine the level of pollution from silver. In this work, we designed a new, highly selective near-infrared (NIR) fluorescent probe QCy to detect Ag+. The probe exhibits “turn-off” fluorescence quenching responses at 760 nm towards Ag+ over other relevant cations, with outstanding sensitivity and a low detection limit (0.03 µM), which is considerably lower than the standard of the World Health Organization (WHO) for drinking water (0.9 µM). Meanwhile, QCy showed a very good linearity at a low concentration of Ag+ with a ‘naked eye’ visible color change of solution from blue to red. The probe has been applied successfully for the detection of Ag+ in real water samples.
Highlights
Silver is a widely used resource in various fields, such as electronics manufacturing, pharmaceuticals, photography, and imaging [1]
Fluorescence detection methods have attracted increasing attention in the past few years, because they present the advantages of high selectivity and sensitivity, and they can be applied to real-time detection
Fluorescence detection methods are more convenient than traditional instrumental methods [14,15,16,17]
Summary
Silver is a widely used resource in various fields, such as electronics manufacturing, pharmaceuticals, photography, and imaging [1]. Reported an NS2 O2 -macrocycle-based fluoroionophore as a highly selective turn-on-type fluorescence chemosensor for Ag+ in a 1:1 (v/v) aqueous ethanol solution with a detection limit of 0.22 μM [19]. These probes are not sensitive enough to detect Ag+ in water samples. The heptamethine cyanine-based dye possesses excellent spectral properties, such as high molar absorptivity and fluorescence quantum yield and good stability. QCy showed high selectivity to Ag+ over other metal cations This probe can detect trace quantities of Ag+ in water samples
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