A highly efficient and selective turn‐on fluorescent sensor for Hg²⁺, Ag⁺ and Ag nanoparticles based on a coumarin dithioate derivative

Abstract

Based on chelation-enhanced fluorescence, a new fluorescent coumarin derivative probe 3(1-(7-hydroxy-4-methylcoumarin)ethylidene)hydrazinecarbodithioate for Hg(2+), Ag(+) and Ag nanoparticles is reported. Fluorescent probe acts as a rapid and highly selective "off-on" fluorescent probe and fluorescence enhancement by factors 5 to 12 times was observed upon selective complexation with Hg(2+), Ag(+) and Ag nanoparticles. The molar ratio plots indicated the formation of 1:1 complexes between Hg(2+) and Ag(+) with the probe. The linear response range covers a concentration range 0.1 × 10(-5) -1.9 × 10(-5) mol/L, 0.1 × 10(-5) -2.3 × 10(-5) mol/L and 0.146 × 10(-12) -2.63 × 10(-12) mol/L for Hg(2+), Ag(+) and Ag nanoparticles, respectively. The interference effect of some anions and cations was also tested.

Fluorescence sensing of dichlorvos pesticide by the luminescent Tb(III)‐3‐ally‐salicylohydrazide probe

“…The binding constants ( K b ) at different temperatures were calculated based on the Benesi − Hildebrand equation (equation ): where [Q] represents the analytical concentration of P1, F 0 and F are the fluorescence intensities in the absence and presence of dichlorvos pesticide and …”

A New Thiosemicarbazone-Based Fluorescence “Turn-on” Sensor for Zn2+ Recognition with a Large Stokes Shift and its Application in Live Cell Imaging

“…Considering the observed gradual red-shifting emission from 550 nm to 572 nm ( Fig. 3) with increasing Zn 2+ concentration, Zn 2+ binding induced transformation of L from thione to thiol form is liable occurred [24,41], the latter results in a longer conjugation chain than that of the former and matching the longer-wavelength emission. The plausible binding mode of L and Zn 2+ is illustrated in Scheme 3.…”

Thiophene aldehyde-diamino uracil Schiff base: A novel fluorescent probe for detection and quantification of cupric, silver and ferric ions

“…Encouraged by these considerations, we developed DDUTS as a novel fluorescence probe for Ag + , Cu 2+ and Fe 3+ ions in aqueous solutions. Reports on fluorescent sensors for more than one metal ions are rare and is known for a few combination of metal ions, like Cu 2+ , Ni 2+ [52]; Zn 2+ , Ni 2+ [53,54]; Cu 2+ , Zn 2+ [55]; Cu 2+ , Hg 2+ [31]; Cu 2+ , Fe 3+ [26]; Mg 2+ , Zn 2+ [56]; Ag + , Zn 2+ [16]; Ni 2+ , Fe 3+ [45]; Hg 2+ , Ag + [11,57]; F À , Cu 2+ [58]; Pb 2+ , K + [59] and Pb 2+ , Al 3+ [60]. To the best of our knowledge, fluorescence sensing for ternary cation samples is still lacking in the literature, which shows the importance of the developed fluorescent sensor in both detection and quantification of Ag + , Cu 2+ and Fe 3+ ions.…”

“…Recently, several groups have reported the determination of silver, copper and iron ions using fluorescent probes. Silver ions have been fluorometrically detected by novel benzimidazole-based spirobifluorene derivative [9], SYBR Green I and a silver(I)-specific cytosine-rich oligonucleotide [10], coumarin dithioate derivative [11], naphthalimide and thiosemicarbazide-based sensor [12], graphene-based sensor [13], aza-crown-ether-appended xanthene [14], twin-cyano-sti lbene [15] and by the condensation product of acetylferrocene and ethylenediamine [16].…”