Nanomolar Detection of Ag^I Ions in Aqueous Medium by Using Naphthalimide‐Based Imine‐Linked Fluorescent Organic Nanoparticles – Application in Environmental Samples

Abstract

The synthesis of fluorescent organic nanoparticles (FONPs) with an imine‐linked 1,8‐naphthalimide‐based dipodal chemosensor for AgI is described. The FONPs were prepared by using a re‐precipitation method, and they were successfully applied for the nanomolar detection of AgI ions in aqueous media. More specifically, the chemosensor was utilized for the selective and ratiometric sensing of AgI in a concentration range 15–65 nM with a 15.5 nM detection limit. The work was extended to monitor the AgI concentration in samples of environmental importance.

A Phosphorescent Trinuclear Gold(I) Pyrazolate Chemosensor for Silver Ion Detection and Remediation in Aqueous Media

“…21 Sharma et al have demonstrated silver sensing using a fluorescent organic nanoparticle system. 22 Lastly, Schmittel et al has reported an iridium-based crown ether complex for detection of silver ions in the MeCN/H 2 O system. 23 To the best of our knowledge, this is the only demonstration of silver sensing employing a heavy-metal-based chemosensor in aqueous media.…”

“…Arulraj et al have reported the sensing of silver ions using the organic molecule thionine as a fluorescent probe . Sharma et al have demonstrated silver sensing using a fluorescent organic nanoparticle system . Lastly, Schmittel et al has reported an iridium-based crown ether complex for detection of silver ions in the MeCN/H 2 O system .…”

From Dual to Discriminatory Sensing of CN‐/F‐Using Isomeric Molecules and Ascertained by Spectroscopic and DFT Methods

“…This simultaneous change in wavelengths provides ratiometric response of (1) for both F − and CN − ions (Figure (b) and (d)) with detection limits of less than 1 μM (0.56 μM for F − and 0.79 μM for CN − ions). The binding constants and stoichiometry (1:2) of the interaction of (1) with TBAF and TBACN were determined by Lehrer‐Chipman equation as 4.9 x10 3 M −2 for F − and 1 x10 4 M −2 for CN − (Figure S21 and S22). The binding stoichiometries were also confirmed by Job's plot (Figure S23).…”