Zinc metal complex as a sensor for simultaneous detection of fluoride and HSO₄⁻ions

Abstract

A Schiff base based tripodal receptor was synthesized and complexed with a zinc metal ion (n17) using a very easy single step process. The resulting complex was fully characterized by CHN and single crystal XRD. The real time application of the complex in aqueous media was devised by preparing its organic nanoparticles (ONPs) and their sensor activity was tested with various anions by observing changes in the fluorescence profile of n17. It was observed that ONPs of n17 responded excellently for fluoride and sulfate, producing two different signals, with detection limits of 4.84 × 10(-12) M and 5.67 × 10(-9) M respectively, without having any interference from each other. The real time application of the sensor was also tested using various samples collected from various daily utility items and found to respond exceptionally well.

Visible Light Controlled Aggregation of a Spiropyran‐HSO4− Complex as a Strategy for Reversible Detection in Water

“…The literature survey revealed only a few selective HSO 4 − sensor in pure water . The other examples include indolinium dyes, azo dyes, quinoline based receptors, metal‐organic complex, BODIPY based receptor and adamantane‐dipyrromethane conjugate . In this context, spiropyran is also used to construct sensors for ionic species owing to abrupt changes in optical signal on coordination with ionic species .…”

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).…”

Switchable Optical Probes for Simultaneous Targeting of Multiple Anions

“…[80] Recently Singh et al have developed a tripodal Zn 2 + complex (11) for simultaneous detection of both F À and HSO 4 À ion. [81] Though both of these anions formed ternary adduct with the Zn 2 + complex, distinguishable signals could be obtained due to differences in their binding modes. Fluoride ion due to its smaller size could easily accommodate into the cavity of the metal complex, resulting in larger separation among the aromatic rings.…”

“…Recently Singh et al . have developed a tripodal Zn 2+ complex ( 11 ) for simultaneous detection of both F − and HSO 4 − ion . Though both of these anions formed ternary adduct with the Zn 2+ complex, distinguishable signals could be obtained due to differences in their binding modes.…”