Unusual redshift due to selective hydrogen bonding between F⁻ ion and sensor motif: a naked eye colorimetric sensor for F⁻ ions in an aqueous environment

Abstract

Naked-eye detection of anions is a challenging but useful technique. In this study, two novel colorimetric monomeric sensors based on highly selective 2,4-dinitrophenylhydrazine were designed, synthesized, and employed as a...

In Situ Ni(II) Complexation Induced Deprotonation of Bis-Thiourea-Based Tweezers in DMSO–Water Medium: An Approach toward Recognition of Fluoride Ions in Water with Organic Probe Molecules

“…However, most of these methods involve sophisticated instrumentation requiring expertise knowledge and are not cost-effective for routine monitoring, specifically in remote areas. Among these, the ISE is relatively cost-effective and the most widely used for the assessment of the F – ion in groundwater, but the presence of the Al­(III) ion in water severely undermines the detection efficiency of F – through the formation of an Al­(III)–fluoride complex. , On the contrary, optical methods (colorimetric and fluorometric) are potential alternatives because of their easy operation and higher sensitivity. − The SPADNS-zirconium method has been one of the standard colorimetric estimation methods for the fluoride ion in aqueous medium. Although the performance of this method is satisfactory, the method is susceptible to interference by Al 3+ , Cl – , Fe 3+ , SO 4 2– , and PO 4 3– ions, demanding the removal of the interfering ions from the sample prior to estimation .…”

Highly Efficient Multi‐Tasking Porphyrin‐Based Chemosensor for Mercury Ions

“…[33][34][35][36] To create such a system for detecting mercury contamination, both colorimetric and fluorometric systems are advantageous than all other systems, as fluorescence response we can get in the presence of a minimal amount of analyte and colorimetric response responsible for naked-eye detection. [37,38] So, to enhance the sensitivity and selectivity of Hg 2 + ions, we have taken porphyrin moiety with the amino groups for larger space and specific interaction sites. [39,40] As it has very sharp absorption and emission bands at the NIR region, porphyrin can be a very efficient host for guest molecules.…”