Gopal Das

DMAC acts a chemodosimetric probe offering highly selective, nanomolar optical detection of proline over 19 other amino acids. Its portable microfluidic device enables real-time, on-site detection of proline and monitoring of plant growth.

A significant turn-on emission was detected upon the interaction of CCY with BLG, a prevalent milk allergen, in HEPES buffer. Additionally, this was used to detect adulteration of camel milk.

Phase‐selective organogelators (PSOGs) have garnered substantial attention in recent years owing to their potential as oil‐scavenging materials in oil‐water separation. This review highlights the advancements in this area, specifically in the design of new gelator systems, which have the potential to be useful for oil spill remediation. It discusses various PSOG systems, focusing on their molecular structures and the plausible mechanisms that facilitate phase‐selective gelation of oil in biphasic mixtures of oil and water. Furthermore, the review examines the concept of selective oil gelation as a potential extension of this field for detecting fuel adulteration, emphasizing the real‐world applicability of these gelators as critical future objectives in this rapidly evolving domain.

Aggregation-induced emission luminogens (AIEgens) enable selective detection of fluoride (F ⁻ ) and cyanide (CN ⁻ ) via an “aggregation-to-detection” strategy, enabling rapid, reliable and real-time sensing for environmental and biological applications.

Three adipic dihydrazide-based receptors functionalized with a pyridine moiety were synthesized by varying the positions of “pyridine -N”, while one more receptor was fabricated as a control compound appended with phenyl moieties in the two arms instead of pyridine. The positional isomeric effects on the metallogelation behavior were investigated. Receptors ADH-Py-p and ADH-Py-m, having pyridine −N at the para and meta positions, respectively, were found to display selective metallogelation behavior in the presence of Ag⁺ (P-Ag-G) and Cd²⁺ (M-Cd-G), respectively, out of all the metal ions undertaken for our study. Interestingly, the metallogel P-Ag-G, formed in the presence of Ag⁺, eventually led to the spontaneous in situ formation of AgNPs inside the gel matrix. P-Ag-G and its gel nanocomposite were further utilized for an antibacterial study. The idea of selective metallogelation behavior of the receptor ADH-Py-m in the presence of toxic Cd²⁺ was then exploited for the detection of Cd²⁺ in the presence of other competitive metal ions in different real water samples through the naked eye, thus circumventing the need for any sophisticated instrumentation.

Metal oxoanions present significant challenges because of their high solubility in water and their charge characteristics. Among these, carcinogenic chromate and radioactive pertechnetate are particularly concerning. Conventional adsorbents often suffer from low recyclability and reduced selectivity to remove oxoanionic pollutants. Herein, we report a guanidinium‐based porous organic polymer (POF‐3) that selectively adsorbs CrO ₄ ²⁻ and TcO ₄ ⁻ from real‐life water samples. POF‐3 displays maximum adsorption capacities of 123 mg g ⁻¹ for chromate and 177 mg g ⁻¹ for perrhenate at pH = 6. The removal efficiency of POF‐3 at low concentrations of chromate and pertechnetate is very far below the corresponding EPA limit. The adsorption mechanism mainly follows electrostatic interaction and the ion exchange mechanism. Reducing carcinogenic Cr(VI) to Cr(III) is a crucial step; introducing thiophene in the structural backbone of POF‐3 facilitates the redox properties. Morphological transformation into a sheet‐like structure confirms the effective sorption of chromate and perrhenate. In this context, NMR titration of monomeric compound also suggests interaction of POF‐3(M) with guanidium sites of material towards chromate and perrhenate effectively, as proven by solid phase study. These effective adsorption capacities, faster kinetics, and ion exchange ability make it a promising solution for environmental remediation.