Hydrogen bond directed high-fidelity optical detection of picric acid: A single driver on diverse roads towards the same destiny

Abstract

High-fidelity optical detection of picric acid is the urge of the time due to its toxic and explosive nature. Moreover, Picric acid is a molecule with versatile features like hydrogen...

AIE active fluorescent organic nanoparticles based optical detection of Cu2+ ions in pure water: a case of aggregation–disaggregation reversibility

“…1–4 Now, among common Cu 2+ ion detection techniques like inductively coupled plasma mass spectroscopy (ICP-MS), 6 atomic absorption spectrometry, 7 inductively coupled plasma atomic emission spectrometry (ICP-AES), 8 anodic stripping voltammetry (ASV), 9 and voltammetry, 10 fluorescent detection has shown some additional benefits like low-cost and reusable chemosensors, excellent selectivity, sufficient sensitivity, ease of operation, and biocompatible in vivo detection. 11–25 Naturally, fluorescent detection of Cu 2+ ion in 100% aqueous medium is the need of the hour. Besides, copper plays dual-directional reverse roles with some positive and negative impacts.…”

D–π–A–π–D-Configured Imidazole-Tethered Benzothiadiazole-Based Sensor for the Ratiometric Discrimination of Picric Acid: Applications in Latent Fingerprint Imaging

“…To overcome these limitations, molecules incorporating imidazole with a basic nitrogen atom attracted us toward their facile synthesis (one-pot reaction), and it promotes distinct emission behavior after the interaction with nitro explosives. However, most of the receptors exhibit fluorescence quenching response toward explosives through a photoinduced electron transfer (PET) mechanism − or energy transfer mechanism. − Turn-off fluorescence sensing is inferior to turn-on or ratiometric fluorescence detection, as the former is efficiently inhibited by instabilities in background fluorescence, resulting in a lack of reliability. Hence, there is a crucial need to develop a fluorophore with desired characteristics such as significant Stokes shift, high quantum yield, ratiometric optical response, and greater selectivity for developing a vital fluorescent probe for the detection of target analytes.…”

An Imidazole-Naphthalimide-Based pH-Sensitive Molecular Probe for Selective Detection of Picric Acid and Cell Imaging

“…Due to operational simplicity, cost-effectiveness, high sensitivity, and selectivity, fluorescence-based materials, such as fluorescent chemosensors, 35 AIEE active materials, 36 gelators, 37 conjugated polymers, 38−40 fluorescent nanofibers, 41 and nanoparticles, 42 have gained much importance for the detection of NACs. 2,6,33,34 However, most of the sensors developed showed fluorescence quenching with PA through different phenomena of the photophysical mechanism, 43 while a limited number of chemosensors are known to detect PA through enhanced emission. 44−50 Furthermore, in the body, purine metabolism produces uric acid (UA, pK a ≈ 5.6).…”