Luminescent Conjugated Microporous Polymers for Selective Sensing and Ultrafast Detection of Picric Acid

Abstract

Luminescent conjugated microporous polymers (CMPs) are one of the important class of porous organic materials that possess a fully π-conjugated skeleton and high surface area and have been utilized as light-emitting materials. In this work, we have designed and developed three luminescent CMPs based on truxene core (Tx-CMPs) via Suzuki−Miyaura cross-coupling reaction in one step. The flexible aryl linker in Tx-CMPs prevents the possibility of aggregation-caused quenching (ACQ) due to π−π stacking of layers and thus offers a high luminescence in the synthesized Tx-CMPs. All Tx-CMPs possess a high BET surface area (S BET = 788−915 m 2 g −1 ) and excellent thermal stability. Utilizing the fluorescent nature and electron-rich property of the Tx-CMPs, we exploited them as a sensor for the selective and sensitive detection of picric acid (PA) among various nitroaromatic explosives. The Stern−Volmer constant (K SV ) for PA was estimated as 3.97 × 10 4 , 7.35 × 10 4 , and 2.39 × 10 4 M −1 for Tx-CMP-1, Tx-CMP-2, and Tx-CMP-3, respectively, indicating that PA can quench the fluorescence intensity of Tx-CMP-2 most efficiently. The detection limits of Tx-CMPs toward PA were found in the nanomolar range.

Processable Conjugated Microporous Polymer Gels and Monoliths: Fundamentals and Versatile Applications

“…Photoluminescence is of great significance for the applications of materials in the fields of optics, biomedicine, and environmental monitoring. Compared with insoluble powdered CMPs, − the processable CMP-based materials have enhanced quantum yield and photoluminescence properties. , For instance, the processable photoluminescent CMP (TBDC-BZ) synthesized by tetrakis­(4-bromophenyl)-5,5-dioctyl cyclopentadiene (TBDC) with benzothiadiazole (BZ) (Figure a), which shows strong yellow fluorescence with a highly polar excited state in tetrahydrofuran . Suitable dyes, such as 5-octyl-1,2,3,4,5-pentaphenyl-1,2-cyclopentadiene (OPCP) and perylene red (PR), are subsequently encapsulated into the TBDC-BZ matrix to form solutions, nanoparticles, gels, and films.…”

The preparation of 3,4‐ethylenedioxy thiophene (EDOT)‐based conjugated microporous polymers by direct arylation polymerization and fluorescence‐sensing nitro‐aromatic compounds and iodine

“…Nitro‐aromatic compounds (NACs), especially 2,4‐dinitrophenol (DNP) and p‐nitrophenol (p‐NP), are both the dangerous explosives and the common environmental pollutants, which threat human health and national homeland security. Therefore, the detection of NACs is very attractive and vital 46–50 . In addition, molecular iodine (I 2 ) and its compounds are important reactants or catalysts for preparing drugs, food additives, dyes, pesticides, and other chemicals.…”

“…Therefore, the detection of NACs is very attractive and vital. [46][47][48][49][50] In addition, molecular iodine (I 2 ) and its compounds are important reactants or catalysts for preparing drugs, food additives, dyes, pesticides, and other chemicals. The iodinecontaining substances are also widely used in medicine and food.…”

Optical and Acoustic Synergetic Sensing Platform Enabled by a Pyrene-Based Conjugated Polymer Self-Circulating Amplified System for Lung Cancer Detection

“…The first stage named as the signal sensitization evoking phase (SSEP) showed immediate improvement and then transient reduction, which can be explained by the gradual consumption of Py-CPs that employed as an excellent coreactant because of its extended π-conjugation systems with exceptional charge mobility. 10 Then, the ECL luminescence of Ru(phen) 3 2+ produced in the SSEP was conversely used as irradiation light to promote the in situ generation of •OH from O 2 with the assistance of photosensitizer Py-CPs, 11,12 engendering stronger and more stable ECL response, which is defined as the signal sensitization stabilize phase (SSSP). Such a selfcirculating ECL enhancement mechanism is a good choice for researchers attempting to obtain a high and stable ECL signal with good temporal and spatial resolution.…”