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Copper nanoclusters @ nitrogen-doped carbon quantum dots-based ratiometric fluorescence probe for lead (II) ions detection in porphyra
摘要： A novel ratiometric fluorescence probe was proposed for detecting lead (II) ions (Pb2+) in porphyra, the approach was based on copper nanoclusters and nitrogen-doped carbon quantum dots (CuNCs-CNQDs). In this probe, the CuNCs delivered the response signal, the fluorescence of which was enhanced by Pb2+ due to the aggregation-induced emission enhancement (AIEE) between Pb2+ and CuNCs. The CNQDs provided the self-calibration signal, whose fluorescence remained almost unchanged in coexistence with Pb2+. According to the change of fluorescence intensity ratio between the fluorophores, CuNCs–CNQDs nanohybrid was used as ratiometric probes for the sensitive detection of Pb2+ in the range of 0.010 to 2.5 mg L-1, with a detection limit of 0.0031 mg L-1. Finally, the probe was successfully applied to detect Pb2+ in porphyra with relative standard deviations (RSDs) lower than 5%. This study provides a straightforward, stable, and sensitive approach for detecting Pb2+ in porphyra.
关键词： Lead (II) ions,Ratiometric fluorescence probe,Aggregation-induced emission enhancement,Copper nanoclusters,Nitrogen-doped carbon quantum dots
更新于2025-09-23 15:21:01
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Electronically-tuned 2-(2′-Hydroxyphenyl)-4-pyrenylthiazole through Bond Energy Transfer Donor-Acceptor Couples: Sensing and Biological Applications
摘要： A novel pyrene-conjugated 2-(20-hydroxyphenyl)thiazole probe (HPTP, 1) was prepared, and its photophysical and sensing properties were investigated and compared to those of four model compounds. HPTP effectively detects CN? and glycerol in DMSO, with “turn off” at 425 nm and “turn on” at 495 nm. The sensing ability of 1 towards CN? ions in DMSO, mediated by the hydrogen bonding-induced disaggregation of aggregates, resulted in the quenching of ESIPT emission at 425 nm. By contrast, in a DMSO–glycerol mixed medium, the aggregate size increased together with the increased degree of intermolecular π–π interactions between two pyrene units located on adjacent molecules, and resulted in partial inhibition of energy/charge transfer from the pyrene unit to the thiazole unit in the excited state. Excitation energy transfer with increased photostability of the ESIPT core was effectively demonstrated in Candida albicans cell lines.
关键词： Glycerol,Pyrene,CN?,Excited state intramolecular proton transfer,2-(2’-Hydroxyphenyl)thiazole,Aggregation-induced emission
更新于2025-09-23 15:21:01
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Spatiotemporal dynamics of aggregation-induced emission enhancement controlled by optical manipulation
摘要： We present spatiotemporal control of aggregation-induced emission enhancement (AIEE) of a protonated tetraphenylethene derivative by optical manipulation. A single submicrometer-sized aggregate is initially confined by laser irradiation when its fluorescence is hardly detectable. The continuous irradiation of the formed aggregate leads to sudden and rapid growth, resulting in bright yellow fluorescence emission. The fluorescence intensity at the peak wavelength of 540 nm is tremendously enhanced with growth, meaning that AIEE is activated by optical manipulation. Amazingly, the switching on/off of the activation of AIEE is arbitrarily controlled by alternating the laser power. This result means that local concentration, which increases the optical manipulation tool overcomes the electrostatic repulsion between the protonated molecules, namely, optical manipulation changes the aggregate structure. The dynamics and mechanism in AIEE controlled by optical manipulation will be discussed from the viewpoint of molecular conformation and association depending on the laser power.
关键词： Aggregation-induced emission enhancement,Fluorescence microspectroscopy,tertiary ammonium-appended tetraphenylethene,Spatiotemporal control,Optical manipulation
更新于2025-09-23 15:19:57
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Cisplatin-Loaded Polymeric Micelles with Aggregation-Induced Emission Feature for Cellular Imaging and Chemotherapy
摘要： Imaging-guided disease theranostic nanoplatforms based on polymeric micelles have drawn a broad attention because of their clear visualization, reduced systemic toxicity, enhanced utilization of drugs, and suppressed chemoresistance of tumors, which makes them possess potential application for cancer therapy. Herein, we synthesized a polymeric nanoparticles (Poly (MAD-alt-OCE)-PTZ-PEG) with novel aggregation-induced emission (AIE) characteristic based on cheap commercial polymer by the simple and environmental method. These Poly(MAD-alt-OCE)-PTZ-PEG nanoparticles (NPs) show excellent biocompatibility and fluorescence property, which makes them huge application potential for cellular imaging. Furthermore, the antitumor drug cisplatin Pt(IV) can be loaded efficiently onto the surface of Poly(MAD-alt-OCE)-PTZ-PEG NPs due to the existence of abundant carboxyl groups on the NPs surface. The well-controlled Pt(IV)-loaded yield and great acid-responsive drug release of these polymeric micelles enhance cytotoxicity against cancer cells in vitro. Given the cheap raw materials, eco-friendly method, excellent AIE property, efficient antitumor drug delivery and pH-controlled drug release, these polymeric NPs would be a potential candidate for cancer diagnosis and therapy in the future.
关键词： Aggregation-induced emission,Drug delivery,Cellular imaging,Polymeric nanoparticles
更新于2025-09-23 15:19:57
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Luminescent Solar Concentrators Based on Renewable Polyester Matrices
摘要： This study reports for the first time the use of bio-based alternatives for PMMA as host matrix for luminescent solar concentrators (LSCs). Notably, two types of renewable polyesters were synthesized in varying molar ratios via a two-step melt-polycondensation reaction with dibutyl tin oxide as catalyst. The first is a homopolymer of diethyl 2,3:4,5-di-O-methylene galactarate (GxMe) and isosorbide (IGPn), and the second is a random copolymer of GxMe with 1,3-propanediol and dimethyl terephthalate (GTPn). The two polyesters were found to be optically transparent, totally amorphous with a Tg higher than 45 8C and temperature resistance comparable to PMMA. Lumogen Red (LR) and an aggregation-induced emission (AIE) fluorophore, TPETPAFN, were utilized as fluorophores and the derived thin polymer films (25 mm) were found highly homogeneous, especially for those prepared from GTPn, possibly due to the presence of compatibilizing terephthalate units in the matrix composition and the higher molecular weight. The spectroscopic characterization and the optical efficiency determination (hopt) evidenced LSCs performances similar or superior to those collected from LR/PMMA thin films. Noteworthy, hopt of 7.7 % and 7.1 % were recorded for the GTPn-based matrix containing LR and TPETPAFN, respectively, thus definitely supporting the bio-based polyesters as renewable and highly high-performance LSCs.
关键词： luminescent solar concentrators,renewable host matrices,aggregation-induced emission,fluorophores,polyesters
更新于2025-09-23 15:19:57
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Self-agglomerated crystalline needles harnessing ESIPT and AIEE features for the ‘turn-on’ fluorescence detection of Al <sup>3+</sup> ions
摘要： We report the synthesis of probe 2 for the fluorescence "turn-on" detection of Al3+ ions in CH3OH. Probe 2 has been designed via utilizing the aggregation-induced emission properties of the tetraphenylethylene unit, with further enhancement from Schiff base units for the ESIPT phenomenon. Probe 2 exhibits emission at 548 nm (lex = 360 nm), with a large Stokes shift of 188 nm, indicating the ESIPT phenomenon. Probe 2 also exhibits emission enhancement via increasing the H2O ratio up to 70–90% H2O/THF (v/v) and altering the spherical morphology to needle shapes. Probe 2 has been found to be highly selective and sensitive towards Al3+ ions over other metal ions in pure CH3OH using absorption and emission spectroscopy. FESEM analysis revealed that the size of probe 2 increases upon the addition of Al3+ ions. Thus, the fluorescence "turn-on" behaviour of probe 2(cid:2)Al3+ is due to metal-induced aggregation.
关键词： fluorescence detection,ESIPT,Al3+ ions,AIEE,aggregation-induced emission
更新于2025-09-19 17:15:36
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Multistimuli-responsive small-molecule compound with aggregation-induced emission enhancement characteristics: preparation, properties and applications
摘要： A novel multifunction luminescent small-molecule compound with hydrophilic chains was successfully designed and synthesized, which exhibited aggregation-induced emission enhancement (AIEE) characteristics. Even more interesting, it exhibited responsive behavior to temperature, pH and UV irradiation. In aqueous solution, its luminescence intensity showed temperature sensitivity. Initially, its luminescence intensity decreased slightly with an increase in temperature, which was enhanced greatly when the temperature increased to its lower critical solution temperature (LCST). With a further increase in temperature, there was a significant decline in its luminescence intensity. Additionally, it showed different pH and UV irradiation responsive behaviors in water and THF solution. In THF solution, its luminescence intensity was enhanced greatly with the addition of alkali, but it decreased with an increase in UV irradiation time. In aqueous solution, its luminescence intensity was enhanced slightly and its LCST decreased first and then increased with the addition of alkali. However, its luminescence intensity increased with an increase in UV irradiation time. The prepared small-molecule compound could also be used as a rewritable material with solid alkali or alkali solution used as ink and ordinary paper adsorbed with our prepared small-molecule compound used as rewritable paper.
关键词： small-molecule compound,rewritable material,temperature sensitivity,pH responsive,multistimuli-responsive,aggregation-induced emission enhancement,UV irradiation responsive
更新于2025-09-19 17:15:36
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Amphiphilicity Regulation of Ag(I) Nanoclusters: Self-Assembly and its Application as Luminescent Probe
摘要： Research on the self-assembly of various amphiphilic molecules is relatively hot and of great significance. However, new kind of metal nanoclusters (NCs) based amphiphilic molecule has rarely been explored. Herein, hydrophobic cations 1-hexadecyl-3-methylimidazolium (C16mim+) were chosen to modify hydrophilic (NH4)6[Ag6(mna)6] (Ag6-NCs, H2mna = 2-mercaptonicotinic acid) and Ag6@C16mim-NCs were obtained. Ag6@C16mim-NCs performed a thermotropic liquid crystal and thermofluorescence property. Moreover, the Ag6@C16mim-NCs exhibits benign amphiphilicity which could self-assembly into ordered nanosheets and nanorods aggregates in water/dimethyl sulfoxide (DMSO) binary solvents while single Ag6-NCs does not. Meanwhile, the Ag6@C16mim-NCs also performs aggregation-induced emission (AIE) property owing to the restriction of intramolecular vibration of the capping ligands. Furthermore, it can be found that the luminescent aggregates could detect arginine selectively with the detection limit (DL) at 28 uM. This study introduced a new kind of metal NCs-based amphiphilic molecule in a supramolecular self-assembly field and make it a candidates as optical materials in applied research.
关键词： Silver (I) nanocluster,aggregation-induced emission,self-assembly,amphiphilicity,sensor
更新于2025-09-19 17:15:36
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Stimuli‐Responsive Luminescent Copper Nanoclusters in Alginate and Their Sensing Ability for Glucose
摘要： Visually observable pH-responsive luminescent materials are developed through integrating the properties of aggregation-induced emission enhancement of Cu nanocluster (NCs) and the Ca2+ triggered gelatin of alginate. Sodium alginate, CaCO3 nanoparticles and Cu NCs are dispersed in aqueous solution, which is in a transparent fluid state, showing a weak photoluminescence (PL). The introduced H+ can react with the CaCO3 nanoparticles to produce free Ca2+, which can cross-link the alginate chains into gel networks. Meanwhile, a dramatically increase on the PL intensity of Cu NCs and a blue shift on the PL peak appeared, assigned to the Ca2+ induced enhancement and gelatin induced enhancement, respectively. Their potential application as a sensor for glucose is also demonstrated based on the principle that glucose oxidase can recognize glucose and produce H+, which further triggers the above mentioned two-stage enhancement. A linear relationship between the PL intensity and concentration of glucose in the range of 0.1 to 2.0 mM is obtained, with a limit of detection calculated as 3.2×10-5 M.
关键词： alginate,stimuli‐responsive materials,aggregation-induced emission,photoluminescence,metal nanoclusters,glucose
更新于2025-09-19 17:15:36
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Formation of emissive nanoparticles from tetraphenylethylene-containing boronate macrocycles: preparation, characterization and functionalization
摘要： Formation of emissive nanoparticles from tetraphenylethylene-containing boronate macrocycles: preparation, characterization and functionalization. [2+2] Macrocycles composed of two tetraphenylethylenes (TPEs) and two linkers, namely 1a (R = H) and 1b (R = NO2), were prepared in a facile manner through the one-pot dehydration of gem-di(boronic acid)-appended TPEs 2a (R = H) and 2b (R = NO2) with di(trimethylolpropane) 3 in MeOH. Considering that use of THF instead of MeOH as the reaction solvent gave a mixture of boronate esters, hydrophobicity-induced non-covalent interactions involving mono(boronate ester) intermediates produced by the dehydration of 2 and 3, may be responsible for the selective cyclization in MeOH. We found that these boronate macrocycles formed emissive nanoparticles of 1a (λem = 483 nm, λex = 365 nm, ΦF = 31%) and 1b (λem = 539 nm, λex = 365 nm, ΦF = 11%) in H2O, with average diameters of 312 ± 44.6 nm and 146 ± 25.5 nm, respectively. The dynamic features of these particles endow them with reversible thermoresponsive properties; indeed, emissiveness responded linearly to temperature over the tested range. The hysteresis-free temperature sensitivity (S) of the 1a-based nanoparticles was determined to be 0.75% K?1 in H2O. Such behavior was rationalized by dynamic light scattering (DLS) experiments, which facilitated the detection of particle-size changes in response to temperature. As a control, bis(pinacolboryl)-appended TPE 6, which does not form nanoparticles in H2O, was poorly responsive to changes in temperature. Furthermore, effective emission quenching was observed upon addition of 2,6-dichloro-4-nitroaniline (DCN), a toxic pesticide, at a detection limit of 2.00 ppm in H2O/MeOH (3 : 2 v/v). Although DCN-induced quenching is ascribable to the nature of the TPE units, the self-assembled nanoparticle morphologies were altered upon addition of DCN, as determined by DLS and field-emission scanning electron microscopy (FE-SEM), and appeared to involve an Ostwald ripening process.
关键词： boronate macrocycles,tetraphenylethylene,thermoresponsive,nanoparticles,aggregation-induced emission,chemosensor
更新于2025-09-19 17:15:36