Journal of Fluorescence最新文献

In this study, a series of new fluorescent compounds (1a-1e) were synthesized based on 2-phenylbenzotriazole acceptor and various diarylamine donors, and their photophysical properties in different states (solution, film, and powder) were investigated. Emissions of 1a-1e cover the spectrum from 413 nm to 572 nm in toluene solutions with various diarylamino donors on 2-phenylbenzotriazole. Among them, 1d and 1e exhibit the classical AIE properties while 1a, 1b and 1c show good emission in both solution and aggregated states. Additionally, all five compounds present large molar absorptivity (> 30000 L·mol^-1·cm^-1) and excellent emission efficiency. Thus, 2a has a molar absorptivity up to 65,800 L·mol^-1·cm^-1 in toluene, while 1a shows the emission efficiency up to 79.1%. Besides these, mechanochromic properties were observed for compounds 1a, 1d and 1e, and blue OLEDs were fabricated by using compound 1b or 1c as the active layer.

We present a new coumarin-based chemodosimeter 1 that can be easily synthesized and used as a colorimetric and fluorescence sensor for selective detection of Cu²⁺ in an aqueous solution. Chemodosimeter 1 is visual and fluorescence responses to a variety of different competing metal ions were also investigated. In an aqueous solution (DMSO/H₂O = 9/1, v/v, buffered with HEPES pH = 7.4), Chemodosimeter 1 exhibits a selective response to Cu²⁺ ions that is unique from other cations via diverse color changes and fluorescence enhancement. Chemodosimeter 1 may also be used to detect Cu²⁺ ions selectively in vitro by creating a nice image of biological organelles using live-cell imaging fluorescence microscopy studies.

Cysteine (Cys) plays a critical role in both physiological and food domains, with abnormal levels being closely linked to various diseases. Therefore, the development of highly selective and sensitive detection methods is essential. In this study, a "On-off" fluorescent probe, TPA-DNBS, based on a triphenylamine (TPA) derivative, was designed. Compared to traditional probes, TPA-OH offers greater rigidity, stronger conjugation, and a larger Stokes shift, demonstrating superior signal-to-noise ratio and detection stability in complex biological and environmental samples. The probe exhibits specific response to Cys via a photo-induced electron transfer (PET) mechanism: in the presence of Cys, the DNBS quencher group is cleaved, leading to a significant increase in fluorescence. The probe shows excellent detection performance, with a linear range from 1 × 10⁻³ M to 1 × 10⁻⁹ M and a detection limit as low as 1.05 nM, along with good selectivity, interference resistance, stability, and reproducibility. In practical sample analysis, the recovery rates of spiked Cys in milk and mineral water were 99.7%-106.6% and 102.1%-103.3%, respectively, with relative standard deviations below 2.5%. These results indicate the broad applicability of the probe in complex samples.

Employing Copper(I)-catalyzed alkyne-azide cycloaddition (CuAAC), an efficient and stereoselective technique, has led to the creation of 1,2,3-triazole derivatives notable for their capability to trace specific metal ions. In this report, a chemical sensor probe BHT based on butylated hydroxy anisole (BHA) was synthesised via CuAAC approach and characterized through spectroscopic techniques comprising Infrared Spectroscopy, Nuclear Magnetic Resonance Spectroscopy, and Mass Spectrometry. On conduction of the chemosensing analysis through UV-Visible and fluorescence spectroscopy in 80% solution of acetonitrile in water, the chemosensor probe selectively recognized Cu(II) and Fe(III) metal ions among a variety of metals tested. In addition to this, the synthesised 1,2,3-triazole based chemosensor also exhibited 'masked-sensing' of Ce(III) ions which remained obscured during the preliminary studies. The sensor probe demonstrated substantially low limits of detection for every metal ion; with the values being 4.48 µM, 3.02 µM, and 1.91 µM for Cu(II), Fe(III), and Ce(III) metal ions respectively.

A simple, cost-effective, accurate, and sensitive spectrophotometric method has been developed for the determination of fluometuron in environmental samples. The method is based on the formation of a metal complex between fluometuron and Fe(III), exhibiting maximum absorbance at 347 nm. The calibration curve followed Beer's law in the concentration range of 0.25-5.0 µg mL^- 1, with a correlation coefficient (R²) of 0.997, indicating excellent linearity. The method demonstrated a limit of detection (LOD) of 0.0787 µg mL^- 1 and a limit of quantification (LOQ) of 0.238 µg mL^- 1. Recovery studies performed on spiked environmental matrices showed high accuracy, with percent recoveries ranging from 82.12 ± 2.95% to 97.80 ± 6.11%. The developed method was successfully applied to the analysis of fluometuron in real samples, including tap water, canal water, pond water, and soil, confirming its reliability for routine environmental monitoring.