Enhanced fluorescence quenching forp-nitrophenol in imidazolium ionic liquids using a europium-based fluorescent probe

Abstract

The chemosensing of p-nitrophenol has been carried out in different solvents using a europium-based fluorescent probe and enhanced quenching efficiency was obtained in imidazolium ionic liquids compared to in water.

Design and Preparation of Ethylene Fluorescence Probes Based on Arylolefins and Grubbs Catalysts

“…To circumvent this predicament, the principle of photoluminescence comes into play. By harnessing the photoluminescence characteristics of the material, the preprocessing step of the detected sample can be simplified, and the sample can be directly detected. , In recent years, the fluorescence probe method based on the principle of photoluminescence has garnered the interest of researchers. , These fluorescent probes boast of being economical, convenient, speedy, and adept at preserving the freshness and texture of fruits . Fluorescent probes are substances that convert chemical information about intermolecular interactions into an effect on the fluorescent signal, thus enabling the recognition of specific molecules or ions.…”

“…It is important to note that the development of simple and efficient fluorescent probes for ethylene detection can greatly benefit the transportation and storage of fruits, as well as provide more opportunities for fluorescence imaging of endogenous ethylene in plants. The characterization of the structure of the probes using FT-IR spectroscopy, HRMS, and 1 H NMR, 13 C NMR, and 31 P NMR spectroscopies, along with the testing of their ethylene response properties using UV−visible and fluorescence spectrophotometers, are crucial steps in the develop-ment of these probes. The monitoring of the ripening process of yellow tomatoes using these probes can provide valuable insights into the practical application of these probes in the agricultural industry.…”

“…1 H NMR (600 MHz, Chloroform-d): δ 8.39 (s, 1H), 8.23−8.15 (m, 4H), 8.12 (d, J = 9.2 Hz, 1H), 8.05 (s, 2H), 8.00 (t, J = 7.6 Hz, 1H), 7.80 (dd, J = 17.3, 11.0 Hz, 1H), 6.00 (dd, J = 17.3, 1.1 Hz, 1H), 5.62 (dd, J = 11.0, 1.2 Hz, 1H). 13 C NMR (151 MHz, Chloroform-d): δ 134. 13, 132.28, 131.38, 130.80, 128.01, 127.48, 127.35, 127.19, 125.86, 125.16, 124.93, 123.60, 122.94, 117.14. 1-Vinylpyrene (100 mg, 0.4 mmol) was added into a dichloromethane (CH 2 Cl 2 ) (10 mL) solution containing G−1 (36 mg, 0.04 mmol) at room temperature, and the color of that solution changed from purple to yellow immediately.…”

“…The spectrum range was from 700 to 3200 cm −1 at a resolution of 4 cm −1 . 1 H, 13 C, and 31 P nuclear magnetic resonance (NMR) spectroscopies (Ascend 600 MHz, Bruker, Germany) were also used to characterize the structure of the compounds. It mainly determines the structure of the compound by measuring the number and distribution of hydrogen atoms at each peak position.…”

“…Deuterated chloroform (CDCl 3 ) was used as the solvent. 13 C NMR spectroscopy is an analytical technique that analyzes nuclear magnetic resonance signals containing carbon by measuring them and making judgments about the structure based on their intensity. 31 P NMR spectroscopy allows accurate detection of changes in phosphorus-containing compounds in chemical reactions and enables monitoring of synthetic reaction processes.…”