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Fluorescent Calixarene Scaffolds for NO Detection in Protic Media
摘要： Here, we present the first fluorescent water-soluble conjugated calixarene scaffolds that are capable of detection of NO gas. Two different scaffolds, one based on a 5,5’-Bicalixarene structure and its isomer bearing two distantly conjugated calixarene moieties, have been synthesized. While the fluorescence of both isomers is quenched upon either passing of NO gas or generating it in-situ from diethylamine NONOate, the bicalixarene-based scaffold showed a significantly stronger response. We also present an example of a dye encapsulation strategy to achieve the detection of NO at longer wavelengths than in the parent calixarene host. Finally, a conjugated polymer bearing 5,5’-Bicalixarene scaffold has also been prepared and demonstrated enhanced sensitivity compared with the monomer due to the molecular wire effect.
关键词： conjugated systems,nitric oxide,host-guest chemistry,fluorescent probes,Calixarene
更新于2025-09-23 15:22:29
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Fabrication of thin films of phosphonated calix[4]arene bearing crown ether and their gas sensing properties
摘要： Calix[4]arenes bearing phosphate and crown ether groups are shown to hold considerable promise as the active layer in volatile organic compound (VOC) vapor sensor. Its chemical sensing selectivity and sensitivity can be altered by different alkyl side chains. These organic architectures were successfully deposited by spin coating method on gold-coated glass surfaces. Surface Plasmon Resonance (SPR) technique was used for VOCs detection to evaluate the chemical-sensing properties of these calix[4]arene derivatives. Spun thin films of calix[4]arene derivatives were exposed to a variety of VOC vapors, and the resonance angles changes of these films were recorded for the specific analyte vapors such as chloroform, carbon tetrachloride, dichloromethane, ethanol, benzene, and toluene. Measurements were made at room temperature, and the responses were found to be fast and appeared to be completely reversible. The sensing results showed similar response patterns, and our data strongly indicate that response of used thin films of calix[4]arene derivatives to chloroform is much higher than those of any other VOCs used with the values of 0.47×10-3, 1.042×10-3 and 1.952×10-3 (% / ppm) for the compounds 1, 2 and 3 respectively. Furthermore, gas sensing interaction mechanisms of the thin films were evaluated in terms of the molar volumes, dipole moments and refractive indexes of the analyzed gas molecules.
关键词： Calixarene,SPR,thin film,gas sensing
更新于2025-09-10 09:29:36