Alkali Metal Cation Recognition at an Air-Water Interface by Lipophilic Double-Armed Crown Ethers
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چکیده
منابع مشابه
Dansyl - Substituted Aza Crown Ethers: Complexation with Alkali, Alkaline Earth Metal Ions and Ammonium.
The present study investigates the binding properties of four dansyl substituted aza-crown ethers with alkali, alkaline earth metal ions and ammonium. The influence of the solvent polarity and protonation on the photophysical properties of the compounds was studied by UV/Vis and fluorescence methods. The host species caused only slight changes on the absorption spectra of the ligands. The fluor...
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Tran Doan Huan,1,* Maximilian Amsler,1 Riccardo Sabatini,2 Vu Ngoc Tuoc,3 Nam Ba Le,3,4 Lilia M. Woods,4 Nicola Marzari,2 and Stefan Goedecker1,† 1Department of Physics, Universität Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland 2Theory and Simulation of Materials, École Polytechnique Fédérale de Lausanne, Station 12, 1015 Lausanne, Switzerland 3Institute of Engineering Physics, Hanoi Un...
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Crown ethers have the remarkable property of recognizing and binding specific metal cations in complex mixtures. We propose to combine molecular recognition with molecular electric conductance. The question we address is: can the event of binding a cation be sensed by a change in conductance? Specifically, we study a short molecular wire (MW) containing a crown-6 molecule connected via sulfur a...
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Sixteen lipophilic N-(X)sulfonyl carbamoyl lariat ethers with polyether ring sizes of 12-crown-4, 14-crown-4, 15-crown-5, and 18-crown-6 are utilized for competitive alkali metal cation extractions from aqueous solutions into chloroform. Variation of the electron-withdrawing properties of X in the series of methyl, phenyl, 4-nitrophenyl, and trifluoromethyl allows the influence of the acidity o...
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Direct spectroscopic evidence of the presence of organic phenolate ions at the air/aqueous interface has been established using the nonlinear spectroscopic technique of vibrational sum frequency generation (SFG). By probing the phenol C–OH and the phenolate C–O vibrational stretches, which occur in the range of 1200–1300 cm and are distinguishable, we have succeeded in determining the identitie...
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ژورنال
عنوان ژورنال: Journal of Japan Oil Chemists' Society
سال: 1997
ISSN: 1341-8327,1884-1996
DOI: 10.5650/jos1996.46.931