1262336-92-4Relevant articles and documents
Calix[4]amido crown functionalized visible sensors for cyanide and iodide anions
Choudhary, Ganpat,Malik, Apoorva,Pandey, Shubham,Sharma, Pragati R.,Sharma, Rakesh K.,Soni, Vineet K.
, p. 26644 - 26654 (2021/08/16)
This study comprises the design and development of calix[4] arene-amido-based ionophoresby varying structural stringency and steric hindrance at the lower rim to probe the anion sensing properties. The ionophores are prepared, purified, and characterized using various analytical techniques. The molecular structure of the most active ionophoreIis established by single-crystal X-ray characterisation. Out of various anions investigated, iodide and cyanide show the highest sensitivity towards the ionophores investigated. Both anions are sensitive enough to give a visibly distinct color change. The binding properties of the ionophores are established with1H &127I NMR, fluorescence, and UV-vis spectroscopy, revealing that three ionophores strongly interact with CN?and I?. The binding constants are calculatedviaBenesi-Hildebrand plots using absorption data. The time-dependent1H NMR revealed strong hydrogen bonding between the OH and NH groups of the ionophore and cyanide anion. The127I NMR shows the highest 27.6 ppm shift after 6 h for ionophoreI. The crystal structure revealed hydrogen bonding of N-H protons of the amide pendulum and phenolic oxygen of the calix rim. The Job's plot depicted the possibility of a 1?:?1 complex of ionophores with both anions.
Fabrication of a Tyrosine-Responsive Liquid Quantum Dots Based Biosensor through Host-Guest Chemistry
Lu, Xiaoju,Zhan, Yibei,Ouyang, Qingying,Bai, Suya,Chen, Huan,Yu, Yongliang,Zheng, Yifu,Sun, Yao,Li, Haibing
, p. 13285 - 13289 (2019/10/11)
Design and fabrication of smart liquid quantum dots (LQDs) with high biomolecule selectivity and specificity remains a challenge. Herein, a multifunctional calix[4]arene derivative (PCAD) was rationally designed and applied to fabricate a Tyr-responsive CdSe-LQD system through host-guest chemistry. Such a biosensor displays an outstanding fluorescence/macroscopic response for Tyr and reversible fluidic features due to the hydrogen interaction between the PCAD of CdSe-LQDs and Tyr. These excellent results highlighted CdSe-LQDs as a promising platform for biological molecule recognition and separation in the future.
N -Alkyl calix[4]azacrowns for the selective extraction of uranium
Wehbie, Moheddine,Arrachart, Guilhem,Le Goff, Xavier F.,Karamé, Iyad,Pellet-Rostaing, Stéphane
, p. 14594 - 14603 (2018/10/31)
The selective extraction of uranium by N-octylcalix[4]azacrown (NOCAC) and N-ethylhexylcalix[4]azacrown (NEHCAC) was investigated. The ligands were synthesised in three steps through the functionalisation of t-butyl calix[4]arene at the distal-1,3-positions of the lower rim with ethyl acetate groups followed by cyclisation with (imino)bis(ethane-2,1-diyl)diamide. A detailed investigation on the effect of various parameters, such as the aqueous phase acidity (sulfuric acid), the ionic strength, and ligand concentration, on the extraction of uranium(vi) has been conducted. The effect of the H2SO4 concentration has been studied from 0.02 to 3 M. Preliminary studies carried out on NOCAC in dodecane/octanol diluents showed that the uranium extraction from sulfuric acid is more efficient at a low H2SO4 concentrations. The stoichiometry of complexation was estimated from the slope method, NMR titration, and electrospray ionisation-mass spectrometry analysis. Both ligands were found to be highly selective for uranium(vi) over other competitive cations present in a simulated leach solution containing seven competitive cations. The successful recovery of the uranium from the organic phase has been performed thanks to stripping steps involving ammonium oxalate, ammonium carbonate, and sodium carbonate as stripping agents.
