97600-39-0Relevant articles and documents
Luminescent behavior of pyrene-allied calix[4]arene for the highly pH-selective recognition and determination of Zn2+, Hg2+ and I-: Via the CHEF-PET mechanism: Computational experiment and paper-based device
Sutariya, Pinkesh G.,Soni, Heni,Gandhi, Sahaj A.,Pandya, Alok
, p. 9855 - 9864 (2019/07/04)
In this article, for the first time, we have reported a novel CHEF-PET fluorescence sensor L based on calix[4]arene containing four pyrene groups as binding sites, which is highly selective and sensitive towards Zn2+, Hg2+ and I-. This fluorescence probe was synthesized and characterized using the emission study, UV-vis titration, 1H NMR spectroscopy and ESI-MS investigation. The linear concentration range at pH 7 of L for Zn2+, Hg2+ and I- is 0-135 nM, 0-140 nM and 0-120 nM, respectively, with the detection limit of 6.43 nM for Zn2+, 2.94 nM for Hg2+ and 20.93 nM for I-. The binding ability was determined through Benesi-Hildebrand equation, which was found to be 7.535 × 108 M-1 for Zn2+, 9.001 × 108 M-1 for Hg2+ and 8.139 × 108 M-1 for I-. Further, we reported an easy-to-use, low-cost and disposable paper-based sensing device for the rapid chemical screening of Zn2+, Hg2+ and I-. The device comprises luminescent sensing probes embedded into a cellulose matrix, where the resonance energy transfer phenomenon seems to be the sensing mechanism. It opens up new opportunities for simple and fast screening in remote settings, where sophisticated instrumentation is not always available. The MOPAC-2016 software package was used to optimize the L using the well-established PM7 method and calculate the HOMO-LUMO energy band gap for structure L and L with Zn2+, Hg2+ and I- ion-based structures. The molecular docking study was carried out using HEX software.
Preparation and investigation of temperature-responsive calix[4]arene-based molecular gels
Cai, Xiuqin,Xu, Yunhua,Yang, Rong,Yang, Hui
, p. 28476 - 28482 (2017/07/07)
A novel calix[4]arene-based tetracholesteryl derivative was synthesized, and its gelation behaviours in 30 organic solvents were studied. It showed that 1 gelled long chain alkane, some of alcohol, kerosene, ethyl acetate benzene and toluene. Interestingly the gel of 1/kerosene possessed special property, which was that the mixture solution of the compound 1/kerosene heating for a while was put on the flat contact heater and formed a gel film at 25 °C and 65 °C. Unlike ordinary film, gel film had higher strength and toughness at 65 °C, by contrast other was fragile and broken easily at 25 °C, this phenomenon was few reported before. In order to explore the phenomenon, the mechanism of the gel of 1/kerosene was discussed by Scanning Electron Microscope (SEM), High Nuclear Magnetic Resonance (H NMR), Fourier Transform Infrared Spectrometer (IR) and micro-rheology. SEM revealed that the xerogel of 1/kerosene assembled network through some long and thick fibers at 65 °C, with concentration reducing fibers become thin and its networks were clearly observed. In contrast the morphology of xerogel was porous at low concentration and was a bulk at high temperature system. According to EI data in micro-rheology, the gelation process could be divided into three stages at 65 °C and they could be that some cholesterol segments in the gelator interacting with each other formed some small aggregation in the first stage, and other cholesterol section of the gelator sufficiently were cross-linked with time and assembled into large assembly in the second plateau. In the final moment the large assembly build gel network and the system of gel tended to stable. But there are two stages at low temperature and could be some cholesterol segments that didn't take part in assembly, which may be the cause that the performance of gel was fragile.
Calix[4]arene-based low molecular mass gelators to form gels in organoalkoxysilanes
Yang, Hui,Zhang, Shaofei,Liu, Kaiqiang,Fang, Yu
, p. 109969 - 109977 (2016/11/30)
Three calix[4]arene derivatives (CMA, CDA and CTA) appended with one, two or four carboxyl acid structures were prepared. Gelation behaviours of the compounds and calix[4]arene itself in ten common organoalkoxysilanes were studied. It was found that at a concentration of 2% (w/v), only the compound with the most carboxyl groups (CTA) functions as a gelator, and only this compound gels with three of the liquids tested; however, the as created gels possess smart thixotropic and thermo-reversible phase transition properties. In particular, the CTA/trimethoxyphenylsilane (PTMS) gel exhibits superior mechanical strength with a storage modulus (G′) greater than 1.9 × 106 Pa and a yield stress exceeding 3600 Pa at a concentration of 6.0% (w/v). Further testing demonstrated that the gel could be used as a substrate for sensing film fabrication, injection molding and melting-free deposition molding. Moreover, the objects from the molding and fabrication could be turned into permanent structures through further hydrolysis and condensation reactions. It is believed that the LMMGs based organoalkoxysilane gels have the potential to be used as smart materials for 3D printing and pre-cursors to a functionality-oriented solid matrix.
