94517-22-3Relevant articles and documents
Novel ‘naked-eye’ Bis-Schiff base fluorescent chemosensors for sensitive detection of Zn2+ and bio-imaging in living cells
Ding, Ge,Duan, Yuanke,Li, Xiujuan,Qin, Xiaozhuan,Wang, Min,Wang, Xinchao,Zhang, Yanfen,Zhu, Guangshi
, (2020)
Novel chemosensors based on excited state intramolecular proton transfer chemosensors (F1, F3, F5) and reference dyes (F2, F4, F6) are presented in this work. Target dyes F1, F3 and F5 display high selectivity and sensitivity toward Zn2+ in solvents (such as EtOH, EtOH/PBS buffer) in the presence of competitive ions (K+, Na+, Ni2+, Pb2+, Mn2+, Mg2+, Hg2+, Cu2+,Cd2+, Cr3+, Fe3+). Sensing property for Zn2+ was studied by UV–Visible, fluorescence spectrophotometric analyses and Job's plot analyses. F1, F3 and F5 for Zn2+ detection revealed extremely low detection limit (67.2 nM), high anti-interference ability, and the immediate response. Furthermore, inverted fluorescence microscopy imaging experiment were also investigated, the results demonstrated that the probes have well cell membrane permeability and hypotoxicity. Simultaneously, due to the ability to adapt a wider range of pH, the probes could also image Zn2+ in live cells with remarkable fluorescence variation and provide a new method to visualize monitoring in live cells.
Synthesis and characterization of sulfonated polyimides containing trifluoromethyl groups as proton exchange membranes
Zhang, Qingshuang,Li, Qiaoling
experimental part, p. 1460 - 1466 (2011/11/11)
A novel sulfonated diamine, 4,4′-bis(4-amino-3- trifluoromethylphenoxy) biphenyl 3,3′-disulfonic acid (F-BAPBDS), was successfully synthesized by nucleophilic aromatic substitution of 4,4′-dihydroxybiphenyl with 2-chloro-5-nitrobenzotrifluoride, followed by reduction and sulfonation. A series of sulfonated polyimides of high molecular weight (SPI-x, x represents the molar percentage of the sulfonated monomer) were prepared by copolymerization of 1,4,5,8-naphathlenetetracarboxylic dianhydride (NTDA) with F-BAPBDS and nonsulfonated diamine. Flexible and tough membranes of high mechanical strength were obtained by solution casting and the electrolyte properties of the polymers were intensively investigated. The copolymer membranes exhibited excellent oxidative stability due to the introducing of the CF3 groups. The SPI membranes displayed desirable proton conductivity (0.52 × 10-1-0.97 × 10-1 S·cm -1) and low methanol permeability (less than 2.8 × 10 -7 cm2·s-1). The highest proton conductivity (1.89 × 10-1 S·cm-1) was obtained for the SPI-90 membrane at 80°C, with an IEC of 2.12 mequiv/g. This value is higher than that of Nafion 117 (1.7 × 10-1 S·cm-1). Furthermore, the hydrolytic stability of the obtained SPIs is better than the BDSA and ODADS based SPIs due to the hydrophobic CF3 groups which protect the imide ring from being attacked by water molecules, in spite of its strong electron-withdrawing behaviors. Copyright
