Bis trifluoromethanesulfonyl methyl

Properties. l-[Bis(trifluoromethanesulfonyl)methyl]-2,3,4,5, 6-pentafluorobenzene (1) is one of the strongest Brdnsted acids. Its pifa value in CD3CO2D is 1.5 as measured by the NMR method. It is stronger than sulfuric acid, which has a VK value of 7.0 as measured by the same method. 

Hewlett, P. C., Brack, N., Hollenkamp, A. E, Forsyth, M., and MacFarlane, D. R., Characterization of the lithium surface in N-methyl-N-alkylpyrrolidinium bis(trifluoromethanesulfonyl)imide room-temperature ionic liquid electrolytes, /. Electrochem. Soc., 153, A595-A606,2006. 

Castriota, M., Caruso, T., Agostino, R. G., Cazzanelli, E., Henderson, W. A., and Passerini, S., Raman investigation of the ionic liquid N-methyl-N-propylpyr-rolidinium bis(trifluoromethanesulfonyl)imide and its mixture with LiN (S02Cp3)2, /. Phys. Chem. A, 109,92-96,2005. 

Fujimori, T., Fujii, K., Kanzaki, R., Chiba, K., Yamamoto, H., Umebayashi, Y, and Ishiguro, S.-L, Conformational structure of room temperature ionic liquid N-butyl-N-methyl-pyrrolidinium bis(trifluoromethanesulfonyl)imide - Raman spectroscopic study and DPT calculations, /. Mol. Liquids, 131-132,216-224,2007. 

A similar principle is applied in dispersion polymerization in ionic liquids produced particles are in sub-micron range (41,42). The monomer, initiator and colloidal stabilizer are soluble in the liquid medium, but the obtained polymer is not. Different kinds of ionic liquids may be used, such as for styrene l-butyl-3-methylimidazolium tetrafluoroborate or N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis(trifluoromethanesulfonyl)imide. In general, radical polymerization in ionic liquids provides higher polymerization rate and higher molecular weights than the process in bulk or organic solvents (homogenous system). 

TABLE 27.2. Values of Conductivity (c), ESW, Melting Points with ILs in the Limit, Formula Weight and Density of V-Butyl-iV-Methyl Pyrrolidinium (PYRj4-l-) and V-Methoxyethyl-V-Methylpyrrolidinium (PYRj 2 y-l-)-Based ILs with Bis (trifluoromethanesulfonyl)imide (TFSI—) and Trifluoromethane Sulfonate (Tf—) Anions... 

Relatively little work has been published on Type II supercapacitors. Arbizzani et al. [147] have prepared PPy/poly(3-methylthiophene) devices performance was similar to their PPy-based Type I device and to carbon supercapacitors. Clemente et al. [163] prepared PPy/PANI devices with specific capacitance values as high as 25 F/g, depending on electrolyte composition. Stenger-Smith et al. [37] prepared poly(3,4-ethylenedioxythiophene) (PEDOT, Figure 9.4J)/poly(3,4-propylenedioxythiophene) (PProDOT, Figure 9.4L) Type II supercapacitors. Switching speed and cycle life were found to depend heavily on electrolyte composition, with only 2% loss in capacity over 50,000 full cycles when 1-ethyl-3- methyl-IH-imidazolium bis(trifluoromethanesulfonyl)imide (EMI-BTI) was used as the electrolyte. 

Sakaebe H. Matsumoto, H., N-Methyl-N-propylpiperidinium bis(trifluoromethanesulfonyl) imide (PP13-TFS1) - novel electrolyte base for Li battery, Electrochem. Commun., 2003, 5, 594-598. 

Dai et al. further demonstrated the potential application of PAFs in the electrochemical field. By the melting diffusion of sulfur into the framework of JUC-Z2, PAF-S was obtained with sulfur highly dispersed inside JUC-Z2. As a cathode material, the PAF-S composite shovt 1083 mA g reversible capacity and excellent stability in 1.0 M LiPFg-MiPS. In the ion liquid electrolyte N-methyl-N-propyl pyrrolidinium bis-(trifluoromethanesulfonyl)imide (MPPY TFSI), an 830 mA h g reversible capacity is achieved and 83% is retained after 50 cycles (Figure 8.7). The authors pointed out that once sulfur is loaded into the aromatic framework, the poor cycle stability of the sulfur electrode can be partially mitigated because of the confinement effect of the porous framework. Though the electronic conductivity of PAFs is low, this research does demonstrate the potential application of PAFs in batteries. 

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