TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation (Claimed): Perfluoroalkane sulfonamide compound is made by preparing perfluoroalkane sulfoamide containing compound of structure Rf-SO2-N--CF3 M+, preparing organic or inorganic cations of structure Y+(-B), and reacting above two components to produce perfluoroalkane sulfonamide compound of structure Rf-SO2-N--CF3 Y+. Preferred Methods: The first component is prepared by reacting sulfoamide containing compound of structure RfSO2N=CX2 or RfSO2N(CN) (SiR1R2R3) with metal fluoride of structure M+F or by reacting (RfSO2NH)- (M+) with cyanogen halide in the presence of carbonate containing compound of structure ((M2+))2 CO32- or (M2+)HCO3.R1-R3=1-4C alkyl;X=halo atomsThe method includes reacting sulfoamide containing compound with metal fluoride to obtain a product containing first compound; making an acid act on product to produce perfluoroalkane sulfonamide compound of structure Rf-SO2-NH-CF3; preparing sulfoamide containing compound of structure RfSO2N=CX2 by reacting sulfoamide carboxy containing compound of structure RfSO2NCO. The sulfoamide containing compound of structure RfSO2N(CN) (SiR1R2R3) is prepared by reacting (RfSO2N(SiR1R2R3))-M+ with cyanogen halide. Preferred Components: The metal fluoride is preferably silver fluoride.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The organic ammonium cation is ammonium cation with four mutually independent aliphatic group or ammonium cation with four aliphatic group greater than or equal to 2 of which are linked together. Preferred Definitions:    M+=silver cation;    -B=halide ion;    Rf=trifluoromethyl group or a pentafluoroethyl group;and    Y+=organic ammonium cation, preferably optionally substituted imidazolium cation or 1-ethyl-3-methylimidazolium (preferred), 1-ethyl-2,3-dimethyl imidazolium or tetrabutyl ammonium.    EXAMPLE - (CF3SO2NCF3)-Ag+ was synthesized by weighing silver fluoride (16.9 g) and dry acetonitrile (40 ml) into flask equipped with a tube of calcium chloride. The flask was immersed in an ice water bath, and while stirring the contents, a solution of the CF3SO2N--CC12 (8.49 g) and dry acetonitrile (20 ml) was instilled in. As a result, an exothermic reaction took place. After this exothermic reaction had died down, the liquid reaction mixture was heated and refluxed for 2.5 hours. After the reaction was completed, the reaction liquid was allowed to cool down to room temperature, and then the silver chloride (solid) produced was filtered off from the reaction liquid. The solvent was then distilled off from the filtrate. A large amount of diethyl ether was added to the residue thus obtained, and the insoluble component was filtered off. The solvent was then distilled off from the filtrate, and drying was carried out under reduced pressure at room temperature. In this way liquid product (11.98 g) was obtained. The yield was quantitative. In addition to the target substance (CF3SO2NCF3)- Ag+, the product contained solver hexafluorophosphide (AgPF6) in a small amount. The AgPF6 was removed using the following method. Diisopropyl ether (150 ml) was added to the product, thus dissolving the (CF3SO2NCF3)-Ag+. The solution was left in a refrigerator and the insoluble component was filtered off. The solvent was then distilled off from the filtrate, and thorough drying was carried out using a vacuum pump. In this way, it was possible to obtain the target substance ((CF3SO2NCF3)-Ag+) in the form of a liquid containing only a trace amount of AgPF6. The yield was 11.31 g (95%).