TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The ionic liquid includes anion that is a counter ion to the compound of (1). The anion comprises carbon fluoride-containing ion of (CF3SO3-, CF3CH2SO3-, CF3COO-, or preferably CF3SO2)2N-; phosphorus hexafluoride ion (PF6-); boron tetrafluoride (BF4-); antimony hexafluoride (SbF6-); carbon nitrogen-containing ion (CN)2N-; sulfate ion (SO42-; hydrogen sulfate ion (HSO4-), nitrate ion (NO3-), fluoride (F-), chloride (Cl-), bromide (Br-) and/or iodide (I-).Preferred Process: After the reaction step, the anion (Q) of the salt of formula (3) and a compound AB are subjected to anion exchange through the reaction scheme (I) to produce the ionic liquid. The process may involve reacting together an organic ester of formula R5'W and a compound of (2) while stirring at 20-100degreesC to produce a salt of formula (5).AB = LiN(CF3SO2)2, NaN(CF3SO2)2, KN(CF3SO2)2, CF3SO3Li, CF3SO3Na, CF3SO3K, CF3CH2SO3Li, CF3CH2SO3Na, CF3CH2SO3K, CF3COOLi, CF3COONa, CF3COOK, LiPF6, NaPF6, KPF6, LiBF4, NaBF4, KBF4, LiSbF6, NaSbF6, KSbF6, NaN(CN)2, AgN(CN)2, Na2SO4, K2SO4, NaNO or KNO3;R5' = dialkyl sulfate ester, dialkyl sulfonate ester, dialkyl carbonate ester, trialkyl phosphate ester, alkyl monofluoroalkylsulfonate, alkyl polyfluoroalkylsulfonate or alkyl perfluorocarbonate;Q = halogen. Preferred Definitions:    R1-R4 (in formula (1)) = 1-5C alkyl, preferably methyl;    R5 (in formula (1)) = 1-5C alkyl, preferably ethyl or propyl;    X, Y = N;    Z = S.    EXAMPLE - Bis(dimethylamino)ethylthiomethylium iodide (21.1 g) was dissolved in pure water (300 mL), and the resulting solution was added to an aqueous solution of lithium bis(trifluoromethanesulfonyl) imide (21 g) in pure water (50 mL), and stirring was carried out for 60 minutes to obtain a hydrophobic colorless transparent liquid. The hydrophobic liquid was washed several times with pure water, and extraction was carried out with dichloromethane. The extract was concentrated, and vacuum dried for 10 hours at 80 degrees C to give colorless transparent liquid (31.6 g, yield 98 %) at room temperature. The compound was bis(dimethylamino)ethylthiomethylium bis(trifluoromethanesulfonyl)imide and evaluated. A glass transition temperature of -81.2 degrees C was exhibited, but a peak corresponding to the melting point was not observed. The liquid state was maintained even after leaving for 1 week at a low temperature of -30 degrees C. The weight loss onset temperature when measured with a heating rate of 10 degrees C/min was 273 degrees C. The salt had maintained a stable liquid state at below -30-273 degrees C and conductivity of 0.4 Sm-1 at 25 degrees C.