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C4mim is a shorthand for the 1-butyl-3-methylimidazolium cation; where C4 refers to the butyl group. It is also abbreviated Bmim, and (rarely) Bumim. Salts containing this imidazole cation are ionic liquids. A common example of such is [C4mim][Cl], or 1-butyl-3-methylimidazolium chloride. Other examples include BMIM-PF6, [Bmim]BF4, and C4mim-FeCl4, the latter of which is a magnetic ionic liquid.
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