N.W. Smith, et al. “Silver-Free Synthesis of Nitrate-Containing Room-Temperature Ionic Liquids,” New J. Chem., 2011, 35, 909-914

Abstract: Nitrate-containing 1-alkyl-3-methylimidazolium ionic liquids, [Cn-mim]NO3, where n = 4, 6, 8, 12, are synthesized in one step by reacting 1-methylimidazole with alkyl nitrates under various conditions without using AgNO3 and 1-alkyl-3-methylimidazolium halides