Melting and Crystallization Behaviors of Alkali Metal (Fluorosulfonyl)(trifluoromethylsulfonyl)amides

Abstract Asymmetric perfluoroamides with Li+ and Rb+ exhibited unusual phase transition behaviors such as very slow crystallization and a large shift in melting point of the melt-crystallized salts, which have not been reported in alkali metal salts so far. Considering that corresponding symmetric amides do not exhibit such unique phenomena, the structural asymmetry in anions serves an important role in these phase-transition behaviors.