Abstract
A new series of ionic liquids have been synthesized from biorelated compounds and their characteristics have been analyzed. Amino acid ionic liquids (AAILs), which contain amino acids as the anions, enable us to study the effect of substituent groups on the properties of ionic liquids. The mixing of different AAILs improved the polarity of the AAILs. This is attributable to interactions between the amino acids. Chiral amino acid derived cations have also been synthesized via regio-specific alkylation of histidine. These prepared imidazolium cations were mixed with lithium bis(trifluoromethane sulfonyl)imide (LiTf2N) to construct lithium cation conductor. Equimolar mixture of these gave an ionic conductivity of about 1 x 10-4 Scm-1 at 50 °C. Mixture of zwitterions with LiTf2N provided effective dissociation of lithium ion in the mixture. Ionic liquids composed of choline and amino acids were newly prepared. Those AAILs with alanine or serine showed glass transition temperature at -53 °C, and -46 °C, respectively.
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