title: Properties of ionic liquids containing silver(I) or protic alkylethylenediamine cations with a bis(trifluoromethanesulfonyl)amide anion.
abstract: Ionic liquids of an N-alkylethylenediamine-silver(I) complex cation (alkyl=hexyl, 2-ethylhexyl, and octyl) or a protic N-alkylethylenediaminium cation (alkyl=butyl, hexyl, 2-ethylhexyl, octyl, decyl, and dodecyl) with a bis(trifluoromethanesulfonyl)amide counter anion (Ag-ILs and PILs, respectively) were prepared and their physicochemical properties were investigated. The trend of solidification decreased in the order octyl≫hexyl>2-ethylhexyl for the Ag-ILs, and butyl>dodecyl>decyl>octyl>hexyl≫2-ethylhexyl for the PILs. The diffusion coefficients of the cations indicated stronger intermolecular interactions in PILs than in the Ag-ILs because of hydrogen-bonding networks, and it has been revealed that the intermolecular interactions increase in the order, hexyl<octyl<2-ethylhexyl for the Ag-ILs, and hexyl≈2-ethylhexyl<butyl≈octyl<decyl≈dodecyl for the PILs. The ionicity of the PILs was nearly independent (0.38-0.43) of the lengths of the alkyl chain. The octyl Ag-IL provided uniform silver(0) nanoparticles upon reaction with aqueous NaBH(4) solution, whereas the 2-ethylhexyl and hexyl complexes did not form silver(0) sols. This difference can be attributed to the ordering of the nanostructures in the Ag-ILs.
authors.affiliation: Division of Material Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara, Japan. iida@cc.nara-wu.ac.jp
authors.forename: Masayasu
authors.initials: M
authors.lastname: Iida
authors.forename: Sayaka
authors.initials: S
authors.lastname: Kawakami
authors.forename: Emi
authors.initials: E
authors.lastname: Syouno
authors.forename: Hua
authors.initials: H
authors.lastname: Er
authors.forename: Eiji
authors.initials: E
authors.lastname: Taguchi