title: Intermolecular interactions and dynamics of room temperature ionic liquids that have silyl- and siloxy-substituted imidazolium cations.
abstract: The intermolecular interactions and dynamics of novel ionic liquids with alkylsilyl and alkylsiloxy substitutions on the cations are studied by measuring the intermolecular vibrational spectra and reorientational dynamics using femtosecond Kerr effect methods. The new ionic liquids include 1-dimethylphenylsilylmethyl-3-methylimidazolium (PhSi-mim+), and 1-methyl-3-pentamethyldisiloxymethylimidazolium (SiOSi-mim+) cations paired with the bis(trifluoromethylsulfonyl)imide (NTf(2)-) anion. Measured ionic liquid viscosities are surprisingly low for such bulky cation substituents. DFT electronic structure calculations on the isolated ions provide additional information about the electrostatic interactions.
authors.affiliation: Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854-8087, USA. shirota@faculty.chiba-u.jp
authors.forename: Hideaki
authors.initials: H
authors.lastname: Shirota
authors.forename: James F
authors.initials: JF
authors.lastname: Wishart
authors.forename: Edward W
authors.initials: EW
authors.lastname: Castner
mesh_terms: D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D008956:Models, Chemical; D015394:Molecular Structure; D017646:Organosilicon Compounds / Q000737:chemistry*; D013696:Temperature; D013816:Thermodynamics; D013997:Time Factors; D014732:Vibration; D014783:Viscosity
chemical_list: D007093:Imidazoles; D052578:Ionic Liquids; D017646:Organosilicon Compounds