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• W2058817590 endingPage "21585" @default.
• W2058817590 startingPage "21576" @default.
• W2058817590 abstract "We have prepared novel room temperature ionic liquids (RTILs) with trimethylsilylmethyl (TMSiM)-substituted imidazolium cations and compared the properties of these liquids with those for which the TMSiM group is replaced by the analogous neopentyl group. The ionic liquids are prepared with both tetrafluoroborate (BF4-) and bis(trifluoromethylsulfonyl)imide (NTf2-) anions paired with the imidazolium cations. At 22 °C, the TMSiM-substituted imidazolium ILs have shear viscosities that are reduced by a factor of 1.6 and 7.4 relative to the alkylimidazolium ILs for the NTf2- and BF4- anions, respectively. To understand the effect of silicon substitution on the viscosity, the charge densities have been calculated by using density functional theory electronic structure calculations. The ultrafast intermolecular, vibrational, and orientational dynamics of these RTILs have been measured by using femtosecond optical heterodyne-detected Raman-induced Kerr effect spectroscopy (OHD-RIKES). The intermolecular dynamical spectrum provides an estimate of the strength of interactions between the ions in the RTILs, and provides a qualitative explanation for the observed reduction in viscosity for the silicon-substituted RTILs." @default.
• W2058817590 created "2016-06-24" @default.
• W2058817590 creator A5032749422 @default.
• W2058817590 creator A5036301051 @default.
• W2058817590 date "2005-10-20" @default.
• W2058817590 modified "2023-10-16" @default.
• W2058817590 title "Why Are Viscosities Lower for Ionic Liquids with −CH₂Si(CH₃)₃ vs −CH₂C(CH₃)₃ Substitutions on the Imidazolium Cations?" @default.
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• W2058817590 doi "https://doi.org/10.1021/jp053930j" @default.
• W2058817590 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16853801" @default.
• W2058817590 hasPublicationYear "2005" @default.
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