The evaporation study of silicon-containing ionic liquid.

1,2-Dimethyl-3-(1′,1′,3′,3′-tetramethyl-3′-phenyldisiloxanyl)methylimidazolium bis(trifluoromethanesulfonyl)amide ([PhC 5 OSi 2 MMIm + ][Tf 2 N − ]) is the first silicon-containing ionic liquid which was characterized with the vaporization enthalpy, (138.5 ± 1.8) kJ mol −1 , and saturated vapor pressure, ln( p / Pa ) = −(16656 ± 219)/( T / K ) + (30.69 ± 0.92). This compound is a unique ionic liquid giving ions, retaining both cationic and anionic portions, in the electron impact ionization (EI) mass spectrum. [ABSTRACT FROM AUTHOR]