The specific interaction of N-tetradecylisoquinolinium (C 14Iq+) with Cl- and Br- has been detected in the voltammetry of ion transfer and electrocapillarity at the interface between an aqueous solution (W) and a room-temperature ionic liquid (RTIL), N-tetradecylisoquinolinium bis(pentafluoroethylsulfonyl)imide ([C 14Iq+][C2C2N-]). This specific interaction also makes the transfer of Cl- and Br - into [C14lq+][C2C 2N-] energetically more favorable in comparison with that of F- and SO42-. The width of the polarized potential window in ion-transfer voltammetry at the [C14Iq +][C2C2N-]|W interface is significantly narrower because of the transfer of anions from W to RTIL. The degree of affinity of the anion with C14Iq+ agrees with the Hofmeister series. Such an ion-pair formation of anions in W wth cations in the RTIL is much weaker when the cation constituting the RTIL is a symmetric tetraheptylammonium ion.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Surfaces and Interfaces