perfluorooctanyl side chain (EDOTF) was custom-synthesized from hydroxymethyl
EDOT (95%) and pentadecafluorooctanoyl chloride (97%) obtained from
Sigma-Aldrich. High-molecular-weight PVC (HMW PVC), bis(2-ethylhexyl)
sebacate (DOS), potassium ionophore I (valinomycin), and tetrahydrofuran
(THF), all Selectophore grade, and anhydrous acetonitrile (ACN; 99.5%)
were purchased from Sigma-Aldrich. KTFAB (97%;
Suprapur grade) was received from Merck Millipore. All aqueous solutions
were prepared from deionized water (DIW) with a resistivity of 18.2
MΩ cm (ELGA).