Ionic Diode and Molecular Pump Phenomena Associated with Caffeic Acid Accumulated into an Intrinsically Microporous Polyamine (PIM?EA?TB)

The polymer of intrinsic microporosity PIM-EA-TB provides a molecularly rigid micropore structure containing tertiary amine sites and is shown here to interact with hydrogen bonding guest molecules such as caffeic acid. Voltammetric data film on glassy carbon electrodes show that in both acidic solution (pH 2; protonated) neutral 6; not acid slowly accumulated into the microporous host. Binding constants are estimated suggested be linked causing accumulation When employing an asymmetric membrane coated onto 5 ?m thick Teflon support 10 diameter microholes (using either single microhole or 10×10 array microholes), binding cause modulation ionic current without affecting pH-dependent diode behaviour. Two complementary types effects guests discussed based blocking anion diffusion pathways removal positive charges. transport mechanism/efficiency investigated view selective molecular pumping.