Abstract
Intensive research is focused on organoboron receptors characterized by strong and selective interactions of three-coordinate boron center (hard Lewis acid) with fluoride ions (hard Lewis base). In this work, newly syntesized 4-octyloxyphenylboronic acid (OPBA) and pinacol ester of 2,4,6trifluorophenylboronic acid (PE-PBA) were proposed as fluoride-selective ionophores in polymer membranes. The membranes containing OPBA showed enhanced selectivity, but the slopes of the fluoride responses in acidic conditions were super-Nernstian. In contrary, theoretical behavior was noticed in the case of membranes doped with the pinacol ester derivative. A response mechanism of the polymer membrane electrodes based on organoboron receptors was proposed on the basis of potentiometric and 19F NMR studies.
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