Calix[4]pyrroles were applied as a new class of ligands of potentiometric sensors for neutral nitrophenol isomers. Calix[4]pyrrole-containing liquid membranes exhibit a very high affinity to proton uptake. These membranes, in protonated form, showed very high selectivity towards para-nitrophenol in the presence of other nitrophenols and dihydroxybenzene isomers. The probable mechanism of the potentiometric signal generation of the membrane investigated upon stimulation by nitrophenol isomers existing in neutral form is discussed.
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Piotrowski et al. (2001) studied this question.
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