tert -Octylcalix(8)arene and derivatives in which the lower rim hydroxy groups have been converted into OCH 2 CO 2 Et and OCH 2 COCH 3 groups have been shown to form Langmuir−Blodgett films readily. These films adsorb a range of anions and cations from solution. XPS determinations on the films identify both the nucleus and the extent of adsorption into the films. For anions the order of selection is I > F > Br > Cl and for cations is Cs > Rb > Na ≫ K. Such films clearly have potential applications in ion sensing.
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Davis et al. (1996) studied this question.
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