Journal of the American Chemical Society p. 63 - 66 (1985)
Update date:2022-08-02
Topics:
Izatt, Steven R.
Hawkins, Richard T.
Christensen, James J.
Izatt, Reed M.
Several new p-tert-pentylcalixarenes have been synthesized.These and other calixarenes have been used to study carrier-mediated alkali-metal cation fluxes at 25 deg C in H2O-(organic solvent)-H2O liquid membranes.In addition to single cation systems, all possible equimolar, two-, three-, and four-cation mixtures of NaOH, KOH, RbOH, and CsOH were used in the study.In each case, alkali cation transport was coupled with the reverse flux of protons.Selective transport of Cs(1+) over Rb(1+), K(1+), and Na(1+) was seen in all mixtures studied.The greatest selectivity for Cs(1+) was found for calix<4>arenes, but the largest flux of Cs(1+) as well as the other alkali cations was seen with the calix<6>arenes and calix<8>arenes.The greater flux in these latter cases may be a result of each calixarene binding two cations.In experiments at low
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