A double-chain ammonium amphiphile with the p-nitroaniline moiety formed ordered bilayer assemblies in ethanol media. p-Toluenesulfonate counterion effectively stabilized the bilayer. Excitonic interaction among highly oriented chromophores at the bilayer surface was probed by absorption and circular dichroism spectra.
The calix[4]arene-mediated transport of alkali ions across black lipid membranes (BLM) of synthetic amphiphiles was examined by the charge pulse relaxation technique. Double-chain amphiphiles with cationic, anionic and nonionic head groups formed stable BLM’s, and the transport parameters for alkali ions were determined. The calix[4]arene derivative displayed an enhanced transport rate for Na+ ion across the synthetic BLM’s, while the relative adsorption/desorption rate (β) of alkali ions was significantly affected by the surface charge of the BLM’s.
Transport of alkali-ions across black lipid membranes (BLM) formed from cationic and anionic, double-chain amphiphiles was characterized by the charge pulse relaxation technique. Amphiphiles containing an ether linkage in the alkyl tail portion displayed enhanced transport rates for sodium and potassium ions, while such selectivity is not observed for the related amphiphile without the ether linkage.
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