Abstract
The authors report studies of a newly synthesized cyclam deriv. with 4 chain substituents (tetra-(N-2-tetradecyl-carboxamidoethyl)-tetraazacyclotetradecane; TC14) which could be of interest for the selective liq.-liq. extn. of cations. The authors studied the monolayer properties of TC14 mols. spread at the aq. soln./air interface by surface pressure-area isotherm measurements and Brewster angle ...
Abstract
The authors report studies of a newly synthesized cyclam deriv. with 4 chain substituents (tetra-(N-2-tetradecyl-carboxamidoethyl)-tetraazacyclotetradecane; TC14) which could be of interest for the selective liq.-liq. extn. of cations. The authors studied the monolayer properties of TC14 mols. spread at the aq. soln./air interface by surface pressure-area isotherm measurements and Brewster angle microscopy. Surface pressure-area isotherms measurements were also performed at the aq. soln./decane interface with a new interfacial Langmuir trough. The effects of the salt concn. in solns. (CuCl2, NaCl and CsCl) on the TC14 surface pressure-area isotherms were related to the binding of the cations to the cage mol. at the interface. The film was sensitive to the presence of ions in the aq. phase, particularly in the high-pressure region of the isotherm, where the film collapses. The Langmuir balance technique revealed the preferential complexation of Cu2+ ions by the cage mol. in the interface and permitted one to detect the presence of very small ion concns. in the subphase.
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