Cation transport at 25°c from binary Na+Mn+, Cs+Mn+ and Sr2+Mn+ nitrate mixtures in a H2OCHCl3H2O liquid membrane system containing a series of macrocyclic carriers

Abstract Cation fluxes from binary mixtures of either Na + , Cs + or Sr 2+ with other alkali metal cations, alkaline earth metal cations, and Pb 2+ through a H 2 OCHCl 3 H 2 O bulk liquid membrane system containing one of several macrocyclic carriers have been determined Nitrate salts were used in all cases. The most selective transport of Na + over all other cations studied was found with the carrier cryptand [2.2.1]. Selective transport of Na + relative to Li + , Cs + and the alkaline earth cations was found with cryptand [2.2.2B] and cryptand [2.2.2D]. The ligands 21-crown-7 and dibenzo-24-crown-8 showed selective transport of Cs + over the second cation in all cases. Several macrocycles showed selectivity for Sr 2+ over the second cation with the macrocycle 1,10-diaza-18-crown-6 showing the highest selectivity for this cation of all ligands studied. Relative fluxes from binary cation mixtures are rationalized in terms of macrocycle cavity size, donor atom type and ring substituents.

[1]  N. K. Dalley,et al.  4 – STRUCTURAL STUDIES OF SYNTHETIC MACROCYCLIC MOLECULES AND THEIR CATION COMPLEXES , 1978 .

[2]  J. Lehn,et al.  Cryptates. XVI. [2]-Cryptates. Stability and selectivity of alkali and alkaline-earth macrobicyclic complexes , 1975 .

[3]  John L. Oscarson,et al.  The relationship between complex stability constants and rates of cation transport through liquid membranes by macrocyclic carriers , 1980 .

[4]  J. D. Lamb,et al.  STABILITY CONSTANTS OF CATION-MACROCYCLE COMPLEXES AND THEIR EFFECT ON FACILITATED MEMBRANE TRANSPORT RATES , 1981 .

[5]  John L. Oscarson,et al.  Liquid membrane separations of metal cations using macrocyclic carriers , 1981 .

[6]  T. Hamada,et al.  Separation of strontium-89 and -90 from calcium in milk with a macrocyclic ether. , 1979, Analytical chemistry.

[7]  R. D. Shannon,et al.  Effective ionic radii in oxides and fluorides , 1969 .

[8]  J. D. Lamb,et al.  Effects of salt concentration and anion on the rate of carrier facilitated transport of metal cations through bulk liquid membranes containing crown ethers , 1980 .

[9]  J. D. Lamb,et al.  Thermodynamics and Kinetics of Cation-Macrocycle Interaction , 1979 .

[10]  D. Eatough,et al.  The Synthesis and Ion Bindings of Synthetic Multidentate Macrocyclic Compounds. , 1974, Chemical reviews.

[11]  J. D. Lamb,et al.  A SYSTEMATIC STUDY OF THE EFFECT OF MACROCYCLE RING SIZE AND DONOR ATOM TYPE ON THE LOG K, ΔH, AND TΔS OF REACTIONS AT 25°C IN METHANOL OF MONO- AND DIVALENT CATIONS WITH CROWN ETHERS , 1980 .

[12]  J. Lehn,et al.  Cryptates: control over bivalent/monovalent cation selectivity , 1973 .

[13]  D. F. Evans,et al.  Membranes with common ion pumping , 1975 .

[14]  J. Lehn,et al.  Cation and cavity selectivities of alkali and alkaline-earth “cryptates” , 1971 .

[15]  J. D. Lamb,et al.  The influence of macrocyclic ligand structure on carrier-facilitated cation transport rates and selectivities through liquid membranes , 1981 .

[16]  J. D. Lamb,et al.  A systematic study of the effect of macrocycle ring size and donor atom type on the log K, .DELTA.H, and T.DELTA.S of reactions at 25.degree.C in methanol of mono- and divalent cations with crown ethers , 1980 .

[17]  Edward L Cussler,et al.  Selective membrane transport , 1973 .

[18]  R. E. Terry,et al.  Calorimetric titration study of the interaction of several uni- and bivalent cations with 15-crown-5, 18-crown-6, and two isomers of dicyclohexo-18-crown-6 in aqueous solution at 25.degree.C and .mu. = 0.1 , 1976 .