Cation fluxes from binary Ag/sup +/-M/sup n+/ mixtures in a H/sub 2/O-CHCl/sub 3/-H/sub 2/O liquid membrane system containing a series of macrocyclic ligand carriers

Journal Article · Tue Apr 05 23:00:00 EST 1983 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00345a017· OSTI ID:5684929

Izatt, R M; Dearden, D V; Brown, P R; Bradshaw, J S; Lamb, J D; Christensen, J J

Cation fluxes were determined for Ag/sup +/-M/sup n+/ binary cation mixtures in a H/sub 2/O-CHCl/sub 3/-H/sub 2/O liquid membrane system, using macrocyclic ligands as carries. Alkali metal, alkaline earth metal, Pb/sup 2 +/, and Tl/sup +/ cations served as M/sup n+/ in these experiments while macrocyclic polyether ligands having varying ring cavity radii, donor atom types, and substituents served as carriers. Correlations were found between relative cation transport rates and these ligand structural features as well as the equilibrium constant (K) for the formation of the various cation-macrocycle complexes. Selection of macrocycles having proper carrier cavity radii and appropriate combinations of oxygen with either nitrogen or sulfur donor atoms led to selective transport of Ag/sup +/ in preference to any of the other cations studied. Transport was also enhanced by certain aliphatic substituents on the macrocycles. The most effective macrocycles in transporting large quantities of Ag/sup +/ in the presence of M/sup n+/ were diketopyridino-18-crown-6(DKP18C6), diketopyridino-21-crown-7 (DKP21C7), 4-octoxydiketopyridino-18-crown-6 (ODKP18C6), and dicyclohexano-18-crown-6 (DC18C6). Silver ion was transported selectively by these ligands over all M/sup n+/ cations studied except in the cases of Pb/sup 2 +/, which was transported in preference to Ag/sup +/ by DKP18C6, ODKP18C6, DC18C6; Tl/sup +/, which was transported preferentially by DKP21C7 and DC18C6; and Ba/sup 2 +/ and Sr/sup 2 +/, which were transported selectively by DC18C6.

• Research Organization: Brigham Young Univ., Provo, UT
• DOE Contract Number: AC02-78ER05016
• OSTI ID: 5684929
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 105:7; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
ALKALINE EARTH METALS
AZINES
BARIUM
CATIONS
CHARGED PARTICLES
COMPLEXES
ELEMENTS
EQUILIBRIUM
HETEROCYCLIC COMPOUNDS
IONS
KETONES
LEAD
LIGANDS
MEMBRANE TRANSPORT
MEMBRANES
METALS
NITROGEN
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN
PYRIDINES
SILVER COMPLEXES
STRONTIUM
SULFUR
THALLIUM
TRANSITION ELEMENT COMPLEXES