Mobilities of cation-macrocyclic ligand complexes

Salomon, M. and Hefter, G.T. (1993) Mobilities of cation-macrocyclic ligand complexes. Pure and Applied Chemistry, 65 (7). pp. 1533-1540.

Abstract

Formation constants for complexion between alkali metal cations and the crown ether 18C6 in the solvent 2-cyanopyridine at 3OoC were determined from conductance measurements. The method allows for precise determination of these formation constants up to values of Kf .a round 10" mol-' dm3. The method also permits accurate evaluation of association equilibrium constants between the complex species (M-18C6)' and the anion. The magnitudes of these ion association constants are related to the nature of the solvation of the cation and of the complexed cation. The mobilities of the complexes are also dependent, in part, upon solvation effects. In 2-cyanopyridine the single ion molar conductance of the (Li-18C6)' complex is greater than that of the uncomplexed cation. Similar behavior is observed for alkali metal complexes with 18C6 and the cryptand 222 in other solvents such as propylene carbonate and propylene carbonate mixtures with dichloromethane.

Publication Type:	Journal Article
Murdoch Affiliation:	School of Mathematical and Physical Sciences
Publisher:	International Union of Pure and Applied Chemistry
Copyright:	@ 1993 IUPAC
URI:	http://researchrepository.murdoch.edu.au/id/eprint/1536

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