The co-ordination of alkaline-earth and lanthanide metal cations by a cryptand containing the ferrocene unit has been examined by cyclic voltammetry; the data are used to deduce values of K2 for the association of oxidised cryptand (1+) with this range of metal cations and a linear correlation between ln K2 and the ratio of ionic radius/ionic charge is reported.
C. D. Hall, N. W. Sharpe, I. P. Danks and Y. P. Sang, J. Chem. Soc., Chem. Commun., 1989, 419 DOI: 10.1039/C39890000419
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