Abstract
In the solid and solution state Li+ and Na+ form inclusive and exclusive cryptates respectively with C21C5, in which Li+ resides inside and Na+ resides outside the C21C5 cavity. Similar inclusive and exclusive structures are observed for [Li.C211]+ and [Na. C211]+. The logarithms of the stability constants in dimethylformamide for [Li.C21C5]+, [Li.C211]+, [Na.C21C5]+ and [Na.C211]+ are: 2.80, 6.99, 2.87 and 5.20; ando the corresponding decomplexation rate constants are: 107, 0.013, 28800 and 12 s−1 at 298.2 K. The relationships between cryptate structure, stability and lability are considered, as are solvent influences.
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Abou-Hamdan, A., Brereton, I.M., Hounslow, A.M. et al. An equilibrium and kinetic study of the complexation of lithium and sodium ions by the cryptand 4, 7, 13-trioxa-1, 10-diazabicyclo-[8. 5. 5]-eicosane (C21C5). Journal of Inclusion Phenomena 5, 137–141 (1987). https://doi.org/10.1007/BF00655636
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DOI: https://doi.org/10.1007/BF00655636