Abstract
Cesium complexes with four diazapolyoxamacrobicyclic ligands ([2]-cryptands), C211, C221, C222, and C222B, were investigated in pyridine, acetone, propylene carbonate, N,N-dimethylformamide, acetonitrile, and dimethyl sulfoxide solutions by cesium-133 NMR. The relative stabilities of the complexes are in the order Cs+·C221≥Cs+·C222>Cs+·C222B≫Cs+·C211. The formation constants are strongly influenced by the solvating abilities of the solvents. The NMR data and stereochemical considerations indicate that in the C222−Cs+ system there is an equilibrium between “exclusive” and “inclusive” conformations of the complex. The other three ligands must form only the “exclusive” complex.
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Mei, E., Liu, L., Dye, J.L. et al. Determination of stability constants of cesium [2]-cryptand complexes in nonaqueous solvents by cesium-133 NMR. J Solution Chem 6, 771–778 (1977). https://doi.org/10.1007/BF00650453
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DOI: https://doi.org/10.1007/BF00650453