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  • Title: Relaxation study of complex formation between monovalent cations and cyclic polyethers.
    Author: Chock PB.
    Journal: Proc Natl Acad Sci U S A; 1972 Jul; 69(7):1939-42. PubMed ID: 4505671.
    Abstract:
    Equilibrium quotients for the 1:1 complexes of dibenzo-30-crown-10 with Na(+), K(+), Rb(+), Cs(+), NH(4) (+), and T1(+) in methanol solution have been determined spectrophotometrically. The observed selectivity pattern is discussed in terms of the hydration energy of the cations and the cation-ligand binding energy. The rate of complex formation is diffusion-controlled. Relaxation amplitude data are consistent with a mechanism that involves conformational change of the crown compound.
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