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The complexation of sodium tetraphenylborate by poly(2‐methoxy‐2‐oxo‐1,3,2‐dioxaphospholane) and by poly(2‐methoxy‐2‐oxo‐1,3,2‐dioxaphosphorinane) in methanol solutions was studied using a previously derived relationship between solution composition and the width of a 23Na NMR signal. The results indicate that the equilibrium constants of complexation of sodium cations by both phosphoric‐ester polymers are of the same order of magnitude as the corresponding equilibrium constants of complexation of sodium cations by poly(oxyethylene).
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Szymański et al. (1993) studied this question.
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