Spectroscopic study of the complexation of benzo-15-crown-5 and dibenzo-30-crown-10 with sodium and potassium ions in binary acetonitrile-water mixture
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Add time:07/21/2019 Source:sciencedirect.com
The interaction between Na+ and K+ ions and benzo-15-crown-5 and dibenzo-30-crown-10 in CH3− CNH2O mixtures has been studied spectrophotometrically, at 25 °C and at ionic strength of 0.015. The formation constants for 1:1 complexes at different weight percentages of acetonitrile in water were determined. In all solvent mixtures used, the stabilities of the complexes vary in the order DB30C10-K+ > B15C5-K+ > B15C5-Na+. A linear relationship is observed between log Kf of the three complexes and the mole fraction of acetonitrile. The solvent dependence of the stability constants is most notable with B15C5-K+ and the least with DB30C10-K+ complex.
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