Abstract
The stability constants of the potassium complex with dibenzo-30-crown-10 have been determined from potentiometric or solubility measurements in the solvents: methanol, iso-propanol, n-butanol, propylene carbonate, acetonitrile and dimethylsulfoxide. The solubility of the ligand in these solvents has also been determined and the transfer activity coefficients of the potassium complex for transfer from methanol to solvent (S), γS←M(KL+), have been computed. Although solid state studies indicate that dibenzo-30-crown-10 completely surrounds the potassium ion and shields it from water, the transfer activity coefficient of the potassium complex is found to be highly solvent dependent. Dibenzo-30-crown-10 is thus less effective for the removal of the solvation sphere of the potassium ion than previously estimated.
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Massaux, J., Roland, G. & Desreux, J.F. Solvation of the potassium ion complexed with dibenzo-30-crown-10. Transfer activity coefficients between methanol and various solvents. J Solution Chem 11, 549–555 (1982). https://doi.org/10.1007/BF00649255
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DOI: https://doi.org/10.1007/BF00649255