Abstract
The aqueous protonation and anion-binding SeO −/42 SO 42− , and NO 3− ) constants of the macrocyclic polyamine ligand, dipyridino-hexaaza-28-crown-8(L), were measured in 0.1M KCl using a potentiometric titration technique. The protonation sequence of the aza groups of L was studied in D2O from the chemical shifts of the nonlabile protons so as to find the charge distribution geometry as a function of pD. The study indicates that in 0.1M KC1 fully protonated L forms stable l: 1 complexes with SeO 42− (logK=3.68) and SO 42− (logK=3.55), but not with NO 3− (logK < l.5). All of the amine pK values were above 6.3, thus allowing the use of the protonated form of this ligand over a wide pH range.
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Wu, G., Izatt, R.M., Bruening, M.L. et al. NMR and potentiometric determination of the high pK values and protonation sequence of dipyridino-hexaaza-28-crown-8 and its interactions with selenate, sulfate and nitrate ions in aqueous solution. J Incl Phenom Macrocycl Chem 13, 121–127 (1992). https://doi.org/10.1007/BF01053635
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DOI: https://doi.org/10.1007/BF01053635