Abstract
Protolytic properties of holmium tetraphenylporphyrinchloride were studied by the method of two-phase spectrophotometric titration with potentiometric monitoring of pH of the medium. Apparent constants of the heterophase reaction of the exchange of an anion for the hydroxide ion were determined. It was found that the membranes based on holmium tetraphenylporphyrinchloride with dibutyl phthalate as a solvent-softener are selective to ions of alkaline earth metals (Ca2+ and Ba2+) in the region of pH > 7 over the concentration range from 1 up to 1×10−4 M. Selectivity coefficients were determined by two independent methods: the method of biion potentials and the method of mixed solutions. The found selectivity series coincides with traditional Hofmeister series for cations.
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Original Russian Text © A.B. Valiotti, O.E. Vasil’eva, T.A. Starikova, A.S. Semeikin, G.I. Shumilova, 2011, published in Zhurnal Obshchei Khimii, 2011, Vol. 81, No. 4, pp. 672–677.
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Valiotti, A.B., Vasil’eva, O.E., Starikova, T.A. et al. Electrochemical properties and spectrophotometry of membranes based on holmium tetraphenylporphyrinchloride. Russ J Gen Chem 81, 762–767 (2011). https://doi.org/10.1134/S1070363211040256
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DOI: https://doi.org/10.1134/S1070363211040256