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Experimental Evidence for a Valinomycin – Proton Complex

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Summary.

From extraction experiments and γ-activity measurements, the extraction constant corresponding to the equilibrium H+ (aq) + NaL+ (nb) = HL+ (nb) + Na+ (aq) taking place in the two-phase water-nitrobenzene system (L = valinomycin, aq = aqueous phase, nb = nitrobenzene phase) was evaluated as log Kex (H+, NaL+) = −1.1 ± 0.1. Further, the stability constant of the valinomycin-proton complex in nitrobenzene saturated with water was calculated as log βnb(HL+) = 5.3 ± 0.1. Finally, the stability constants of complexes of some univalent cations with valinomycin were summarized and discussed.

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Authors and Affiliations

  1. Faculty of Applied Sciences, University of West Bohemia, 306 14, Pilsen, Czech Republic

    Emanuel Makrlík

  2. Prague Institute of Chemical Technology, Prague 6, 166 28, Czech Republic

    Petr Vaňura

Authors
  1. Emanuel Makrlík
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  2. Petr Vaňura
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Correspondence to Petr Vaňura.

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Makrlík, E., Vaňura, P. Experimental Evidence for a Valinomycin – Proton Complex. Monatsh. Chem. 137, 157–161 (2006). https://doi.org/10.1007/s00706-005-0422-8

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  • DOI: https://doi.org/10.1007/s00706-005-0422-8

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