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Experimental evidences for some unusual divalent cation complexes of valinomycin

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Abstract

From extraction experiments and γ-activity measurements, the exchange extraction constants corresponding to the general equilibrium M 2+ (aq) + 1 · Sr2+ (nb) ⇄ 1 · M 2+ (nb) + Sr2+ (aq) taking place in the two-phase water-nitrobenzene system (M 2+ = Cu2+, Zn2+, Cd2+, Pb2+, UO2 2+, Fe2+, Co2+, and Ni2+; 1 = valinomycin; aq = aqueous phase, nb = nitrobenzene phase) were evaluated. Moreover, the stability constants of the 1 · M 2+ complexes in water saturated nitrobenzene were calculated; they were found to increase in the order Fe2+ < Cd2+, Co2+ < Ni2+ < UO2 2+, Zn2+ < Cu2+ < Pb2+.

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Authors and Affiliations

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

    Emanuel Makrlík

  2. Institute of Chemical Technology, Prague, Czech Republic

    Petr Vaňura

  3. Nuclear Research Institute, Řež, Czech Republic

    Pavel Selucký

Authors
  1. Emanuel Makrlík
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  2. Petr Vaňura
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  3. Pavel Selucký
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Corresponding author

Correspondence to Emanuel Makrlík.

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Correspondence: Emanuel Makrlík, Faculty of Applied Sciences, University of West Bohemia, Pilsen, Czech Republic.

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Makrlík, E., Vaňura, P. & Selucký, P. Experimental evidences for some unusual divalent cation complexes of valinomycin. Monatsh Chem 139, 597–600 (2008). https://doi.org/10.1007/s00706-007-0816-x

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  • DOI: https://doi.org/10.1007/s00706-007-0816-x

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