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Monatshefte für Chemie - Chemical Monthly

, Volume 139, Issue 6, pp 597–600 | Cite as

Experimental evidences for some unusual divalent cation complexes of valinomycin

  • Emanuel Makrlík
  • Petr Vaňura
  • Pavel Selucký
Article

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+.

Keywords

Antibiotics; Macrocycles; Complexation; Stability constants; Valinomycin. 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Emanuel Makrlík
    • 1
  • Petr Vaňura
    • 2
  • Pavel Selucký
    • 3
  1. 1.Faculty of Applied SciencesUniversity of West BohemiaPilsenCzech Republic
  2. 2.Institute of Chemical TechnologyPragueCzech Republic
  3. 3.Nuclear Research InstituteŘežCzech Republic

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