Abstract
From extraction experiments and γ-activity measurements, the extraction constant corresponding to the equilibrium Sr2+(aq) + 2A−(aq) +1(nb) ⇔ 1·Sr2+(nb) + 2A−(nb) taking place in the two-phase water–nitrobenzene system (A− = picrate, 1 = beauvericin; aq = aqueous phase, nb = nitrobenzene phase) was evaluated as log K ex(1·Sr2+,2A−) = −0.6 ± 0.1. Further, the stability constant of the 1·Sr2+ complex in nitrobenzene saturated with water was calculated for a temperature of 25 °C: log β nb(1·Sr2+) = 8.5 ± 0.1. Finally, by using quantum-mechanical DFT calculations, the most probable structure of the resulting cationic complex 1·Sr2+ was derived.
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Acknowledgments
This work was supported by the Grant Agency of Faculty of Environmental Sciences, Czech University of Life Sciences, Prague, Project No.: 42900/1312/3114 “Environmental Aspects of Sustainable Development of Society”, by the Czech Ministry of Education, Youth, and Sports (Project MSM 6046137307), and by the Czech Science Foundation (Project P205/10/2280). The computer time at the MetaCentrum (Project LM 2010005), as well as at the Institute of Physics (computer Luna/Apollo), Academy of Sciences of the Czech Republic, is gratefully acknowledged.
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Makrlík, E., Toman, P. & Vaňura, P. Extraction and theoretical study on the complexation of the strontium cation with beauvericin. J Radioanal Nucl Chem 295, 1119–1122 (2013). https://doi.org/10.1007/s10967-012-1886-8
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DOI: https://doi.org/10.1007/s10967-012-1886-8