Abstract
On the basis of extraction experiments in the two-phase water–nitrobenzene system and γ-activity measurements, we determined the stability constant of the cyclosporin A–Ba2+ cationic complex dissolved in nitrobenzene saturated with water as 109.1 ± 0.2. Using quantum mechanical calculations, the most probable structure of this complex species was derived. In the resulting complex, the “central” cation Ba2+ is bound by six bonds to the respective six carbonyl oxygen atoms of the parent cyclosporin A ligand. The interaction energy of this proven cationic complex was found to be −769.5 kJ mol−1, confirming also the formation of the mentioned complex species.
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This work was supported by the Grant Agency of the Faculty of Environmental Sciences, Czech University of Life Sciences, Prague, Project No. 42900/1312/3114, entitled “Environmental Aspects of Sustainable Development of Society”, and by the Czech Ministry of Education, Youth, and Sports (Project MSMT No.: 20/2015).
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Makrlík, E., Böhm, S. & Vaňura, P. Complexation of the barium cation with cyclosporin A: an experimental and theoretical study. Monatsh Chem 147, 1475–1479 (2016). https://doi.org/10.1007/s00706-016-1769-8
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DOI: https://doi.org/10.1007/s00706-016-1769-8