Extraction and theoretical study on the complexation of the strontium cation with beauvericin

0388249 - ÚMCH 2013 RIV HU eng J - Journal Article
Makrlík, E. - Toman, Petr - Vaňura, P.
Extraction and theoretical study on the complexation of the strontium cation with beauvericin.
Journal of Radioanalytical and Nuclear Chemistry. Roč. 295, č. 2 (2013), s. 1119-1122. ISSN 0236-5731. E-ISSN 1588-2780
R&D Projects: GA ČR(CZ) GAP205/10/2280
Institutional research plan: CEZ:AV0Z40500505
Institutional support: RVO:61389013
Keywords : strontium cation * beauvericin * complexation
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.415, year: 2013

From extraction experiments and γ-activity measurements, the extraction constant corresponding to the equilibrium Sr2+(aq) + 2A–(aq) +1(nb) reversible arrow 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 Kex(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 βnb(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.
Permanent Link: http://hdl.handle.net/11104/0217575