Complexation of the cesium cation with nonactin: extraction and DFT study

被引：12
|
作者：
Makrlik, E. [1 ]
Toman, P. [2 ]
Vanura, P. [3 ]
机构：
[1] Czech Univ Life Sci, Fac Environm Sci, Prague 16521 6, Czech Republic
[2] Acad Sci Czech Republ, Inst Macromol Chem, CR-16206 Prague 6, Czech Republic
[3] Prague Inst Chem Technol, Dept Analyt Chem, CR-16628 Prague 6, Czech Republic
来源：
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY | 2013年 / 295卷 / 01期
关键词：
Cesium; Nonactin; Complexation; Water-nitrobenzene system; Extraction and stability constants; DFT calculations; Complex structure; STOFFWECHSELPRODUKTE VON ACTINOMYCETEN; BILAYER-LIPID MEMBRANE; UBER DIE KONSTITUTION; ION-TRANSPORT; HYDRONIUM ION; NMR; NITROBENZENE; VALINOMYCIN; CONSTANTS; ANTIBIOTICS;
D O I：
10.1007/s10967-012-1871-2
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
From extraction experiments and gamma-activity measurements, the extraction constant corresponding to the equilibrium Cs+(aq) + A(-)(aq) + 1(nb) a double dagger" 1 center dot Cs+(nb) + A(-)(nb) taking place in the two-phase water-nitrobenzene system (A(-) = picrate, 1 = nonactin; aq = aqueous phase, nb = nitrobenzene phase) was evaluated as log K (ex) (1 center dot Cs+,A(-)) = 2.8 +/- A 0.1. Further, the stability constant of the 1 center dot Cs+ complex in nitrobenzene saturated with water was calculated for a temperature of 25 A degrees C: log beta (nb) (1 center dot Cs+) = 4.7 +/- A 0.1. Finally, by using quantum-mechanical DFT calculations, the most probable structure of the resulting cationic complex species 1 center dot Cs+ was derived.
引用
收藏
页码：615 / 619
页数：5
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