Complexation of the cesium cation with 1,3-alternate-25,27-bis(1-octyloxy)calix[4]arene-crown-6

0388254 - ÚMCH 2013 RIV HU eng J - Journal Article
Makrlík, E. - Dybal, Jiří - Vaňura, P.
Complexation of the cesium cation with 1,3-alternate-25,27-bis(1-octyloxy)calix[4]arene-crown-6.
Journal of Radioanalytical and Nuclear Chemistry. Roč. 295, č. 2 (2013), s. 1299-1303. ISSN 0236-5731. E-ISSN 1588-2780
R&D Projects: GA ČR GA203/09/1478
Institutional research plan: CEZ:AV0Z40500505
Institutional support: RVO:61389013
Keywords : cesium cation * substituted calix[4]arene-crown-6 * complexation
Subject RIV: CD - Macromolecular Chemistry
Impact factor: 1.415, year: 2013

From extraction experiments and γ-activity measurements, the extraction constant corresponding to the equilibrium Cs+(aq) + I−(aq) + 1(nb) "reversible arrow" 1.Cs+(nb) + I−(nb) taking place in the two–phase water–nitrobenzene system (1 = 1,3-alternate-25,27-bis(1-octyloxy)calix[4]arene-crown-6; aq = aqueous phase, nb = nitrobenzene phase) was evaluated as log Kex (1.Cs+, I−) = 2.9 ± 0.1. Further, the stability constant of the 1•Cs+ complex in nitrobenzene saturated with water was calculated for a temperature of 25 °C: log βnb (1•Cs+) = 8.8 ± 0.1. Finally, by using quantum–mechanical DFT calculations, the most probable structure of the resulting cationic complex species 1.Cs+ was derived.
Permanent Link: http://hdl.handle.net/11104/0217574