Collect. Czech. Chem. Commun. 1998, 63, 2001-2008

Extraction of Cesium with Bis[undecahydro-7,8-dicarbaundecaborato(2-)]cobaltate(1-) in the Presence of 18-Crown-6

Petr Vaňuraa and Emanuel Makrlíkb

a Department of Analytical Chemistry, Prague Institute of Chemical Technology, 166 28 Prague, Czech Republic
b Department of Chemistry, Faculty of Education, Charles University, 116 39 Prague, Czech Republic


Extraction of cesium with a nitrobenzene solution of bis[undecahydro-7,8-dicarbaundecaborato(2-)]cobaltate(1-) in the presence of 18-crown-6 (18C6, L) has been investigated. The equilibrium data and typical dependences of the Cs distribution ratios on the analytical concentration of 18C6 in the system under study can be explained assuming that the complexes HL+, CsL+ and CsL2+ are extracted into the organic phase. The values of extraction and stability constants of the species in nitrobenzene saturated with water have been determined.

Keywords: Water-nitrobenzene extraction system; Cesium; 18-Crown-6; Bis[undecahydro-7,8-dicarbaundecaborato(2-)]cobaltate(1-).