Complex forming and extraction properties of oligo benzo-fused crown ethers |
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| Authors: | Olaf Heitzsch Karsten Gloe Alfréd Sabela Jiří Koryta Edwin Weber |
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| Affiliation: | (1) Institut für Festkörper- und Werkstoffforschung Dresden, 0-8027 Dresden, Germany;(2) J. Heyrovsky Institute of Physical Chemistry and Electrochemistry, CS-18223 Praha 8, Czechoslovakia;(3) Institute of Physiology, CS-14220 Praha 4, Czechoslovakia;(4) Institut für Organische Chemie und Biochemie der Universität Bonn, W-5300 Bonn, Germany |
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| Abstract: | The complex forming properties with alkali metal and ammonium ions of a series of oligo benzo-condensed 18-crown-6 ethers1–8 having a different gradation of lipophilicity and of molecular rigidity are investigated by voltammetry at the interface of two immiscible electrolyte solutions (ITIES) and by a liquid-liquid extraction technique. The experimental results obtained in the two phase system H2O/nitrobenzene are discussed in relation to the structure of the crown and the cation type. The stability constants for the 1 : 1 complexes of Na+, K+, Rb+, Cs+ and NH4+ in nitrobenzene have been determined and compared with the extraction constants for the 1: 1 complexes of Na+ and K+ and for the 1 : 1 and 1 : 2 complexes of Cs+, showing the effect of oligo benzo condensation for the 18-crown-6 system. |
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| Keywords: | Crown ethers liquid-liquid extraction voltammetry stability constants |
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