Extraktion von alkali- und erdalkalimetallionen mit (sym-dibenzo-14-krone-4-oxy)- und (sym-dibenzo-16-krone-5-oxy)-carbonsäuren |
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| Authors: | E Uhlemann H Bukowsky F Dietrich K Gloe P Mühl H Mosler |
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| Institution: | Pädagogische Hochschule “Karl Liebknecht”, DDR-1571 Potsdam Deutsche Demokratische Republik;Akademie der Wissenschaften der DDR, Zentralinstitut für Festkörperphysik und Werkstofforschung, DDR-8027 Dresden Deutsche Demokratische Republik;VEB Erdgasförderung “Karl Marx”, DDR-3560 Salzwedel Deutsche Demokratische Republik |
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| Abstract: | (Extraction of alkali on alkaline earth metal ions with (sym-dibenzo-14-crown-4-oxy)- and (sym-dibenzo-16-crown-5-oxy)-carboxylic acids.)The extraction of lithium, sodium, potassium, calcium and some other metal ions with dibenzo-4-crown-4-oxy- and dibenzo-16-crown-5-oxycarboxylic acids containing the groups -CH2COOH, -(CH2)2COOH, -(CH2)3COOH, -CH(C2H5)COOH and -CH(C4H9)COOH was studied. The extraction increases as a function of the lipophilic character of the carboxylic acid group. Calcium, barium and strontium ions are better extracted than Li+, Na+ and K+; there are only small differences among the alkaline earth metal ions. Evaluated from the extraction data, the composition of the extracted species was 1:1 (metal/ligand) for Li+, and 1:2 for CaCa2+; Na+ and K+ favour the formation of 1:2 complexes with dibenzo-14-crown-4-derivatives bbut 1:1 complexes with dibenzo-16-crown-5-oxy-carboxylic acids. The dependence of the distribution ratio on pH does not provide unequivocal evidence for the composition of the extracted compounds. |
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