Complex formation of O-carboxymethylcalix[4]resorcinolarene with alkaline metal and ammonium ions |
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| Authors: | Pod"yachev S N Mustafina A R Habicher W D |
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| Institution: | (1) A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Research Center of the Russian Academy of Sciences, 8 ul. Akad. Arbuzova, 420088 Kazan, Russian Federation;(2) Institute of Organic Chemistry, Drezden University of Technology, 13 Mommsenstrasse, D-01062 Drezden, Germany |
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| Abstract: | Complex formation of 3,5,10,12,17,19,24,26-octa(carboxymethoxy)-1,8,15,22-tetraundecylcalix4]arene (H8X) with Li+, Na+, K+, and NH4
+ ions was studied by 1H NMR spectroscopy and pH-metry in water—DMSO solutions. Binding of one cation occurs during the stepped deprotonation of four carboxymethyl groups in H8X. The K+ ion was found to be bound more efficiently than Li+ and Na+. The further deprotonation to the penta- and hexaanion leads to the coordination with two cations. The most stable binuclear complex is formed with the Li+ ion. |
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| Keywords: | calix[4]resorcinolarene complexes alkaline metals stability constants pH-metry |
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