Unusual stoichiometry of urea-derivatized calix[4]arenes induced by anion complexation |
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| Authors: | Kamil Lang Petra Cu?ínová Petra Prošková Václav Št’astný |
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| Institution: | a Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 ?e?, Czech Republic
b Department of Organic Chemistry, Prague Institute of Chemical Technology, Technická 5, 166 28 Prague 6, Czech Republic |
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| Abstract: | Calix4]arenes bearing two p-nitrophenyl-ureido functions at the upper rim are effective anion binders. The stoichiometry of complexation depends on the substitution pattern (distal vs proximal) and anion concentration. While the distally substituted receptor forms 1:1 complexes with anions, the corresponding proximal derivative prefers the 2:1 stoichiometry (calixarene:anion) under identical conditions. |
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| Keywords: | Calixarene Anion complexation Dimerization Receptor |
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