Synthesis of di-substituted calix[4]arene-based receptors for extraction of chromate and arsenate anions |
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Authors: | Mevlüt Bayrakc? ?eref Ertul |
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Institution: | a Selçuk University, Department of Chemistry, Campus, 42031 Konya, Turkey b Ni?de University, Department of Chemistry, Campus, 51100 Ni?de, Turkey |
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Abstract: | The article describes the synthesis of a family of novel calix4]arene ionophores, 25,27-bis-(2-aminomethylpyridine-propoxy)-26,28-dihydroxycalix4]arene (5a), 25,27-bis-(3-aminomethylpyridine-propoxy)-26,28-dihydroxycalix4]arene (5b) and two chromogenic calix4]arenes, 5,17-dinitro-25,27-bis-(2-aminomethylpyridine-propoxy)-26,28-dihydroxycalix4]arene (5c), 5,17-dinitro-25,27-bis-(3-aminomethylpyridine-propoxy)-26,28-dihydroxycalix4]arene (5d) bearing pyridinium units. In the synthesis, the upper and lower rims of p-tert-butylcalix4]arene were modified in order to acquire binding sites for the recognition of arsenate and dichromate anions. It has been observed that protonated alkylammonium forms of the ionophores showed high affinity toward dichromate and arsenate anions. |
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Keywords: | Calixarene Arsenate anion Chromate anion Proton-switchable Liquid-liquid extraction |
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