Calix[4]arenes containing thiourea and amide moieties: neutral receptors towards alpha,omega-dicarboxylate anions |
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Authors: | Liu Shun-Ying He Yong-Bing Wu Jin-Long Wei Lan-Hua Qin Hai-Juan Meng Ling-Zhi Hu Ling |
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Institution: | Department of Chemistry, Wuhan University, Wuhan, Hubei 430072, PR China. |
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Abstract: | Two-armed neutral anion receptors (4,5), were prepared and examined for their anion-binding ability using UV-vis, fluorescence and 1H NMR spectra in DMSO. The results of non-linear curve fitting indicate that 4 or 5 form 1 : 1 stoichiometric complexes with dicarboxylate anions by multiple hydrogen bonding interactions and the sensitivity for recognition of dicarboxylate depends on the chain length of these dicarboxylate anions. Receptors 4 and 5 have no binding ability with acetate, dihydrogen phosphate and the halogen (Cl-, Br-, I-) anions. This demonstrates that receptors 4 or 5 could be used as chemical sensors for some special dicarboxylate anions. |
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