Lower rim substituted p-tert-butyl-calix[4]arene. Part 16. Synthesis of 25,26,27,28-tetrakis(piperidinylthiocarbonylmethylene)-p-tert-butylcalix[4]arene and its interaction with metal ions |
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Authors: | Joanna Kulesza Marcin GuzinskiVeronique Hubscher-Bruder Francoise Arnaud-NeuMaria Bocheńska |
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Affiliation: | a Department of Chemical Technology, Faculty of Chemistry, Gdansk University of Technology, Narutowicza Street 11/12, 80-233 Gdansk, Poland b Laboratoire de Chimie-Physique, IPHC-DSA, UDS, CNRS, ECPM 25, Rue Becquerel, 67087 Strasbourg Cedex 2, France |
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Abstract: | The synthesis, characterisation and X-ray crystal structures of p-tert-butyl-calix[4]arene-thioamide L and its complex with lead L-Pb2+ is reported. The cation-binding properties in solution have been assessed by liquid-liquid extraction of the metal picrates from water into dichloromethane and by stability constants determination in acetonitrile using UV-absorption spectrophotometry or potentiometry. The compound was used as active material in Pb-ion-selective membrane electrodes. The characteristics of these electrodes as well as the selectivity coefficients for Pb2+ cation versus many metal ions tested were obtained. Complex formation constants within the electrode membranes were determined using the sandwich membrane method and were compared to those obtained in acetonitrile. The lead concentration in the scrap-lead was determined with the use of electrodes incorporating the ligand studied. |
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Keywords: | Calix[4]arene-thioamide X-ray crystal structures Pb2+-selective electrodes Selectivity coefficients Complex stability constants determination Liquid-liquid extraction |
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