Heavy metal complexation by N-acyl(thio)urea-funtionalized cavitand: synthesis, extraction and potentiometric studies

Reinoso-Garcia, Marta M. and Verboom, Willem and Reinhoudt, David N. and Malinowska, Elz˙bieta and Pietrzak, Mariusz and Wojciechowska, Dorota (2005) Heavy metal complexation by N-acyl(thio)urea-funtionalized cavitand: synthesis, extraction and potentiometric studies. Tetrahedron, 60 (49). pp. 11299-11306. ISSN 0040-4020

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Abstract:	The synthesis and binding properties of resorcinarene-based cavitands functionalized with N-acylthiourea moieties towards different cations are described. Extraction studies with metal (Pb2+, Cu2+, Ag+, Hg2+, Cd2+, Eu3+, Fe3+, K+, Na+, and Ca2+) picrates and the incorporation in ion selective electrodes (ISEs), show that there is more than a 40% increase of the Ag+ extraction for N-acylthiourea ionophores (2, 3, and 8) in comparison with N-benzoyl-N′-benzylthiourea (9). Ionophore 8, which has a C3 chain between the platform and the ionophore, extracts two times more Cu2+ than the more rigid one (2). Stoichiometry studies showed for ligand 2 a ligand/metal ratio of 1:1, while for model compound 9 a ratio of 1:2 was found. Potentiometric studies of electrodes revealed that cavitands 2, 3, and 8 induce a significantly different selectivity pattern compared to the cation-exchanger used, as well as model compound 9. Especially, a considerable enhancement of the selectivity towards Ag+ and Pb2+ over K+, Ca2+, and Na2+ ions was observed.
Item Type:	Article
Copyright:	© 2004 Elsevier
Faculty:	Science and Technology (TNW)
Research Group:	Molecular Nanofabrication (MNF)
Link to this item:	http://purl.utwente.nl/publications/49584
Official URL:	http://dx.doi.org/10.1016/j.tet.2004.08.044
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Metis ID: 222206