A sinapic acid–calix[4]arene hybrid selectively binds Pb2+ over Hg2+ and Cd2+

Article


Sgarlata, Carmelo, Zito, Valeria, Arena, Giuseppe, Consoli, Grazia Maria Letizia, Galante, E. and Geraci, Corrada 2009. A sinapic acid–calix[4]arene hybrid selectively binds Pb2+ over Hg2+ and Cd2+. Polyhedron. 28 (2), pp. 343-348. https://doi.org/10.1016/j.poly.2008.10.068
AuthorsSgarlata, Carmelo, Zito, Valeria, Arena, Giuseppe, Consoli, Grazia Maria Letizia, Galante, E. and Geraci, Corrada
Abstract

The binding affinity for Pb2+, Cd2+ and Hg2+ of the sinapic acid–calix[4]arene hybrid 2, having four sinapyl pendants at the upper rim, has been investigated via an UV–Vis study. Compound 2 has better complexing ability than the monomeric p-phenetidine derivative 1. This highlights that the clustering of sinapyl units in a basket-like structure, dictated by the calixarene scaffold, greatly enhances the complexing properties. Ligand 2 forms complexes even with Hg2+, which is not complexed by 1 at all; the complexes formed by 2 with Pb2+ and Cd2+ are much stronger than the analogous complexes formed by 1. The UV–Vis investigation shows that the hybrid 2 markedly favors Pb2+ over Cd2+ and Hg2+. Information on the structural properties of the complex species was obtained by 1H NMR spectroscopy. NMR data show that all three metal ions are placed into the cavity consisting of the calixarene scaffold and the sinapyl pendants, though their binding affects the coordinating regions to a different extent.

JournalPolyhedron
Journal citation28 (2), pp. 343-348
ISSN02775387
Year2009
PublisherElsevier
Digital Object Identifier (DOI)https://doi.org/10.1016/j.poly.2008.10.068
Web address (URL)https://doi.org/10.1016/j.poly.2008.10.068
Publication dates
Print03 Feb 2009
Publication process dates
Deposited18 Aug 2017
Accepted20 Oct 2008
Copyright information© Elsevier 2009
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