Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 1141, Issue -, Pages 133-141Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molstruc.2017.03.089
Keywords
Calix[4]arene; Thiourea; Benzothiazole; Fluoride; Cadmium
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Funding
- FONDECYT [1151310, 1160249]
- CONICYT [24121408, 21130501, 21130502]
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A new calix[4]arene thiourea derivative bearing a benzothiazolyl moiety (L) was synthetized and characterized by single crystal X-ray, NMR and ESI-TOF. The binding ability of the bifunctional receptor towards several ions was investigated in acetonitrile by means of UV-Visible and NMR spectroscopy. The UV-Vis studies of receptor L demonstrated a stoichiometry of 1:1 for all ions studied. Also, recognize selectively F- and Cd2+ with a detection limit of 97 and 37 mu M, respectively. Also, H-1 NMR titration of receptor L indicated that both thiourea bridge and phenolic hydroxyl functional groups played a critical role in the binding of F- and Cd2+ ions. H-1 NMR spectrum showed that receptor L has a flattened-cone conformation in solution that changes to a cone conformation in the presence of fluoride while cadmium maintained the initial conformation. (C) 2017 Elsevier B.V. All rights reserved.
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