Study by fluorescence of calix[4]arenes bearing heterocycles with anions: Highly selective detection of iodide

Abstract

© Springer Science+Business Media Dordrecht 2014. The present work describes a study of complexation efficiency of calix[4]arenes bearing benzoimidazolyl, benzothiazolyl, and benzoxazolyl heterocycles (5-7) towards several anions. The binding ability of calixarene derivatives 5-7 towards selected anions of different molecular geometries such as: F<sup>-</sup>, HSO<inf>4</inf><sup>-</sup>, I<sup>-</sup>, N<inf>3</inf><sup>-</sup>, NO<inf>3</inf><sup>-</sup>, NO<inf>2</inf><sup>-</sup>, SCN<sup>-</sup>, ClO<inf>4</inf><sup>-</sup>, Br<sup>-</sup>, CN<sup>-</sup>, Cl<sup>-</sup>, CH<inf>3</inf>COO<sup>-</sup> CF<inf>3</inf>SO<inf>3</inf><sup>-</sup> in methanol, has been investigated by fluorescence spectroscopic techniques, all anions were used as tetrabutylammonium salts to avoid possible complexation of cationic species by the derivative calix[4]arenes. Fluorescent chemosensor ability of these three calixarene derivatives was highly selective for iodide in contrast with other anions st