Journal
TETRAHEDRON LETTERS
Volume 49, Issue 27, Pages 4227-4230Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2008.04.155
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A new thiacalix[4]arene derivative 2 of 1,3-alternate conformation possessing two pyrene groups has been synthesized and examined for its cation recognition abilities towards different cations such as lithium, sodium, potassium, nickel, zinc, cadmium, silver, mercury, lead and copper by fluorescence spectroscopy. In CH3CN/CH2Cl2 (1:1), the presence of Cu(II) induces the formation of a 1:2 ligand/metal complex, which exhibits increasing monomer emission at 376 nm at the expense of the fluorescent excimer emission of 2 centered at 476 nm. In the presence of K-,(+) the intensity of the excimer emission increases along with the formation of a new blue shifted band at 435 nm which corresponds to a static dinner. The compound behaves as a fluorescent molecular switch upon chemical input of Cu2+ and K+. (C) 2008 Elsevier Ltd. All rights reserved.
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